Shock response and defect evolution of copper single crystals at room and elevated temperatures

Abstract

Shock compression behaviors of copper single crystals at room and elevated temperatures are investigated by molecular dynamics simulations. The results show that when increasing the initial temperature, the kinetic energy part of stress increases while the potential energy part of stress decreases; the shear strain and the density of defects decrease while the magnitude of temperature rise increases. To understand the effect of initial temperature on the shock response, the evolutions of dislocations under different initial temperatures are studied in detail. Finally, the effect of initial temperature on quasi-static compression behavior is also investigated and analyzed.