Cohesive zone modeling of crack kinking out of an interface

Abstract eng:
This paper examines a modified cohesive zone approach to model crack kinking out of an interface. Here, for the first time, cohesive zone models are shown to accurately predict crack kinking without any assumption of crack growth direction. Key dimensionless mesh parameters are identified that control the critical initiation of a simulated crack, and the results are shown to be in excellent agreement with the results of He and Hutchinson [l] in the limit of a refined mesh. The simulation results correctly predict both the kink angle and critical ERR of the parent crack in the case of homogeneous bulk/interface toughness. However, the simulations predict a different transition between kinking and interface delamination for a non-homogeneous bulk & interface toughness. The method is applied to simulate the response of a film/substrate system subjected to a femtosecond laser pulse, with the resulting failure mechanisms a natural outcome of the simulation.

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