Simulation Study on Laser-Induced Spallation in Aluminum

The occurrence of spall in target caused by laser-driven shock wave depends on the power density of the beam, the induced pressure pulse duration, the target thickness and the target material parameters. The propagation attenuation of a triangular compressive wave and the time-dependence of spallation are discussed in this paper. Based on the gas-gun experimental simulation technique, an incident laser with power density of 103 W/cm2 and energy density of 103 J/cm2 was proposed as the threshold for causing spallation in LY-12 Al target with a thickness of 2 mm.