Failure
A “catastrophic,” (i.e., sudden) type of failure occurs in aluminum alloys, as suggested by failure immediately after the so-called Considere Criterion is reached. Mechanisms of failure involve significant changes in microstructure and the corresponding evolution of macroscopic material properties. The crystal plasticity finite element method (CPFEM) approach can incorporate the full richness of localized deformation (that leads to failure), since it can account for grain morphologies (i.e., shape, size) and grain interactions.
This approach, coupled with mechanism-driven hardening and internal state variables (ISV) models, provides a powerful new failure model for aluminum alloys that will extend the numerical framework presented by Inal’s research group. The model accounts for mean slip path, stored energy of dislocations and dynamic annihilation of created dislocations.