Assistant Professor of Solid and Structural Mechanics

Experimental and analytical insights on fracture trajectories in brittle materials with voids

Analytical models have been developed for fracture propagation over the last several decades and are now considered with renewed interest; the range of their applicability varies for different materials and different loading conditions. Systematic experimental measurements are presented against an asymptotic prediction for the crack trajectory developing in solids with small voids(of circular and elliptical shape). The experiments also cover the dynamic regime, where new features involving crack kinking and roughness of the fracture surface occur.

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Experiments on fracture trajectories in ceramic samples with voids

Experimental validation is provided for a linear elastic model describing the trajectory of a crack which propagates under Mode I conditions in a ceramic sample, as influenced by non interacting voids. A wide range of experiments were performed by quasi-static loading standard notched unglazed ceramic samples under pure Mode-I loading conditions. It is found that the predicted crack trajectories are in close agreement with the experimental results, so that the model is fully validated and therefore permits correct simulations of crack paths in brittle materials containing small voids.

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