Evaluation of void nucleation, growth, and coalescence parameters for HCP-Zr at extreme strain rates

Void nucleation, growth, and coalescence at extreme strain rates in ductile metals with weak mechanical anisotropies, e.g., copper, iron, aluminum, have been extensively investigated. However, the atomic-scale fracture properties of strongly anisotropic metals, especially hexagonal close-packed (HCP) ultrahigh rarely studied. We investigated voids HCP-Zr under isotropic-triaxial tension using molecular dynamics (MD) void nucleation growth (NAG) models. The effects temperature were also examined by MD. evolution predicted MD corresponded to that NAG model is divided into three stages, i.e., an initial stage, exponential a linear stage. threshold Pn0 very sensitive temperature, while Pg0 decreases slightly increasing temperature. parameters evaluated improved optimized genetic algorithm. In addition, we adjusted until history volume fraction calculated these was exactly same as This study predicts comprehensive for conditions, providing valuable reference future studies dynamic damage HCP materials.