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

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.

Automated summary

The shock premelting and spallation of single crystal copper under cylindrical converging impact were studied using molecular dynamics simulations. The anisotropy of shock response is significant at a specific shock strength, with premelting mainly occurring in specific crystallographic directions.