Molecular dynamics simulation of shock wave propagation and spall failure in single crystal copper under cylindrical impact

Abstract

Abstract The shock premelting and spallation of single crystal copper under cylindrical converging impact are studied using molecular dynamics simulations. For the axis of a cylindrical potential wall along the [001] crystallographic direction, the anisotropy of shock response is very obvious at the shock strength 1.4 km s−1. Premelting occurs at the wavefront in the 〈110〉 direction, but not in the 〈100〉 direction. As a result of the converging effect, the requisite shock strength for generating premelting decreases in comparison with planar shock. Under the interaction of reflected wave and unloaded wave, the nucleation of spallation occurs in premelting tensile regions.