Enhancement of metal surface micro-jet by nanoscale helium bubbles under supported and unsupported shocks

By using molecular dynamics, we have investigated the effect of nanoscale helium (He) bubbles on formation micro-jets and various physical mechanisms under supported unsupported shock wave loading. Our simulations suggest that micro-jet is primarily influenced by local dynamics nano-He bubbles, as velocity in copper–helium (Cu–He) system slightly slower than pure Cu. The expansion He can accelerate jet head, but this disappears during released tensile stage. We categorize behavior into three types: Type A are forming region, their increases rupture jet. B located between micro-jets, compression rapid bursting free surface. C situated far from surface mainly affect propagation damage process. global effects bubble similar both However, evolution significantly different loading, with pressure-atom volume density attenuated to zero temperature reduced initial due strong effect. Overall, our study has revealed differences process dynamic compressed paths.