On the importance of strength in phase-field models of dynamic, brittle fracture
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Recently, Kumar et al. [1] proposed and revised a phase-field approach for the nucleation and propagation of fracture under arbitrary quasistatic loading conditions. The model accounts for an arbitrary material strength surface through an external driving force in the evolution equation for the phase-field. In this talk, we extend this model through the addition of inertial forces. The dynamic version of the model is then validated against a broad range of benchmark experiments for dynamic brittle fracture, including the experiments by Kalthoff and Winkler, the Brazilian fracture test, and a recent experiment investigating crack initiation, propagation and branching in soda-lime glass specimens [2]. Numerical simulations illustrate the proposed dynamic phase field model provides reasonable results compared to experimental observations and a cohesive phase field model by Geelen et al [3].
