Modeling of hardening at very high strain rates

A modification of the Bodner–Partom elastic-viscoplastic constitutive model is proposed to account for strain rate dependence of the evolution of hardening. The suggested procedure is for the rate of hardening in the hardening evolution equation to be a direct function of total strain rate. Material constants are determined for oxygen-free-electronic copper and simulations of response behavior at very high rates of straining appear to be consistent with test observations.