Luca Deseri, Ph.D.  Biosketch
·
Luca Deseri is Professor
of Solid
and Structural Mechanics at the University of Trento in Italy.
·
He also
holds two positions in the USA as (i) Research
Professor of Mechanical Engineering and Materials Science at the Dept. MEMSUniversity of Pittsburgh (effective
2016) and (ii) Adjunct Professor of Mechanics in the Dept. of Civil and
Environmental Engineering And in the dept. of Mechanical Engineering at Carnegie Mellon University, Pittsburgh PAUSA.
·
Luca has
just been appointed “Divisional
lead and Professor of Aerospace Engineering” by Brunel University London, and he will start his duties in the UK in July 2016.
Luca earned his Ph.D. in Applied Mechanics
and Structural Analysis from the University of Pisa, while spending a year at
Carnegie Mellon, where he subsequently did his postdoc. He was appointed
assistant and then associate professor at the University of Ferrara. He moved
to the University of Molise as full professor and deputy dean of Engineering.
Subsequently, he became dept. head of Mechanical & Structural Engineering
at the University of Trento (ranked first nationwide 12 times in the last 16
years). Luca just completed his term at the Italian directorate of Solid and
Structural Mechanics and three terms as the leader of the local IUTAM society
of Mechanics of Materials. He is panel member of the SNP, Society for Natural
Philosophy.
Luca is the only non US scientist nominated for the
election of the new Board of Director of the SESSociety for Engineering
Sciences.
He is associate editor of Frontiers, sect. of
Mechanics of Materials (Nature publisher, Lausanne), he is on the editorial
board of: Journal of Nanomaterials, International
Journal of Medical Nano Research, Journal of NanoMedicine
and Application, and Mathematical Problems in Engineering. He is reviewer for
several major journals, such as Nature Comm., Biomech.
Modeling Mechanobiol., J. Mech. Phys. Solids, Proc.
of the Royal Soc., Int.
J. NonLinear Mech., J. Elasticity, J. Nanomech. Micromech.ASCE, J.
Eur. Ceramic Soc., Math. Models Methods Appl. Sciences, Math. And Mech. of
Solids, etc.
Luca has held several visiting professorships at Cornell, the University
of Kentucky and Carnegie Mellon. He has been invited to visit multiple
universities, including Berkeley, Caltech, Columbia NYC, WisconsinMadison,
NebraskaLincoln, Ecole PolytechniqueParis,
Durham UK, Jiao Tong, Univ.Tech. Sidney, Univ.
Auckland, among many others and to many specialized workshops held in major
international conferences, such as WCCM, ECCM, ESMC, ASME, SES, SIAM, etc.
Luca’s main research interests range from nanomechanics,
multiscale modeling and multiphysics of structured
media, including applications to mechanobiology, hierarchical
materials and structures, composites, viscoelasticity, viscoplasticity,
nonlinear elasticity and viscoelasticity of new mechanochromic
sensors for structural health monitoring.
LUCA DESERI, PH.D.,
CURRICULUM VITAE
Full professor of Solid and Structural
Mechanics,
Dept. Civil, Environmental and Mechanical
Engineering,
University of Trento,
38123 Trento, Italy
http://www.ing.unitn.it/~deseril/
Adj. professor at the Mechanics, Materials
and Computing Center,
CarnegieMellon University,
Pittsburgh PA 152133890 USA
Research professor of Mechanical
Engineering,
MEMSSwanson School of Engineering,
University of PittsburghUSA
Division lead and professor of Aerospace
Engineering,
MACECollege of Engineering, Design and Physical Sciences,
Brunel University LondonUK
INDEX
4Nationality and citizenship
4Major employments and achieved ranks
5Education
6Memberships
8Scientific interests
11Recent talks and scientific activity
14Recent grants
14Organizational skills
15Networking
15Teaching and relationships with students
16Summary of the recent teaching activity
17 Experience as a professional engineer
17 Recent editorial activity
17Publications
21 Description of selected publications and their main results
·
Italy · Dec.2012present Tenured Full
professor of Solid and Structural Mechanics, Dept. of Civil, Environmental
and Mechanical Engineering, University of Trento. · April 2009November 2012 Head of the
Dept. of Mechanical and Structural Engineering, University of Trento. Supervisor
of the following laboratories: Materials,
Structural Testing and Dynamics Mechanics
and Automatics Computational
Solid and Structural Mechanics Turbomachinery Geotechnics Laboratory
for physical modeling of structures and photoelasticity Calibration
of Force Devices (Laboratory of the “University Centre of Metrology” 
C.U.M.) Wind
Turbine Test Field (CEST). · April 2008Nov.2012 Tenured Full professor of Solid Mechanics
and Strength of materials, Dept. of Mechanical and Structural Engineering,
University of Trento. On leave since August 15, 2012. · January 2005March 2008 Associate Dean of Engineering and Tenured
Full professor of Solid and Structural Mechanics, S.A.V.A. Dept. University
of Molise, Campobasso. · 2003
Rank of Full Professor. · November 2001–December 2004 Tenured Associate Professor of Solid
Mechanics, Strength of Materials and Structural Analysis at the University of
Ferrara. · 1999 Rank of Associate Professor. · Employments Abroad · July 2016onward Divisional lead and Professor of Aerospace
Engineering at the Dept. of MACEMechanical, Aerospace & Civil
Eng.College of Engineering, Design and Physical Sciences at Brunel University
of London. · January 2016to be
determined Research professor of Mechanical Engineering at
the Dept. of Mechanical Engineering and Material ScienceMEMS, University of
Pittsburgh USA. · Febr./Oct. 2015July 2018 Adj. professor at the Dept.s
of Civil and Environmental Engineering and Mechanical Engineering, Carnegie
Mellon University USA. · JanuaryJuly 2014 visiting professor at the CITDept.s of Civil and Environmental Engineering and
Mechanical Engineering, Carnegie Mellon University USA. · November 2013present full affiliate member at the Department of
Nanomedicine, Houston Methodist Research Institute, 6565 Fannin St., MS B490
Houston, TX 77030 TXUSA. · Sept. 2012Aug.
2013 visiting professorship
at the Center for Nonlinear AnalysisCarnegieMellon University USA. · August 28September 5 2009
Visiting at the Department of Mathematical Sciences  CarnegieMellon
University, Pittsburgh PA 15213. · April 15May 14 2009 Visiting at: Dept. of Mechanical Engineering, McGill
University, Montreal,
Canada. · AugustSept. 2008
Rheology Research Center
and Dept of Engineering Physics, University of WisconsinMadison, USA. · AugustSept. 2007
Dept of Engineering Physics, University of
WisconsinMadison, USA. · JulyAugust 2006 Coop endowed
Visiting Professor, College of Engineering and Department of Theoretical and
Applied Mechanics (TAM), Cornell University, New York 14853. · JanuaryJune 2005 Visiting
Professor at the Center for Nonlinear Analysis and
Department of Mathematical Sciences  CarnegieMellon University, Pittsburgh
PA 15213. · JanuaryJune 2004 Visiting
Professor at the Department of Theoretical and Applied Mechanics (TAM),
Cornell University, 212 Kimball Hall, Ithaca, New York 14853. · JanuaryJune 2002 Visiting professor at the
University of Kentucky, Department of Mathematics, Group of Continuum
Mechanics (coordinated by Dr. ChiSing Man),
Lexington KY.

1998 Postdoctoral
Associate at the Center for Nonlinear AnalysisCarnegieMellon
University, PittsburghPAUSA. 
1995 Ph.D. in Continuum
Mechanics, Strength of Materials, Structural Analysis and Applied
Mathematics. Consortium among the Universities of Pisa, Florence, Bari,
Genova, UdineItaly. 
1992 Visiting graduate
student at the Center for Nonlinear Analysis and
Department of Mathematical SciencesCarnegieMellon University,
PittsburghPAUSA.

Dec.2013present Full
Affiliate member at HMRINanomedicine Research Institute, Houston
Methodist Hospital 
September 2013present
Panel member of the SNP, Society for Natural Philosophy; 
Sept. 2009Dec. 2013:
Member of the board of five coordinators of the Italian academic area of
“Solid and Structural Mechanics”, s.s.d. ICAR/08; 
March 2008Dec. 2013 Group of Mechanics of Materials,
Italian Association of Theoretical and Applied Mechanics (AIMETA), national
coordinator since March 2008 together with R. Massabò
(Genova) and P. Vena (Milano); 
ASME American Society of
Mechanical Engineering; 
Italian Group of Fracture,
IGF; 
National Group of Applied
MathematicsSection of Engineering Mechanics, GNFMITALY. 
ISIMM, International
Society for the Interaction between Mechanics and Mathematics. 
February 2005December 2006 Member of the panel of
reviewer of the project XFast, Advanced Space Transportation, European Space
Agency (ESA), ESTEC, ABTechnologies. Project Manager: Dr.
Eng. Biagio Ancarola.
My scientific interests are in the broad
area of multiscale phenomena in Solid Mechanics and related areas of
Engineering Sciences. My recent studies can be summarized in the sequel. . Effective
properties of micro and nano composites for
standard and advanced engineering applications The necessity of detecting residual stresses in composites is often a
crucial issue in order to be able to prevent undesired stress concentrations
giving rise to local damage, debonding, pull out,
etc. Although nondestructive experimental techniques already applicable to
detect residual stresses in metals, ceramics and other materials may be
useful for resolving such stresses in composites, very little is known about
their actual influence on the effective properties of the composite. This
research devotes attention to this problem by focusing on composites formed
by randomly distributed ’small’ inclusions in a matrix; the theory is
developed for any shape although the examples are worked out for spherical
inclusions or voids. In particular, it is shown that the “danger” of
relatively small residual stresses with very rapid spatial oscillations may
result either in a magnification of the RVE size with respect to the unprestressed case or on its blowup. Henceforth, in these
cases there is no RVE that can be singled out to describe the effective
response of the composite in a local form, ultimately suggesting the
intrinsic nonlocal overall behaviour induced by the presence of residual
stresses. This ongoing project also
involves a rigorous procedure allowing for finding effective constitutive
equations for viscoelastic random composites allowing for capturing their
spacetime nonlocal behaviour; residual stresses are taken into account and
the frequency dependence of the RVEsize is discussed. Indeed, residual stresses induced by experienced past strain histories
are known to be present in viscoleastic and viscoplastic aggregates employed in structures and in
mechanical components Unfortunately,
past strain histories are, in general, not known. When further loading is
imposed, the generated stress is a combination of the effects cause by the
strain process directly associated to such loading and the residual stress
generated by the past experienced history. Residual stresses are known to
relax after some time, which may not be negligible when compared to the
duration of future strain processes induced by applied loading. Obviously,
selfbalanced residual stresses are present even without imposing further
loading. The determination of the relaxation or creep properties of such
materials are necessary for any viscoelastic analysis. Corresponding tests
are performed on virgin samples of single phased materials or composites,
usually samples are thermally annealed to eliminate memory induced effects
and then subject to testing. Nevertheless, such procedures may be neither
possible nor practical in most of the real situations, so that the
performances of viscoelastic components and structures remain influenced by
existing memory induced residual stresses. Incidentally, a novel and phenomenologicalbased stresslike variable
was introduced in the past by the candidate to single out the
"state" of a viscoelastic material. The state variable was found by
noting that different past strain histories are equivalent if they produce
the same response under any (and the same for each of the histories) further
imposed strain process with arbitrary duration. The part of the stress which
is common to all the different histories does resemble information on the
response to further zero strain processes. Indeed, when one singles out such
a process, the state variable coincides with the residual, and relaxing,
stress mentioned above. There are significant advantages on choosing such a
variable. First of all, this notion of state variable is, in general, free of
the knowledge of the particular experienced past strain: this is very
important when it comes to finding the effective response of a random
viscoelastic composite. The other advantage is the fact that relaxing
residual stresses may be detected by direct measurements. A related focus of the research is about Nanocomposites. Emphasis
on nanoreinforcements
of several kinds on polymeric/soft matter matrices are of great interest for
many cutting edge applications. Indeed the presence of soft matter and nanometricreinforcements yields exceptional properties
to the mixture such as high strength, toughness, and ductility that often
times are not present in composites at the same time. This is very similar to
the behavior of many biological structures as
nacre, dentin and mineralized bone tissues where the presence and the
particular staggers of soft proteins (chitin or collagen) and mineral nanoreinforcements (aragonite or hydroxyapatite) yields
the macroscale properties of nacre shells or mineralized biological tissues.
Experimental measures of the properties of such materials are usually
conducted at macroscale to provide possible relations among the specific
physical/mechanical parameters (strength, ductility, relaxation, thermal
conductivity/adhesive properties) and the characteristics of the compostites as the presence of crosslinks, size and
shape of reinforcements, percentage of nanoreinforcements
and so on. In this setting the prediction of the behavior
of the composite is of primary importance to provide an optimized design for
their applications. For instance, in this regard the candidate has formed a
research team which has worked out relationships among the relaxation
properties of mineralized bone tissues, composed at nanoscale
by a staggered array of mineral platelets and collagen proteins. In this chapter of my research it also falls my brand new studies on
the nonlinear elasticity and viscoelasticity of novel optomechanical/mechanochromic strain sensors applied to structural
health monitoring (SHM). This is in collaboration with Dr.
Daniele Zonta, leader of the SHM group of my dept.
in Trento and the Italian CNRIFN of Photonics, led by Dr.
Maurizio Ferrari. The researches above belong to
projects of a team led by the candidate which include Francesco Dal
Corso and Pietro Pollaci, Mech.& Structural
Engineering at the University of Trento, Emanuela
Bosco, Math. Dept.College of EngineeringBrescia and Eindhoven
UniversityMaterials Technology. A collaboration with M. Zingales
(Palermo, Italy) and W. J. Drugan at the Dept. of
Engineering Physics at the University of WisconsinMadison is also foreseen.
Collaborations with computational and experimental scientists are desirable.  Bioinspired and biological structures Bioinspired materials, basically, are defined by their
morphological/functional likeness to structures and biological tissues in
nature. The common feature to all biological tissues is represented by the
presence of a multiscale structure that can be detected both at the nanoscale than to the micrometric scale up to the
macroscale. In this perspective, even synthetic materials artificially
produced and not existing in nature, but with a highly developed multiscale
hierarchical structure, and with high functionality, are commonly known as
bioinspired materials. The relationships among the features of the
constituents forming the structure of the material, their morphological and
structural organization, and their properties exhibited at the macroscale
are the key focus of the research. Those are essential information for the
study of novel materials with enhanced mechanical properties inspired from
biological structures. The research activities will be conducted along two
fundamental directions: 1) The formulation and development of theoretical models of type
analytical/numerical able to predict the mechanical behavior
at the macroscale taking into account the presence of an internal structure
of the material. 2) The study of various nano/micro structured
materials, like ice, carbonatic matrixes admixed by
the addition of nanoparticles (nanotubes,
nanospheres) in order to obtain specific
functionality, etc. Applications of the theories of SDs (Structured Deformations), OS
(Objective Structures) and hierarchical scalings
(e.g. Fractional Calculus applied to Multiscale Mechanics), will be performed
in collaborations with D.R.Owen and K. Dayal (Carnegie Mellon), M. Zingales
and M. Di Paola (Univ.Palermo, Italy), P. Pollaci (Univ.Trento, Italy) as
well as with computational scientists of the perspective host institution. Furthermore, specific interests are foreseen in mineralized biological
tissues providing coarsingload capacity in mammaliam organisms. In this regard the mechanical behavior of bones, tendons, ligaments and other highly
functionalized tissues are very important perse but also to the extend to
conceive artificial structures with enhanced structural performances. These
features involve similar stiffness, strength and toughness among in vivo and
artificial devices. Furthermore, “selfhealing” structures may be conceived
by forming hereditary artificial materials similar to mineralized biological
tissues. For the latter this is indeed a crucial aspect for the speed of bone
reformations. In such systems macroscopic hereditariness is known to be fit
by powerlaw relaxation laws, which are associated to systems of
“springpots”. Recently the candidate has shown that the powerlaw
hereditariness experienced at the macroscale is related to the presence of
the hierarchic selfsimilar properties of bone tissues from the nanoscale. Indeed the nanoscopic
structure of bone material is represented by almost rigid mineral platelets
interconnected by soft collagen matrix. This assembly may be found almost at
any observation scale and therefore it corresponds to a fractal sequence of
mechanical objects. As we introduce a powerlaw decay with the observation
scale of the mechanical properties of the collagen matrix according, in
example, to the anomalous scaling of the crosssectional area of the
specimen, a power law decay at macroscale is experienced. The topic discussed above will be also useful to study the mechanics
of ice as a self similar structure and its time
dependent behaviour. Implications of a recent model developed by the candidate for the
mechanical behavior of biological membranes are
exploited by means of a prototypical problem, which permits to show that the
knowledge of the stretching energy density – i.e. the membrane constitutive
response with respect to local variations of area completely regulates their
spatial behavior during orderingdisordering
phenomena. For biomembranes
with coexistent fluid phases, the corresponding values of surface tension,
line tension, bending moduli and the thickness profile inside the boundary
layer where the orderdisorder transition is concentrated are calculated.
Furthermore, thickness changes in cell membranes may be initiated by
conformational changes of some domains forming membrane receptors responding
as a second messenger to external ligands. Unfortunately, thinning may
indicate the possibility of fracture of the membrane, leading to loss of
functionality of the cell aggregate.
The mentioned response may be directly linked to the coupling of
conformational and mechanical effects, the former arising in some of the
domains cited above. Stationarity of a new Helmholtz free energy, accounting
for receptor density and conformation field and strain gradients in membrane
thinning or thickening, is investigated. The density of active receptors is
directly related to the conformation field above and it enters as a source
term in the resulting balance equation for the membrane stress. Henceforth,
balance laws for the cAMP transporters and for the flux of active receptors, coupled
with the former, must be supplied
together with a balance between the diffusive powers to yield “sink” due to
the outgoing flux provided by the transporters. This work naturally continues the studies on Mechanics of nanobiological systems and it will be done together with
G. Zurlo (LMS Ecole Polytechnique Paris), L. Lunghi
and G. Valacchi, Dept. of Biology and Evolution,
Div. Of General Physiology, University of Ferrara, Italy, M. Fraldi, Interdisciplinary Center
on Biomaterials (CRIB), Università di Napoli
Federico II, NapoliItaly. Further developments are foreseen through the synergic application of
both the Theory of Objective Structures (OS) and the Field Theory of
Structured Deformations (STDs). This may be done together with K. Dayal (CEECarnegie Mellon University) for the OS part.
Application of the OS will deliver information from the smaller length scale,
including spontaneous curvature, of the individual monolayer, possibly owing
insights on the response to changes of the gaussian
curvature of each layer. In particular for biological structures such as
liposomes, planar bilayers, cell membranes, the main ingredient is to have
some averaged quantities describing the underlying geometrical changes at the
submacroscopic level resembling information about the finer structure of the
matter. This has the big advantage of delivering the key features of the
finer structure without the need of carrying along a large number of
variables and it is necessary to deliver effective Helmholtz free energies
characterizing the response of the overall system. The latter may, in fact,
depend on the macroscopic deformation through its gradient, although the
response may be affected by disarrangements occurring at the submacroscopic
level (such as slips, voids, separation of matter). The theory of STDs is the
right geometrical environment for the kinematics of the overall structure.
Such a theory is essentially a twofield approach. Indeed, besides the
deformation gradient F, a tensor field G is utilized to provide an average
measure of the local deformation. An STD is identified with the pair (F, G)
for which it is proved that macroscopically volume changes without
disarrangements (measured through detG) are always
less than or equal that the macroscopic volume ones, measured through detF. This tantamount to the ”accomodation
inequality” for STDs, which states that interpenetration of matter cannot
occur even at the submacroscopic level. For G an identification relation has
been derived in which it is shown that at any fixed material point such
tensor may been obtained as a limit of a volume average of gradients of piecewice smooth deformations (evaluated away from
disarrangement sites) converging to the given STD. The explanation above
suggests that a macrotosubmacroscopic formulation may deliver new insights
on substructured bodies starting from an effective Helmholtz free energy
through the new field theory for first order STDs proposed in by the
candidate in 2003 and expanded in more recent work. This theory may provide
an encouraging new approach which, thanks to the information delivered by the
application of the theory of OS, will be investigated specifically for
applications involving biological and bioinspired structures at the
appropriate length scales. The approach just described may allow for introducing a very
significant novelty in the way in which the theory of OS is actually
utilized. This has to do with the availability of a multiscale geometry
provided by STDs, which may allow to overcome the traditional CauchyBorn
rule, where the underlying lattice is convected
through the gradient of macroscopic deformation F to coarsegrain in the
farfield. The multiscale kinematics allows to identify G as the ”carrier” of
the underlying perfect ”lattice”, thereby allowing for modifying the usual
CauchyBorn rule through the averaged measure of deformation gradient without
disarrangements G. Henceforth lattice vectors may be convected
through such a local measure of deformation, by allowing for the interplay
between G and F to be governed by the resulting energetics, the balance laws
and the remaining conditions. Bringing together the finer scale through OS
with the target of providing effective response of biological structures
through STDs may allow for considering electromechanical coupling. Indeed,
OS may provide information about electric fields generated by charge
distributions at the atomistic level and, also, an extension of the field
theory for STDs may be worked out to include electrostatics. The latter,
together with changes in temperature and mechanical stress, may in fact
regulate many complex biological systems. In relatively simple biological
systems such as lipid membranes, not only flexoelectricity
may be accounted for, but also further work may conceivably done to explore
electromechanical coupling. Indeed, when phase transitions occur to modify
the order exhibited by the lipids, thinning or thickening are observed due to
the conformational changes of such units [4]. henceforth, dipoles distances
are not constants in such structures and this, in turn, may vary the overall
electrical response. particular attention may be devoted to the modeling of the couple behavior
of lipid tubulus which may possibly lead to the
developments of new classes of composite biomaterials. Other developments about impacts of the current research on
bioinspired materials are foreseen with prospective collaborations with M.
Ferrari (Nanomedicine Inst., The Methodist Hospital Research Institute and
Biomedical Engineering in Medicine Weill Cornell Medical College of Cornell
University), N. Pugno (University of Trento and FBK
Italy, MIT) as well as K. Bertoldi (Harvard), M. Morandotti, G.
Leoni, I. Fonseca and D. R. Owen (Carnegie Mellon). Interactions with the
perspective host institution are also foreseen, and collaborations with
computational and experimental scientists are desirable 
A new
multiscale field theory for
novel and classical materials
exhibiting microstructures; the approach is established in the
framework of the theory of structured deformations: together with D.
R. Owen, Center for Nonlinear Analysis and Dept. of
Mathematical Sciences, CarnegieMellon University, Pittsburgh PA, USA. This
framework will be extended to study the behaviour of large arrays of metamaterials,
with regards of their acoustic and mechanical behaviour. 
A new
approach to crystalline plasticity: the influence of microstructures
on the macroscopic behavior of metallic crystals
undergoing finite deformations is interpreted with the new tools provided by
the theory of structured deformations, together with D. R. Owen (see above). 
Constitutive
equations suitable for describing
both plastic and rate effects at large deformations in polymers and metals; 
Wrinkling
under tension of thin elastic sheets: ongoing research together with E. Fried, formerly Dept. of
mechanical, Aerospace and Structural Engineering, Washington University in
St. Louis, and the Dept. of Mechanical Engineering, Mc Gill University,
Montreal, Canada, now at the Department of Mechanical Engineering, University
of Washington, Seattle USA (eliot.fried@mcgill.ca); 
Theory
of viscoelasticity and
viscoplasticity and its applications: the explicit form of the maximum
recoverable work (minimal free energy) in linear viscoelasticity, together
with G. Gentili (deceased in the year 2000) and M.
Golden, head of the School of Mathematics, Dublin Institute of Technology,
Ireland; the analytic form of the minimal free
energy for continuum spectra viscoelastic material: together with M. Golden
(see above); free energies, state and St. Venant’s principle in viscoelasticity: together with G. Gentili and M. Golden, see above., 
Modelling
for cold and dry compaction of ceramic powders, joint grant with D.I.M.S.Trento. Reference
person for S.A.C.M.I. Imola S. C.: Dr. Eng. Alessandro Cocquio (Alessandro_Cocquio@sacmi.it). A related project has been done with TRWAutomotive through the
years 20052008: the subject of the work remains classified. Reference person
for TRW Automotive: Dr. Eng. Bruno Bertagna (Bruno.Bertagna@TRW.COM)
July 2016 International
Center of MechanicsCISMcourse “The Role of Mechanics in the Study of
Lipid Bilayers”, together with D.J.Steigmann
(Berkeley), M.Deserno (Carnegie Mellon), E. Fried
(OkinawaJP), J. Guven,
(Univ. Mexico), T.J.Healey (Cornell) November 2015 ASMEIMECE
World Conf. workshop 52622, Houston TX September 2015
Brunel
University of London, Mechanical, Aerospace and Civil Eng.seminars Aalto
UniversityEspoo, Finland, Mechanics seminars July 2015 Invited speaker at: ESMCEUROMECH 2015workshopon
Cell Mechanics, talk on “FrequencyBased Mechanical Targeting Of Healthy and
Cancer SingleCell Systems“, Madrid; CERMODEL conf. Talk
on “Mechanics of hierarchical ceramics”., Europ. J
of Ceramics June 2015 Invited speaker at the Special
Session #36 at the AMSEMSSPM, Porto February 2015 Invited
keynote at EUROMECH Colloquium 560: “Mechanics of Biological Membranes”, Ascona (Switzerland), ETH Zurich facility October 2014 SESASME annual meeting (Purdue IN):  invited talk at the minisymposium on Mechanobiology
of cells and tissues (ref. A Agrawal UHouston, M Taher A Saif IL,T Lele U FL))  invited talk at the mini symposium Soft Materials and Structures
(ref. P. Reis, K Bertoldi, Harvard) August 2014 Invited
speaker at the UTA_CMU/MAT/0005/2009 workshop, Instituto
Superior TécnicoLisbon July 2014
WCCMECCMIACMEccomas 2014 Invited talk at the
MMCM5Multiscale and Multiphysics Modelling for Complex Materials June 2014
Invited lecture at the ICFDAInternational Conference on Fractional Differentiation
and its Applications, CataniaItaly JanuaryApril
2014 Invited talks at  University of Pittsburgh, Dept. of Civil Engineering  Carnegie Mellon, Dept. of Mechanical Engineering  Carnegie Mellon, Civil and Environmental Engineering  Carnegie Mellon, Center for Nonlinear
Analysis Department of Nanomedicine, Houston Methodist, Health Science Center, Houston TXUSA; Sept. 2012Nov.
2013: Invited talks at: Durham University UK, School of Engineering and Computing Sciences; University of Michigan Joint Institute Jong Tong Shanghai (ref. O. A.
Bauchau) ; SES
meeting at Brown University, workshops on (i) nanobiomechanics, (ii) in honor of the SES medalist D. Steigmann; Columbia University, Dept. Mechanical Engineering (ref. J. Kysar); APS Workshop 'SoftMatter, Biology, & Bioinspiration’
Baltimore, March 2013 (ref: C. Majidi) University of Lincoln Nebraska, Mechanical Engineering, Group of
Solid Mechanics (ref. E. Baesu) Department of Nanomedicine at the University of Texas Health Science Center, Houston TXUSA;  Department
of Mathematical Sciences, Indiana University and Purdue University (ref. G. Guidoboni); Civil Engineering and Mechanics, Columbia University NYC (Ref. R. Betti); Caltech, California Institute of Technology, Graduate Aerospace
Laboratories (ref. C. Daraio; University of Pittsburgh, Mechanical Engineering and Applied
Mathematics (ref. A. Vainchtein); CNACenter
for Nonlinear AnalysisCarnegieMellon University (ref. D. R. Owen and I.
Fonseca). May 2012 Invited
talks at University of Naples and University of Bologna, Italy July 2012
8th European Solid Mechanics Conference, Graz: TU Graz Aug 2011 Invited
seminar at the Department of Engineering Sciences and Auckland Bioengineering
Institute, University of Auckland Nov 2010 Invited
talk at the CNA seminar series, Center for
Nonlinear AnalysisCarnegieMellon University USA July 2010 Eccm 2010Invited talk Workshop on Modeling of Complex Materials Apr 2010 Invited
talk at the Canadian Research Math. workshop on biovesicles,
MontrealQuebecCanada Febr 2010 Ecole Polytechnique
ParisLMS, France (talk) 2009 September AIMETA 09Ancona
(talk) August visit at the
CNACMU Pittsburgh PA July
ISDMM09Trento (talk) January GMA09Polytechnic SchoolMilan,
Italy (talk) 2008 September Opening colloquium at the RRC (Rehology
Research Center) University of
WisconsinMadisonWIUSA (reference: Prof. Dr. Eng. A. J. Giacomin, Chair,
RRC). July Invited
speaker at the symposium on "Recent Developments in the theory and
applications of Structured Deformations, Canada (reference: Prof. Dr. D. R. Owen; May Invited
speaker at the Workshop on "Modelling biomembranes
and biological structures", USA (reference: Prof.
Dr. Eng. T. J. Healey. February Visiting
professor at the Department of Mechanical, Aerospace and Structural
Engineering, Washington University in St. Louis, MO, USA (ref. Prof. Dr. Eng. E. Fried, now at the Dept. of Mechanical
Engineering, Mc Gill University, MontrealCanada); 2007 October Invited speaker at the 44th Society
of Engineering Sciences ConferenceBernard Coleman symposium, Texas A. &
M., College Station TX, USA. JulySeptember Visiting
professor at the: Department of Mathematical Sciences and Center for Nonlinear Analysis, CarnegieMellon
University, Pittsburgh PA 152133890 USA ; Department of Engineering Physics, University of
Wisconsin, Madison, USA. JanuaryFebruary Invited lectures from the following
institutions: Dept. of Mechanical Engineering, University of Wisconsin, Madison, WI,
USA; Dept. of Mathematical Sciences, CarnegieMellon University,
Pittsburgh, PA, USA; Theoretical and Applied Mechanics Dept. (TAM) Cornell University,
Ithaca, NY, USA; Dept. of Mechanical Engineering, Washington University, St. Louis, MI,
USA. 2006 JulyAugust
Coop endowed Visiting
Professor, College of Engineering and Department of Theoretical and Applied
Mechanics (TAM), Cornell University, 212 Kimball Hall, Ithaca, New York
14853, USA. MarchApril Invited lectures from the following
institutions: Department of Mathematical
Sciences and Center for Nonlinear Analysis,
CarnegieMellon University, Pittsburgh PA Aerospace and Mechanics Dept.,
University of Minnesota, Minneapolis MN, USA
(Host: Prof. Dr.
Eng. R. D. James), Dept. of Mechanical and Aerospace Engineering, Washington University,
Saint Louis MO, USA, Theoretical and Applied Mechanics Dept., Cornell University, Ithaca
NY, USA. 2005 JanuaryJune Invited Visting University Professor, Center
for Nonlinear Analysis, CarnegieMellon University, PittsburghPA, USA. 2004 JuneSeptember Visiting
professor, Center for Nonlinear Analysis,
CarnegieMellon University, PittsburghPA, USA; JanuaryJune Invited seminars in the
following institutions: Aerospace Engineering and Mechanics,
University of Minnesota, MNUSA; Theoretical and Applied Mechanics
Department (TAM), Cornell University, Ithaca, NY, USA; Center for
Nonlinear Analysis, CarnegieMellon University, PittsburghPA, USA; University of Kentucky, Department of
Mathematics (Group of Solid Mechanics), Lexington KYUSA. 2003 December Invited speaker at the Cofin 2002 Meeting, conference of the national grant
"MMSM", national coordinator Prof. P. PodioGuidugli, Bressanone,
ITALY; November Invited speaker at the
international conf. Colloquium Lagrangianum 2003,
Montpellier, France; September Invited speaker at the SNP
Meeting/IMA PI Conference: MultiscaleEffects in
Material Microstructures and Defects, University of Kentucky, Lexington
KYUSA. August Visiting at the Center for Nonlinear Analysis, CarnegieMellon
University, PittsburghPA, USA. Invited seminar, A new approach to texture
and plasticity of polycrystals. FebruaryMarch Visiting at the Center for
Nonlinear Analysis, CarnegieMellon University, PittsburghPA, USA. 2002 AugustSeptember Visiting at the Center
for Nonlinear Analysis, CarnegieMellon University, PittsburghPA, USA. July Invited lecturer at
the CISM Course: Multiscale Modeling in Continuum
Mechanics and Structured Deformations, International Center
for Mechanical Sciences, UdineItaly, July 1519, 2002. Lecturers: D.R. Owen (USA), F. Marigo (FRA), M. Silhavi (Ceck Rep.), Le (D), G.
Del Piero and R. Paroni, Italy. 2001 August Visiting at the Center for Nonlinear Analysis, CarnegieMellon
University, PittsburghPA, USA. Invited seminar, A new approach to texture
and plasticity of polycrystals. FebruaryMarch Visiting at the Center for
Nonlinear Analysis, CarnegieMellon University, PittsburghPA, USA. 2000
September Invited
speaker c/o Meeting on Dissipative Effects in
Mechanics”, Society for Natural Philosophy Meeting, University of
CaliforniaBerkeley, USA (ref. Prof. Dr. D. Steigman) June
Invited speaker c/o
Euromech2000, minisymposia “Strain localization and phase
transitions”, Metz, FRA (ref. Prof. Dr. C. Faciu, Cristian.Faciu@imar.ro). February Invited
seminar c/o Graduate Aerospace Laboratories, California Institute of
Technology, PasadenaCA USA (host: Prof. Dr. Eng. M. Ortiz).
FROM INDUSTRY 2006present: S.A.C.M.I. Imola S. C. Ceramics grant on "Modelling for cold
and dry compaction of ceramic powders", joint grant with D.I.M.S.Trento
(45 K€/year) 20072012: TRW Automotive grant. The subject of the work remains classified. (35K€/year). . FROM PUBLIC SOURCES 20092013 PRINcompetitive research funding program from
the MIURItalian Ministry of University and Research (46 K€/year per each
unit) 20122015 FP7project INTERCER2 
Modelling and optimal design of ceramic structures with defects and imperfect
interfaces ", FP7PEOPLE2011IAPP (2,5 M€)member 20132017 "HOTBRICKS 
Mechanics of refractory materials at hightemperature for advanced industrial
technologies" FP7PEOPLE2013IAPP; total funding 1.1 MEuro (funding to the research unit: 678 kEuro)member 20112012 NANOSENSE,
from the Italian Ministry of Foreign Affairs and the Italian Ministry of
University, Research and Education (55 K€)member 20072008: Chair and coordinator of INTERREGCardPhare
Meetigation of Seismisk
Risk and Modelling", CroatiaMolise program (1,5 M€/year) 20032006: Member of the National Grant "Modeling
of Polycristalline Materials", in Applied
Mathematics, Solid Mechanics, Mechanical Engineering and Material Science and
Engineering (32 K€/year) 2014present: BioNanoScaffolds for
Bone Tissue Engineering, together with TMHRIDepartment of Nanomedicine, The
Methodist Hospital Research Institute, Houston, TX USA 2014present: Mathematical modeling of the mechanics and multiphysics of BioNanoScaffolds for Bone Tissue Engineering, with ISTECCNR Faenza Italy
150K€/year, 3 years 20162019: Mathematical modeling of the biomechanics regulation and pharmacologic
antagonism of the minimal persistent flogosis in
respiratory epithelial cells, 250K€/year,Campania
Bioscience Horizon2020
A
little over six years ago, a couple of years after winning a national
competition to become full professor in Italy, the University of Molise hired
me under the strategic plan to build the brand new College of Engineering.
Immediately after, I led the startup process, with the tasks of writing the
proposal for the College under construction, including the hiring strategy,
the frame for the students plan at all levels and the growth plan. During my
permanence there, I was acting associate dean, delegate of the rector for the
relationships with industries and I was also in charge of representing the
College at the “COPI” (Union of the Italian Engineering Colleges) in Rome
instead of the Dean. During
that time I led an INTERREG project (EU funded) of the order of six hundred
thousand euros involving the areas of Seismic Engineering, Solid and Soil
Mechanics (Molise was the coordinator). In
the 2008 I was invited to be appointed by the College of Engineering at the
University of Trento, the n°1 college of engineering in Italy in ten years
out of the last twelve, where I joined the DIMSDept. of Mechanical and
Structural Engineering. Less than a year later, he was elected as head of
this institution. Given the troubles suffered by such a department in the
previous years, my plan was to push
forward issues like (i) outsourcing coming from
scientific and industrial grants and (ii) increasing international visibility
in terms of publications and international relationships. Organizational
skills may be deduced by the fact that a particularly cohesive environment for
faculties and students was built in Trento over the last year and a half. Although
the department. used to have an average balance of seven hundred thousand
euros/year, the first full year balance after my guidance jumped up to 3 millions euros/year. It is worth noting that the funding
from the central government remained constant through the years (of the order
of fifteen percent of the total). I think I gave strong motivations to the
members of my department that led to a rapid improvement in both strategic
directions and they seem to have the same trend for the upcoming year. A
good indication of having motivated colleagues is that after twenty five
years from the foundation of the department, I was able to organize the first
departmental conference ever held. This which was open to academicians,
students and industries. Managing
the following laboratories Materials
and Structural Testing Mechanics
and Automatics Computational
Solid and Structural Mechanics Turbomachinery Geotechnics Laboratory
for physical modeling of structures and photoelasticity Calibration
of Force Devices (Laboratory of the “University Centre of Metrology” 
C.U.M.) Wind
Turbine Test Field (CEST), Has
been a challenging and successful work. Particular emphasis may be put on
laboratories which are more related to my scientific interests, such as Materials
and Structural Testing, lab. for
physical modeling of structures and photoelasticity and Computational Solid and Structural
Mechanics, which are leaders across Italy and top notch across Europe. Among
the issues I pursued during my term there has been a successful improvement
of the graduate program and the increase of interdisciplinary research which
also tied together academia and
industries from Italy and foreign countries. Interpersonal
relationships are and have been also very important for me. In particular,
good relationships with colleagues, students and people from industries and
public administrations are key features that I pursued from the beginning of
my career. Faculties
normally get along very well with me. For instance, the main reason why I
have been elected as head of a department in Italy relies upon good personal
relationships as well as the capability to compromise and let people to agree
about general principles. Leading teams, getting to the goals by keeping a
good atmosphere represents a high gain for an academic environment.
A
few years after my Ph.D., which included a period of time at CarnegieMellon
University, where I also spent a Postdoc, I established a longstanding
network of international connections which actually is evolving year after
year. The
academic network, mainly includes prestigious scientists and institutions in
the USA, where I had a few visiting positions and systematic collaborations
though the years; Canada and Europe are also part of my network. Aside from
this, I also have good relationships with international industries in the
field of automotive, production of machines for pressing ceramics, etc.
My
experience ranges from the Italian to the American system, where I taught
with success at both levels. I was essentially in charge of courses in basic
and advanced (including special topics) Solid Mechanics, Statics, basic and advanced
Elasticity, Structural Mechanics, Structural Design, Linear Algebra and
Applications, Differential Equations and Applications. Many undergraduate and
master degree students were supervised in Italy with good success, as well as
a few graduate ones, who now are research fellows in Italian universities. Skills
to build up relationships with students is that I recently encouraged the
ASI, Engineering Students association in Trento to apply to the EU network BEST, the famous European
organization of students in technology; the reaction of ASI was enthusiastic.
BEST was funded by many important international industries, with over thirty
countries involved and over eighty clubs (right now there are only five
partners in Italy).
Academic Year 20082009 through present Solid
Mechanics II, BS course for Mechanical and Material Science and Engineering
majors, College of Engineering, University of TrentoItaly. Solid Mechanics and Advanced Structural
Engineering II, BS course for Civil Engineering majors,
College of Engineering, University of TrentoItaly. Solid Mechanics and Advanced Structural
Engineering, MS course for Building and Architectural
Engineering majors (EU program), College of Engineering, University of
TrentoItaly. Academic Year 20072008 Solid
Mechanics I, BS course for Mechanical and Material Science and Engineering
majors, College of Engineering, University of TrentoItaly. Solid
Mechanics II, BS course for Mechanical and Material Science and Engineering
majors, College of Engineering, University of TrentoItaly. Academic
Year 20062007 Structural Design, BS course for Civil Engineering majors, Applied Structural Design I and II, courses for Industrial Engineering
majors, ,College of Engineering, University of MoliseItaly. Solid
Mechanics II, BS course for Mechanical and Material Science and Engineering
majors, College of Engineering, University of TrentoItaly. Academic Year 20052006 Cornell University Summer
2006: TAM310 Advanced
Engineering Mathematics; University of Molise Termoli (Civil Eng.): Statics, Theory of
Structures, Strength of Materials. Campobasso (Mechanical Eng.) Strength
of Materials. University
of Ferrara (Mechanical Eng. and Material Science) Basics of Solid and
Fracture Mechanics. Academic Year 20032004 Spring Semester 20032004 (JanuaryJune 2004): Topics in Continuum Mechanics, TAM754:
Multiscale Geometry in the Statics and Dynamics of Microstructural Changes.
Graduate Program in Theoretical and Applied Mechanics, Cornell University,
Ithaca NY USA. Selected Theses advised: PhD., Galuppi,
L.: On the influence of the Laplace pressure on sintered materials: ongoing
research. Solid Mechanics Group, Dept. of Mechanical and Structural Engineering,
University of Trento (2012). PhD: Zurlo, G.: Material and geometric phase transitions in biological
membranes, Dissertation for the fulfilment of the Doctorate of Philosophy in
Structural Engineering and Continuum Mechanics (Advisors: L. Deseri, R. Paroni, S.
Marzano, CoAdvisor T. J. Healey), University of Pisa, (2008).  BS thesis about "Measure of the
stress intensity factor for ceramic materials suitable for biomedical
applications", in collaboration with the Ceramics Center
of ENEA (National Agency of Alternative
Energies and Technologies) FaenzaRAItaly;  MS thesis about "Meshless models for
the predictions of rate sensitive irreversible large deformation processes in
manufacturing".
My experience in this field may be
summarized as follows. Registered MS Civil and Mechanical Engineer
since 1990Italy Consultant part time in structural design
at “Studio Giuliani Engineering”, via Chiesa 1, Rovereto
(FE) Italy 19901996, 19982001/2003, 20062011 Cofunder of “Sinapsy Engineering s.a.s.”
1995 (quit in 1997) Consultant for “Studio Giuliani
Engineering”, 2007present Consultant for SACMI Imola,
20082010. Consultant for TRW Automotive Italy,
2007present Professional testing of monumental
structures (e.g. churches) Professional testing of masonry
structures, reinforced concrete structures, steel and aluminium structures.. 
Recent
editorial activity The
most recent activity has involved the nomination as Associate Editor of
Frontiers in Materials, sect. of Mechanics of Materials, a Nature publisher
group (EPFL, Switzerland). Editorial
board member of: Journal of Nanomaterials, International Journal of Medical
Nano Research, Journal of Nanomedicine and Applications, Mathematical Problems
in Engineering. Furthermore,
service as reviewer is provided for the following journals : Nature
Communications, Biomechanics
and Modeling in Mechanobiology, Journal
of the Mechanics and Physics of Solids, Proceedings
of the Royal SocietyA, International
Journal of Solids and Structures, Communications in Nonlinear Science and Numerical
Simulation Journal
of Nanomechanics and Micromechanics, Journal
of Elasticity, Mathematics
and Mechanics of Solids, Meccanica, ZAMM Zeitschrift fuer Angewandte Mathematik und Physik, Journal
of the European Ceramic Society, Physics
of fluids, Mathematical
Models and Methods in Applied Sciences, Evolution
Equations and Control Theory (EECT). Publications
1.
S S Soumya,
A. Gupta, A. Cugno L. DESERI, K.Dayal,
D. Das, S. Sen, M. Inamdar, Coherent motion of
monolayer sheets under confinement and its pathological implications,
accepted for publication on PLOS ONEComputational Biology, arXiv:1507.06481
[qbio.CB] 2.
M.
Fraldi, A. Cugno, L.
DESERI, K. Dayal and N. Pugno (2015). A
frequencybased hypothesis for mechanically targeting healthy and cancer
singlecell systems. J. ROYAL SOC.INTERFACE doi: 10.1098/rsif.2015.0656 3.
L. DESERI, P. Pollaci, M. Zingales, K. Dayal (2015) Fractional
Hereditariness of Lipid Membranes: Instabilities and Linearized Evolution. J.
Mech. Behavior of Biomedical MaterialsJMBBM
DOI:10.1016/j.jmbbm.2015.09.021 4.
DESERI
L., Owen D. R. (2015). Stable Disarrangement Phases Arising from
Expansion/Contraction or from Simple Shearing of a Model Granular Medium, Int.
J. Engineering Sciences doi:10.1016/j.ijengsci.2015.08.001 5.
DESERI L., Zingales M.
(2015). A mechanical picture of fractionalorder Darcy equation., doi:10.1016/j.cnsns.2014.06.021
COMM. NONLINEAR SCIENCE NUM. SIMULATION 6.
MM Terzi, K Dayal, L Deseri, M Deserno
(2015) Revisiting the Link between Lipid Membrane Elasticity and Microscopic
Continuum Models, Biophysical Journal
108 (2), 87a88a doi: 10.1016/j.bpj.2014.11.510 7.
DESERI
L., Owen D. R., (2015). Submacroscopic
Disarrangements Induce a Unique, Additive and Universal Decomposition of
Continuum Fluxes, J. Elasticity doi:
10.1007/s1065901595425 8.
A. Piotrowska, Valentina
Piccolo, A. Chiappini, M. Ferrari, M. Pozzi, L. DESERI, D. Zonta
(2015) Mechanochromic Photonic Crystals for
Structural Health Monitoring, STRUCTURAL HEALTH MONITORING, DEStech Publications Inc. doi:
10.12783/SHM2015/386 9.
Finkenauer
L., Weissmann J., DESERI L., Majidi
C. (2014). Saddlelike Deformation in a Dielectric Elastomer Actuator
Embedded with LiquidPhase GalliumIndium Electrodes, doi:
10.1063/1.4897551 J APPL PHYSICS 116, 144905 (2014) 10.
DESERI
L., Gentili G., Golden J. M., (2014). New Insights
on Free Energies and SaintVenant’s Principle in
Viscoelasticity, doi:
10.1016/j.ijsolstr.2014.05.031 INT. J. OF SOLIDS AND STRUCTURES 11.
DESERI L., Zingales M., Pollaci, P., (2014). The state of Fractional Hereditary
Materials (FHM), DIFF. EQN.S AND DYNAMICAL SYSTEMSDCDSB DCDSB 197 doi:10.3934/dcdsb.2014.19.2065 12.
DESERI L., Owen D. R., (2014) Stable Disarrangement
Phases of Elastic Aggregates: a Setting for the Emergence of Notension
Materials with Nonlinear Response in Compression, MECCANICA doi::10.1007/s1101201400427 13.
DESERI
L., Di Paola M, Zingales M., (2014). Free Energy
and States of FractionalOrder Hereditariness, INT. J. OF SOLIDS AND
STRUCTURES doi: 10.1016/j.ijsolstr.2014.05.008, 14.
Galuppi
L., DESERI L., (2014). Combined
effects of the interstitial and
Laplace pressure in hot isostatic pressing of cylindrical specimens, J. OF
THE MECH. MATERIALS AND SOLIDS doi: 10.2140/jomms.2014.9.1 15.
DESERI L., Owen D. R.,(2014) Stable Disarrangement
Phases of Granular Media I: Classification of the Disarrangement Phases of a
Model Aggregate, 14CNA005 16.
DESERI L., Owen D. R., (2014) Stable Disarrangement
Phases of Elastic Aggregates: a Setting for the Emergence of Notension
Materials with Nonlinear Response in Compression, 14CNA006 17.
DESERI L., Zurlo G.,
(2013). The stretching elasticity of biomembranes
determines their line tension and bending rigidity, BIOMECH. MODELING IN MECHANOBIOLOGYBMMB,
DOI: 10.1007/S102370130478Z. 18.
DESERI
L., Di Paola M., Zingales M., Pollaci P., (2013). Powerlaw
hereditariness of hierarchical fractal bones, INT. J. NUM. METH. BIOMEDICAL
ENG. DOI: 10.1002/cnm.2572 19.
Dal
Corso, F., DESERI, L., (2013). Residual stresses in random
elastic composites: nonlocal micromechanicsbased models and first estimates
of the representative volume element size, MECCANICA, DOI:
10.1007/s110120139713z. 20.
DESERI
L., Pugno N. M., Pollaci P., (2013). Towards
understanding adhesion of graphene and lipid layers, PROC. CONF. ON DIAMOND
AND CARBON MATERIALS, Elsevier. 21.
Lunghi
L., DESERI L., (2013). Lock and key mechanism for ligand binding with
adrenergic receptors and the arising mechanical effects on the cell membrane,
BULL. AMERICAN PHYSICAL SOCIETY 58 (1). 22.
DESERI
L., Di Paola M., Zingales M., Pollaci P., (2013). Micromechanicsbased
free energy for Fractional Hereditary Materials (FHM), Proc. XXI AIMETA
conf., Torino Sept. 1720. 23.
DESERI
L., Owen D. R., (2012). Moving interfaces that separate loose and compact
phases of elastic aggregates: a mechanism for drastic reduction or increase
in macroscopic deformation, CONTINUUM MECHANICS AND THERMODYNAMICS, DOI:10.1007/s001610120260y. 24.
Bosi
F., Mazzocchi E., Jatro I., Dal Corso F., Piccolroaz A., DESERI L., Bigoni
D., Cocquio A., Cova M., Odorizzi S.,
(2012). A collaborative project between Industry and
Academia to enhance Engineering Education at graduate and Ph.D
level in Ceramic Technology, Accepted for publication on INT.J. ENGINEERING
ED. 25.
Lunghi
L., DESERI L., (2012). Strain gradient membrane effects during cyclic
Adenosine Monophosphate Pathway in human trophoblast cells, Proc. IGF conf.,
ISBN 9788895940373. 26.
DESERI L., Zurlo G.,
(2012). 12CNA016 Line tension and bending rigidity of biomembranes
are determined by their stretching elasticity, Center for Nonlinear Analysis,
Carnegie Mellon University, preprints series. 27.
DESERI
L., Marcari G., Zurlo G., (2012). Thermodynamics, Chapter 5, In:
Continuum Mechanics, EOLSSUNESCO Encyclopedia, G. Saccomandi
and J. Merodio Editors. Invited paper. 28.
DESERI
L., Owen D. R., (2012). Structured deformations and the mechanics of submacroscopically structured solids: perspectives on a
new approach, in Nanotechnologies and Smart materials for SHM, Final report
of "Nanosense 2011", 6172, ISBN:
9788888102474. 29.
Puntel
E., DESERI L., Fried E., (2011). Wrinkling
of a Stretched Thin Sheet. J. ELASTICITY,
105 137170,
DOI:10.1007/s1065901092905. 30.
Dal
Corso F., DESERI L., (2011). First estimates on the RVE size of random elastic
composites with residual stresses, Proc. XX AIMETA conf., Bologna, Sept. 1215, 2011, ISBN 9788890634017. 31.
Bigoni
D., DESERI L., (2011). Recent Progress in the Mechanics of Defects, Springer
ISBN 9789400703131. 32.
DESERI
L., Owen D. R., (2010). Submacroscopically
Stable Equilibria of Elastic Bodies Undergoing Disarrangements and
Dissipation, MATH. MECHANICS OF SOLIDS, 15 (6) 611638. 33.
DESERI
L., Drugan W. J., (2009). An exact
micromechanics based nonlocal constitutive equation for random viscoelastic
composites, Proc. of the MDP 2007 Conf. 34.
Fabbrocino
G., Laorenza C., Rainieri C., Santucci De Magistris
F., Salzano C., DESERI L., (2009). Seismic monitoring of a retaining
wall on piles made of reinforced concrete, XIII ANIDIS 2009 Conference,
Bologna. 35.
Rainieri
C., Fabbrocino G., Santucci de Magistris F., Laorenza C., DESERI L., (2009). Operational
Modal Analysis for identification of geotechnical systems, Proc. XIX AIMETA
Conf., Ancona. 36.
DESERI
L., Piccioni M. D., Zurlo G., (2008). Derivation of
a new free energy for biological membranes, CONT. MECH. THERMODYNAMICS 20
(5), 255273. 37.
DESERI L., Golden M. J. ( 2007). The Minimum Free
Energy for Continuous Spectrum Materials. SIAM J. APPLIED MATH. 67 (3),
869892. 38.
DESERI L., Healey T. J., (2007). Variational
derivation for higher gradient Van der Waals fluids equilibria and
bifurcating phenomena. NOTE DI MATEMATICA 27, 7195. Invited paper in
recognition of the sixtieth birthday of William Alan Day. 39.
DESERI L., Golden M. J., Fabrizio
M., (2006). The Concept of a Minimal State in Viscoelasticity: New Free
Energies and Applications to PDEs. ARCH. RAT. MECH. ANAL. 181, 4396. 40.
DESERI L. (2004). Crystalline plasticity and
structured deformations. In “Multiscale Modeling in Continuum Mechanics and
Structured Deformations”, G. Del Piero and D. R.
Owen editors, 203230, Springer New York, Wien. 41.
DESERI
L., Owen D. R., (2003). Toward a field theory for elastic bodies undergoing
disarrangements. JOURNAL OF ELASTICITY 70 (I), 197236. 42.
DESERI
L., Owen D. R., (2002). Energetics of Twolevel Shears and Hardening of
Single Crystals. MATH. MECHANICS OF SOLIDS 7, 113147. 43.
DESERI
L., Owen D. R.,. (2002). Invertible Structured Deformations and the
Geometry of Multiple Slip in Single Crystals, INTERNATIONAL JOURNAL OF
PLASTICITY 18, 833849 44.
DESERI
L., Gentili G., Golden M. J., (2002). On the minimal
free energy and the SaintVenant principle in
linear viscoelasticity, in Mathematical Models and Methods for Smart
Materials, Series on Advances in Math. For Appl. Sciences, World Scientific
Publ. 45.
DESERI
L., Owen D. R., (2000). Active SlipBand Separation and the Energetics of
Slip in Single Crystals. INT. J.
PLASTICITY 16, 14111418. 46.
DESERI L., Mares R., (2000). A Class of Viscoelastoplastic Constitutive Models Based on the
Maximum Dissipation Principle. MECHANICS OF MATERIALS 32, 389403. 47.
DESERI
L., Bucknall C. B., Rizzieri R., (2000). Variability
in the temperature of the secondary loss peak in rubber toughened due to
multiple cavitation of the rubber particles, Proc. XI Int. Conf. Deformation
Yield and Fracture of Polymers, Cambridge UK 48.
DESERI
L., Owen D. R., (2000). The critical shear stress in single crystals and
structured deformations. Proc. EUROMECHMECAMAT, Metz, France, 2629 June. 49.
DESERI
L., Gentili G., GOLDEN M. J., (1999). An Expression
for the Minimal Free Energy in Linear Viscoelasticity. J. ELASTICITY 54,
141185. 50.
Benedetti A., DESERI L., (1999). On a Viscoplastic ShanleyLike Model
Under Constant Load, INT. J. SOLIDS
AND STRUCTURES 36, 52075232. 51.
DESERI
L., Owen D. R., (1999). A description of the PortevinLe
Chatelier effect in single crystals based on
structured deformations, Proc. of Plasticity 99; 3134 ISBN: 0965946312. 52.
DESERI
L., Gentili G., Golden M. J., (1999). Minimal free
energy for linear viscoelastic solids in the frequency domain, Proc. XIV Aimeta Conf., Como. 53.
Benedetti A., DESERI L., (1998). On the behaviour of a viscoelastoplastic
Shanley model under constant load, Proc. 2nd Int.
Conf. on Mechanics of Time Dependent Materials, Pasadena March14. 54.
Del
Piero G., DESERI L., (1997). On the concepts of state and free energy in linear
viscoelasticity. ARCH. RAT. MECH. ANAL. 138, 135. 55.
Benedetti A., DESERI L., (1997). Generalized
displacements evolution for a Shanley bar on viscoelastoplastic hardening soil, 3rd Euromech Solid Mechanics Conf., Stockholm Aug. 1822. 56.
Del
Piero G., DESERI L., (1996). On the analytic expression of the free energy in linear
viscoelasticity. J. ELASTICITY 43, 247278. 57.
Benedetti
A., DESERI L., Tralli A., (1996). Simple
and effective equilibrium models for vibration analysis of curved rods,
ASCE, J. ENG. MECHANICS 122 (4),
291299. 58.
Del
Piero G., DESERI L., (1995). Monotonic, completely monotonic, and exponential
relaxation functions in linear viscoelasticity, QUART. APPL. MATH. 53 (2),
273300. 59.
DESERI L., (1995). A priori restrictions on the
relaxation function in linear viscoelasticity, dissertation for the fulfilment
of the Ph.D. in Solid and Structural Mechanics, Consortium among the
universities of Pisa, Florence, Udine, Genova, BariItaly. Submitted manuscripts: in process Papers to be submitted 60.
Dayal
K., DESERI L., Lunghi L., Pollaci
P., GPCR receptors like to be on lipid rafts. 61.
Dayal
K., DESERI L., Lunghi L., Pollaci
P., Towards modelling membrane effects during cyclic Adenosine Monophosphate
Pathway in human trophoblast cells. Papers in preparation. 62.
DESERI L., Zingales M., Pugno N., Micromechanics of the torsional response of hereditary
hierarchical solids: the case of bone 63.
Cugno
A., DESERI L., Fraldi
M., Fractional cell response to ultrasound vibrations. 64.
DESERI L., Zingales M., Constitutive
Model of Hereditary Fluid Mosaic of Lipid Bilayers. 65.
Dayal
K., DESERI L., Elasticity and peridynamics of thin
films. 66.
Dayal
K., DESERI L., The derivation of electromechanical coupling for flexoelectric membranes. 67.
DESERI L., Pugno N. M., Pollaci P.,
Defects and adhesion of compliant films: the case of soap bubbles. 68.
DESERI L., Man C.S., Paroni
R., A probabilistic approach to the plasticity of single crystals accounting
for macroscopic noncrystallographic slips. 69.
Dal Corso F., DESERI L., Drugan
W. J., Zingales M., Viscoelastic random elastic
composites: nonlocal micromechanicsbased models and estimates of the
representative volume element size. 70.
DESERI L., Owen D. R., Elasticity of hierarchical
bodies predicted with multilevels Structured Deformations. 71.
A.
Cugno L. DESERI, K.. Dayal,
M. Fraldi S S Soumya, A. Gupta, D.. Das, S. Sen, M. Inamdar,
New predictions on gastrulation of epithelial cell monolayers 72.
DESERI L., Finkenauer L., Majidi C, Weissmann J.,
Modeling of Curved Cantilever Dielectric Elastomer Actuator Using Universal
Solution in Finite Bending. Description of some selected publications
and of the included main results In this section a selection of
papers is presented. In particular, it emerges that very many of the
published papers, particularly the ones prior 2012, contain several original
results, each of which could have been published separately form the others.
This choice has led to fewer, yet qualitatively higher level
publications. DESERI L., and G. Zurlo (2013) In this work, some implications of a recent model
for the mechanical behavior of biological membranes
(Deseri et al. in Continuum Mech
Thermodyn 20(5):255–273, 2008) are exploited by
means of a prototypical onedimensional problem. We show that the knowledge
of the membrane stretching elasticity permits to establish a precise
connection among surface tension, bending rigidities and line tension during
phase transition phenomena. For a specific choice of the stretching energy
density, we evaluate these quantities in a membrane with coexistent fluid
phases, showing a satisfactory comparison with the available experimental
measurements. Finally, we determine the thickness profile inside the boundary
layer where the order–disorder transition is observed. DESERI L., Di Paola M., Zingales M., Pollaci P. (2013),
Powerlaw hereditariness of hierarchical fractal bones, INT. J. NUM. METH.
BIOMEDICAL ENG. in press. In this paper the authors
introduce a hierarchic fractal model to describe bone hereditariness. Indeed, experimental data of stress
relaxation or creep functions obtained by compressive/tensile tests have been proved to be fit by powerlaw
with real exponent 0< b <1. The
rheological behavior of the material has therefore
been obtained, using the BoltzmannVolterra
superposition principle, in terms of real order integrals and derivatives
(fractionalorder calculus). It is shown that the powerlaws describing
creep/relaxation of bone tissue may be obtained introducing a fractal
description of bone crosssection and the Hausdorff
dimension of the fractal geometry is then related to the exponent of the
powerlaw. Dal Corso, F. AND DESERI, L.,
(2013) Residual stresses in random elastic composites: nonlocal
micromechanicsbased models and first estimates of the representative volume
element size, MECCANICA, in press DOI: 10.1007/s110120139713z Random elastic composites with
residual stresses are examined in this paper with the aim of understanding
how the prestress may influence the overall
mechanical properties of the composite. A fully nonlocal effective response
is found in perfect analogy with the unprestressed
case examined in (Drugan and Willis, J. Mech. Phys.
Solids 44(4):497–524, 1996). The second gradient approximation is considered
and the impact of the residual stresses on the estimate of the RVE size is
studied whenever the local response is used to describe the mechanical
properties of the heterogeneous medium. To this aim, total and incremental
formulations are worked out in this paper and the influence of both uniform
and spatially varying prestresses are studied. Among other results, it is shown
how rapid oscillations of relatively “small”residual
stresses in most cases may result in the impossibility of describing the
overall behavior of the composite with a local
constitutive equation. On the other hand, prestresses
with relatively high amplitudes and slow spatial oscillations may even reduce
the RVE. DESERI L. and Owen, D. R. (2012).
Moving interfaces that separate loose and compact phases of elastic
aggregates: a mechanism for drastic reduction or increase in macroscopic
deformation, CONTINUUM MECHANICS AND THERMODYNAMICS, in press.
doi:10.1007/s001610120260y This paper encompasses some of the new features of the approach now
available to study the mechanics of
materials through the field theory of Structured Deformations. In particular here our attention is devoted to granular materials. For
instance s in sand of powdered
ceramics the material may be viewed as a continuum composed of much smaller
elastic bodies. The multiscale geometry of structured deformations captures
the contribution at the macrolevel of the smooth
deformation of each small body in the aggregate (deformation without disarrangements)
as well as the contribution at the macrolevel of
the nonsmooth deformations such as slips and separations between the small
bodies in the aggregate (deformation due to disarrangements). When the free
energy response of the aggregate depends only upon the deformation without
disarrangements, is isotropic, and possesses standard growth and
semiconvexity properties, we establish (i) the
existence of a compact phase in which every small elastic body deforms in the
same way as the aggregate and, when the volume change of macroscopic
deformation is sufficiently large, (ii) the existence of a loose phase in
which every small elastic body expands and rotates to achieve a stressfree
state with accompanying disarrangements in the aggregate. We show that a
broad class of elastic aggregates can admit moving surfaces that transform
material in the compact phase into the loose phase and vice versa and that
such transformations entail drastic changes in the level of deformation of
transforming material points. E.
Puntel, DESERI L., E. Fried
(2011). Wrinkling of
a Stretched Thin Sheet. J. Elasticity, 105, 137170. This paper represents one of the
first analytic studies for the investigation of the occurrence and the
development of wrinkling in thin sheets undergoing tension. When a thin
rectangular sheet is clamped along two opposing edges and stretched, its
inability to accommodate the Poisson contraction near the clamps may lead to
the formation of wrinkles with crests and troughs parallel to the axis of
stretch. The proposed energy functional includes bending and membranal contributions, the latter depending explicitly
on the applied stretch. Motivated by work of Cerda, RaviChandar,
and Mahadevan, the functional is minimized subject
to a global kinematical constraint on the area of the midsurface of the
sheet. Analysis of a boundaryvalue problem for the ensuing Euler–Lagrange
equation shows that: wrinkled solutions exist only above a threshold of the applied
stretch, which is actually quite small; there exists a sequence of critical values of the applied stretch,
which is determined for the first time in the literature, displaying modes with
many wrinkles. The items
above predict for the first time the experimental fact that many wrinkles in
thin polymeric sheets are observed almost immediately under very small
applied stretches. Although previously proposed
scaling relations for the wrinkle wavelength and rootmeansquare amplitude
are confirmed, in contrast to the scaling relations for the wrinkle wavelength
and amplitude, the applied stretch required to induce any number of wrinkles
depends on the inplane aspect ratio of the sheet. When the sheet is
significantly longer than it is wide, the critical stretch scales with the
fourth power of the lengthtowidth. With some efforts the same
procedure may be extended to account for: viscoelasticity of the membrane, leading to studies of wrinkling
relaxation and creep; this may be relevant for corrugated layered composite sensor
(e.g. polymeric films alternated with deposited gold, etc.), for which the
ridges and troughs must be kept in their original shape and hence relaxation
must be limited/prevented; biomembranes, for which the evolving
elastic/viscoelastic properties of the lipid bilayer may in fact exhibit
undesired wrinkling; as well as
other cases and applications. DESERI L. and Owen, D. R. (2010). Submacroscopically Stable Equilibria of
Elastic Bodies Undergoing Disarrangements and Dissipation, MMS, 15 (6) 611638. This paper is a step forward towards
elucidating the behaviour of continua with microstructure undergoing
disarrangements (e.g. slips, voids, micro fractures, etc.) initiated in (8)
and continued in (7) (and other papers) within the specific context of the
plasticity of metallic single crystals. The new and general field theory for
bodies with microstructure provided in (6) sets the basis of all the further
developments. In this framework, the notion of a
submacroscopically stable equilibrium configuration
of a body and the procedure introduced here for the determination of submacroscopically stable equilibria provide the basis
for selecting in a systematic way preferred submacroscopic
geometrical states of bodies in equilibrium. The augmented energy underlies
this methodology and provides a functional of the macroscopic deformation and
the discrepancy (D= GM) between the deformation
gradient without disarrangements and the diffused measure M of such
quantities that is stationary for fixed D at equilibrium configurations.
This augmented energy is proved not to increase under purely submacroscopic, quasistatic processes
in timeindependent environments. These ideas were developed in
Section 3 for arbitrary elastic bodies undergoing disarrangements and dissipation
and were illustrated for specific bodies in Sections 4 and 5. In particular, polymers
and other ductile materials could be described as the bodies studied in
Section 4; the latter have biquadratic free energy response, and their submacroscopically stable equilibria arise only for submacroscopic geometries associated with the spherical
phase, the classical phase, or the prolate phase,
depending upon the value of the ratio Another class of rheological
interesting materials, called here nearsighted fluids, are discussed in
Section 5 possess universal spherical and universal prolate
phases] that generally are not stressfree, but the submacroscopically
stable equilibria that are available to such fluids all are stressfree. DESERI L., Piccioni M.
D.. AND G. Zurlo (2008).
Derivation of a new free energy for biological membranes, Continuum Mechanics and Thermodynamics 20 (5), 255273. A new free energy for quasiincompressible
and “inplane fluid” thin biomembranes depending on
chemical composition, temperature, degree of order and membranalbending
deformations is derived in this paper for the first time in the literature. The identification of the membranal contribution to the energy, which is the first
order term of it, is done on the basis of a bottomup approach: this relies
upon statistical mechanics calculations. The main result is an expression of
the biomembrane free energy density, whose local
and nonlocal counterparts turn out to be weighted by different powers of the
reference thickness of the bilayer. The resulting energy exhibits three
striking aspects: (i) the
local (purely membranal) energy counterpart turns
out to be completely determined through the bottomup approach mentioned
above, which is based on experimentally available information on the nature
of the constituents; (ii) the nonlocal energy terms,
that spontaneously arise from the 3D–2D dimension reduction procedure,
account for both bending and nonlocal membranal
effects, the latter being proportional to the magnitude of the gradient of
the thinning/thickening measure of strain; (iii) such terms turn out to be
uniquely determined by the knowledge of the membranal
energy term, which in essence represents the only needed constitutive
information of the model; (iv) the “line tension” between
different phases is recovered through the membrane nonlocal term, arising in
boundary layers between thick and thin zones; (v) the classical Helfrich model,
which neither accounts for chemical composition and temperature nor for the
membrane part of the energy (and hence for the switching of phases), is
recovered as particular case of the obtained energy. It is worth noting that the coupling
among the fields appearing as independent variables of the model is not
heuristically forced, but it is rather consistently delivered through the
adopted procedure. Applications to studies of elastic
bifurcations of planar and curved biomembranes may
be suitable, as well as extensions to account for the viscoelasticity of
liposomes. Studies on bioinspired nanostrusctured
artificial materials may also be pursued by extending the obtained energy. Applications to more complex
biological situations are also under investigations, such as (12). DESERI L., Golden J. M. (2007). The Minimum Free Energy for Continuous
Spectrum Materials. SIAM JOURNAL ON APPLIED MATHEMATICS 67 (3), 869892. A general closed expression is
given for the isothermal minimum free energy of a linear viscoelastic
material with continuous spectrum response. Two quite distinct approaches are
adopted, which give the same final result. The first involves expressing a positive quantity, closely related to
the loss modulus of the material, defined on the frequency domain, as a
product of two factors with specified analyticity properties. The second is the nontrivial generalization of the continuous
spectrum version of a method used by Breuer and Onat
for materials with relaxation function given by sums of exponentials. It is further shown that under the assumed properties of the continuum
spectrum materials envisaged in this work, minimal energy states, obtained by
Del Piero and Deseri (see
e.g. ref. (10) of this list) are uniquely related to histories and the work
function is the maximum free energy with the property that it is a function
of state. Further
developments may be devoted to examine materials with less restrictive
properties on its relaxation, such as “power law polymers”, so that the new spectra may determine a
nontrivial equivalence class of histories leading to the same minimal state.
In such a case the methods (a) and (b) must be revisited for a nontrivial
extension. DESERI L., Golden M. J. AND M. Fabrizio (2006). The Concept of a Minimal State in Viscoelasticity:
New Free Energies and Applications to PDEs. Archive for Rational Mechanics and Analysis
181, 4396. This is a modern and key work on fundamental aspects of viscoelasticity,
which may have practical impacts whenever mechanical components and
structures are employed after experiencing unknown and recent past strains.
The same issue arises if specimen are subject to treatments resulting in the
presence of relaxing prestresses. Indeed, in this paper the impact
on the initialboundary value problem, and on the evolution of viscoelastic
systems of the use of a new definition of state based on the
stressresponse.. Comparisons are made between this new approach and the
traditional one, which is based on the identification of histories and states.We shall refer to a stressresponse definition of
state as the minimal state, introduced by Del Piero
and Deseri in 1997. The energetics of linear
viscoelastic materials is revisited and new free energies, expressed in terms
of the minimal state descriptor, are derived together with the related
dissipations. Furthermore, both the minimum and the maximum free energy are
recast in terms of the minimal state variable and the current strain. The initialboundary value problem
governing the motion of a linear viscoelastic body is restated in terms of
the minimal state and the velocity field through the principle of virtual
power. The advantages are: the elimination of the need to know the paststrain history at each
point of the body, and the fact that initial and boundary data can now be prescribed on a
broader space than resulting from the classical approach based on histories. These
advantages are shown to lead to natural results about wellposedness and stability of the motion. Finally, we show how the evolution
of a linear viscoelastic system can be described through a strongly
continuous semigroup of (linear) contraction operators on an appropriate
Hilbert space. The family of all solutions of the evolutionary system,
obtained by varying the initial data in such a space, is shown to have
exponentially decaying energy. Further striking developments are
foreseen in the field of Computational Mechanics, because of new and open
possibilities of getting new variational principles
for viscoelastic mechanical components and structures whenever they are
subject to unknown preexisting strains. DESERI L., D. R. Owen. (2003). Toward a field theory for
elastic bodies undergoing disarrangements. JOURNAL OF ELASTICITY 70 (I), pp. 197236. The vast scope of elasticity as a
continuum field theory includes the description at the macrolevel
of the dynamical evolution of bodies that undergo large deformations, that
respond to smooth changes in geometry by storing mechanical energy, and that
experience internal dissipation in isothermal motions only during nonsmooth
macroscopic changes in geometry such as shock waves. Nevertheless, the needs of
bridging closer relationships between the mechanical behaviour at the submacroscopic level and its influence at the macrolevel push forward ideas to deriving multiscale
theories, physicallybased, which may generalize the classical “onescale”
nonlinear elasticity. The research described in this
paper leads to employing structured deformations of micro/nanostructured
continua to obtain a field theory capable of describing such bodies, in the
context of dynamics and large isothermal deformations. In other words, an
approach owing the evolution of bodies that: undergo smooth deformations at the macroscopic length scale, that can experience piecewise smooth deformations (disarrangements) at submacroscopic length scales, and that can not only store energy but can also dissipate energy during such
multiscale geometrical changes, is fully
worked out in this paper. The constitutive assumptions
employed in this derivation permit the body to store energy as well as to dissipate energy in
smooth dynamical processes. Only one nonclassical field G, the deformation
without disarrangements, appears in the field equations, and a consistency
relation based on a decomposition of the Piola–Kirchhoff
stress circumvents the use of additional balance laws or phenomenological
evolution laws to restrict G. The field equations are applied to an elastic
body whose free energy depends only upon the volume fraction for the
structured deformation. Existence is established of two universal phases, a
spherical phase and an elongated phase, whose volume fractions are (1 −
γ_{0})^{3} and (1 − γ_{0})
respectively, with γ_{0} := (√5 − 1)/2 the “golden
mean”. Applications of such a theory are vitually infinite, as well as specialization to problems
of plasticity, damage and other inelastic phenomena involving ductile, as
well as granular, materials. Dimensionally reduced theories for beams, plates
and shells made of ductile materials undergoing dissipative disarrangements
look a fertile and very promising perspective for such an approach. DESERI L., D.R.Owen.
(2002). Energetics of
Twolevel Shears and Hardening of Single Crystals. MATHEMATICS AND MECHANICS
OF SOLIDS 7, 113147. With the aim of showing he impact
of a new energetic description of the hardening behavior
of single crystals undergoing single slip derived by Deseri
and Owen (IJP 2000) is analyzed in this work by
examining and modelling experiments of Sir. G.I. Taylor and Elam on the
distortion of metallic single crystals. Simultaneous macroscopic simple
shear and mesoscopic slips are described by means of a class of structured
deformations called ‘‘twolevel shears,’’ along with measures of separation of
active slipbands proposed by the authors in (8) and the number of lattice
cells traversed during slip. The multiscale energetics of twolevel shears
deduced in (8) is shown to give rise to a response consistent with the
experimentally observed loading and unloading behavior
of a single crystal in G. I. Taylor’s soft device, as well as with the Portevin–le Chatelier effect. Such
behaviour is predicted through the occurrence of elastic material
instabilities at the level of active slip planes. The manifestation of such
phenomenon occurs thanks to the snapthrough of the loading point on a
stressstrain plot from one stable branch of a constitutive locus, namely a
stressstrain plot derived by the energy through simple differentiation, to
another one, resulting in jumps of the
loading point. The tunnelling of such a point through one or more stable
branches of the locus is shown to occur with dissipation. In summary, since such
jumps occur at a smaller length scale they predict an irreversible behaviour
whenever loading occur beyond a certain stress level and subsequent unloading
is considered, actually reproducing the observed plastic response for such
crystals. The jagged shape of the curve caused by the mentioned snapthrough
is consistent with Portevin–le Chatelier
effect. In particular, the initial
critical resolved shear stress, the flow stress, and the hardening response
are obtained, and an application to aluminium single crystals is displayed. This paper gives justice to a
famous sentence of J. Ericksen who foresaw that
plasticity may be explained with elastic material instabilities at a smaller
length scale. Henceforth this work puts solid and encouraging bases for a
more robust and general nonlinear theory of elasticity for nano/microstructured bodies
undergoing disarrangements such as slips, voids, etc. DESERI L., D. R. Owen. (2000). Active SlipBand
Separation and the Energetics of Slip in Single Crystals. INTERNATIONAL
JOURNAL OF PLASTICITY 16, 14111418. This research supports recent efforts to provide an energetic approach
to the prediction of stressstrain relations for single crystals
undergoing single slip and to give precise formulations of experimentally
observed connections between hardening of single crystals and separation of
active slipbands. Nonclassical, structured deformations in the form of
twolevel shears permit the formulation of new measures of the active
slipband separation and of the number of lattice cells traversed during
slip. A new and revealing formula is
obtained for the Helmholtz free energy per unit volume as a function of the
shear without slip, the shear due to slip, and the relative separation of
active slipbands in a single crystal. This formula is the basis for a model,
under preparation by the authors, of hardening of single crystals in single
slip that is consistent with the PortevinLe Chatelier effect and the existence of a critical
resolved shear stress. The approach adopted in this paper
may be generalized to more complex kinematical changes of the submacroscopic structure of metallic materials under
general states of stress. DESERI L., R. Mares. (2000). A Class of Viscoelastoplastic
Constitutive Models Based on the Maximum Dissipation Principle. MECHANICS OF
MATERIALS 32, 389403. In this paper, a class of viscoelastoplastic constitutive models, deduced from a
thermodynamically consistent formulation is presented. In particular, the
exploitation of a penalty version of the maximum dissipation principle leads
to a class of nonlinear
viscoelastoplastic equations which contains the
ones developed by Krempl and Yao (1987) on the one
hand, and Haupt and Korzen
(1987), Haupt and Lion (1993) among others. Unlike
the model discussed in Haupt and Lion (1993), for
the class of models derived in this paper the concept of intrinsic time
developed by Valanis (1971) is not used. History and
rate dependencies are incorporated through the constitutive model by the
concepts of equilibrium stress and overstress, respectively. In the previous
sections, it is shown that either in the limiting cases of high viscosity or
for extremely slow motions the constitutive model reduces to the one of the
equilibrium stress as expected. Further, a numerical analysis of the differential equations describing the viscoelastoplastic behavior in
the uniaxial case is investigated. The theoretical predictions obtained in
this case turn out to well describe the most important effects of the variation of strain rate for
stainless steels, such as abrupt changes during monotonic loading programs,
monotonic repeated relaxations, and cyclic loading programs at different strain rates. Applications to the viscoplasticity of metals and the extension of this
approach to severe strains may be fruitfully considered. DESERI L., G. Gentili AND M. J. Golden.
(1999). An Expression for the Minimal Free Energy in Linear Viscoelasticity.
JOURNAL OF ELASTICITY 54, 141185. Dealing with viscoelastic
materials, the problem of finding the explicit form of the maximum
recoverable work from a given state for all classes of such materials has
been an open problem from the late fifties, late sixties. The importance of
giving an answer to this question is easily understood if one qualitatively
refers to what is a physically the least available energy for the material which
is in a given state. Mathematically, this tantamounts
to saying that the free energy for the material is not unique and that the
minimum possible one has a lot of relevance. The problem above was only
characterized at the beginning of the seventies, although it was not yet
solved. This paper fully provides the
sought answer. Indeed., a general expression for the isothermal minimum free
energy of a linear viscoelastic material
is given in the frequency domain for the full general tensorial case. The method used here resides on a variational technique. However, the choice of functional
to maximize is motivated by showing the equivalence of some alternative
definitions of the maximum recoverable work. Moreover such a maximization in
the tensorial case relies crucially on certain
results due to Gohberg and Kre˘ın concerning the factorizability
of Hermitean matrices. The resultant expression is shown
to be a function of state in the sense of Noll, formulated in the context of
linear viscoelasticity by Del Piero and Deseri (1997). Moreover, it turns out to satisfy both the
above cited definitions of the free energy. The paper contains several and
fundamental results which could have led to several papers. Nevertheless,
they have been collected in this work and will be summarized below. Detailed, explicit formulae are
given for the material responses associated with particular classes of tensorial discrete spectrum models. In Section 3 the
constitutive relationship of the material is discussed, together with the
concept of state. In Section 4 the maximum recoverable work from a given
state is considered in detail. Factorization of a quantity closely related to
the tensorial loss modulus is considered in Section
5, which allows the determination of a general expression for the maximum
recoverable work in terms of Fourier transformed quantities in Section 6,
from a variational argument. A result on the
characterization of states in the sense of Noll for viscoelastic materials in the frequency
domain is proved in Section 7, with the aid of which the maximum recoverable
work is shown to be a function of the state. Since the minimum free energy m
is identified with the maximum recoverable work, the results of Sections 6
and 7 refer to m as well. In Section 8, the
expression found in Section 6 is shown to have the properties of a free
energy according to Graffi’s definition. In Section
9, such an expression is shown to be a free energy in the sense of Coleman and Owen, by using a
suitable norm on the space of the states. Various choices of norm, including
the free energy itself, are compared. Explicit results for particular
relaxation functions are presented in Section 10. Del Piero G., DESERI L. (1997). On the concepts of state and free energy
in linear viscoelasticity. ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS 138,
pp. 135. The analysis of the response of
viscoelastic solids is a very classical subject and a keystone of Solid Mechanics.
As usual, the constitutive law of linear viscoelasticity is the BoltzmannVolterra equation. Nevertheless,
long term hereditary materials, such as many classes of polymers, are used to
make components and structures. Such items are then subject to loading in a
time interval of observability, i.e. from a certain time on; very often
though the past strain history experienced by each point of the structure is
obviously not known. Obvsiouly the latter influences
on the overall response of the material, shielding its intrinsic relaxation
properties and, in turn, of the structure. The impossibility of knowing past
histories suggests that stress relaxation tests with no further loading may
reveal if long memory effects are
present in the mechanical component under exam. In other words, residual
stresses are expected to relax while measured for further and increasing
times. Roughly speaking a physical way to detect the effects of past
histories would be to characterize such residual stresses. Henceforth, separating
the contributions of the effects of the past history and of the actual
loading becomes crucial to predict and verify their overall response. Henceforth, while
using the BoltzmannVolterra equation, such a
separation may then be of great interest. In this
respect, an existing framework introduced by Noll in its context of ‘simple
materials’ (roughly speaking materials with local response) helps on going
towards that way to treat past and future information. Noll states that ``if
two states are di€erent . . . then there must be some
process which produces different stresses with the two states as initial states''. If we accept
this axiom, and
if we agree that in our case the processes are the continuations, we may
conclude that two histories whose difference produces zero residual stress
for all future times must correspond to the same state. If we assume
that the current deformation is independent of the past history, then we are
led to define a state as a pair whose entries are an equivalence class of
histories and a deformation. The deformation is the current deformation, and
two histories are equivalent if their difference produce the same
residual stress for all times. With these
definitions of process and state, we identify a system (in the sense of the
theory of Coleman and Owen), and we use the general results of that theory to
study some basic questions of linear viscoelasticity which have long been
debated by several authors. One of such question is the character ization of the state space. Unlike the
usual choice of historydeformation pair
there is, however, an important exception, that of the viscoelastic
materials of rate type, for which the relaxation function is a linear
combination of exponentials. For such materials, a state is usually
identified with a finite array of internal variables. Before this paper it
was not clear, however, whether this choice is a matter of convenience or is
dictated by some sort of general requirements. In the approach that we
present here, the possible definitions of a state are strictly limited by the
structure of the solution set of equation: Indeed, a state can be represented
by a historydeformation pair if and only if the solution set reduces to the
null history alone, so that the equivalence classes which constitute the first
entry of a state reduce to singletons. For a
relaxation function of exponential type, we show in Section 6 that the finite
dimensional characterization of a state is compatible with our defnition, while the characterization as a
historydeformation pair is not. This result
can be easily extended to all viscoelastic materials of rate type. We also
produce an example of a class of completely monotonic relaxation functions
for which the equivalence classes are singletons, and therefore the states
are correctly described by historydeformation pairs. Another
question which we consider here is that of the topology of the state space.
When a state is defined as a historydeformation pair, it is natural to define
the state space as the product of the space of histories and the space of
deformations, and to endow it with the product norm of the two spaces. The
norm chosen for the space of histories is usually the fading memory norm of Coleman
and Noll suggested by the physical consideration that the response of a material
with memory is more influenced by the deformations undergone in the recent
past than by those that occurred in the far past. In effect, as shown by the weaker
fading memory assumptions made by Volterra, Graffi and Day, a fading memory effect is implicit in the constitutive equation
(1.1), provided that the relaxation function decays to its equilibrium value
sufficiently
fast. The main reason for the success of the approach of Coleman lies in the farreaching consequences of the principle of the fading memory,
which is an assumption of continuity of the constitutive functionals
in the topology induced by the fading memory norm. Under this assumption,
many general properties of materials with memory have been proved, such as
some restrictions and interrelations for the constitutive functionals,
and the minimality of the equilibrium free energy in
the set of all states having the same current deformation. In this paper, in the more
limited context of linear viscoelasticity, we obtain the same results in a
more direct way. We endow the space of histories with a seminorm,
which is a norm for the set of the equivalence classes determined by the
histories solving the equation obtained by setting the residual stress to
zero for all times. The sum of this seminorm and
the norm of the space of deformations is a norm for the state space, and we
use the topology induced by that norm. This choice
plays an important role in the defnition of the
free energy, which is the central subject of the paper. Among the definitions
present in the literature, we focus our attention on the defnition
given by Coleman and Owen, who define the free energy as a lower potential
for the work. The general
results of their theory are then used to prove the existence of a maximal and
of a minimal free energy, characterized as the minimum work done to approach
a state starting from the natural state, and as the maximum work which can be
recovered from a given state, respectively. In the special case of linear
viscoelasticity, we found two additional properties beyond those shared by
all systems and by all free energies. Namely, we prove that every state can
be approached from every other state by a sequence of processes with the
property that the sequence of the works done in these processes is convergent,
and we prove that the minimal free energy is lower semicontinuous
with respect to the topology that we have adopted for the state space. The last two
sections are devoted to the study of two particular classes of viscoelastic
material elements, characterized by relaxation functions of exponential type
and by completely monotonic relaxation functions, respectively. For the first
class, we generalize a result of Graffi and Fabrizio, asserting that there is just one free energy,
whose explicit expression was determined by Breuer and Onate. We also show
that some other functions, which are usually considered as appropriate to
describe the free energy, are indeed not acceptable because they do not define
a function of state for this specific class of relaxation functions. 

