Abstract
Dynamic stress wave processes in targets driven by laser-induced plasma determines the mechanical performance of the targets during laser shock peening. In this paper, an optically transparent material is used as a target to detect the distribution of stress waves in situ. Laser-induced plasma and corresponding stress waves are quantitatively analyzed based on interference imaging technology. The evolution of the plasma and stress waves for different laser temporal profiles is studied. The tensile stress in the lower density region behind the main shock front is directly observed. The experimental results show that the laser-induced plasma’s development mode can be significantly changed by adjusting the input laser pulse’s time profile. At the same time, the tensile stress in the lower density region behind the main shock front is reduced, which attenuates the positive effect of laser shock peening.
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