Energy storage under high-rate compression of single crystal tantalum

When a material is plastically deformed the majority of mechanical work dissipated as heat, and fraction plastic converted into heat known Taylor-Quinney coefficient (TQC). Large-scale molecular dynamics simulations were performed high strain rate compression single-crystal tantalum, resulting integral differential TQC values are reported up to true strains 1.0. A phenomenological model proposed for energy stored in function time with an asymptotic limit this defined by deformation conditions. The reasonably describes convergence 1.0 increasing strain, but does not directly address physical nature thermo-mechanical conversion. This instead developed second more detailed that accurately accounts storage two distinct contributions, one being growing dislocation network other point defect debris left behind moving dislocations. contribution found lag be substantial under high-rate straining conditions considered here.