Spall in Aluminium with Helium Bubbles under Laser Shock Loading**Supported by the Science Foundation of China Academy of Engineering Physics under Grant No 9090702.

Abstract

The spallation behaviors of Al+0.2 wt% B targets and neutron irradiated Al+0.2 wt% B targets with 5 nm radius helium bubble subjected to direct laser ablation are presented. It is found that the spall strength increases significantly with the tensile strain rate, and the helium bubble or boron inclusions in aluminum reduces the spall strength of materials by 34%. However, slight difference is observed in the spall strength of unirradiated samples compared with the irradiated sample with helium bubbles.