This paper proposes a numerical simulation method of laser shock peening process in Alloy600 penetration nozzles in pressurized water reactor. To simulate propagation of pressure pulse wave into metallic target, the LSP simulation was performed by explicit dynamic analysis using commercial software ABAQUS. In the LSP simulation, strain rate dependent stress-strain relationship with isotropic hardening model and hydrodynamic behaviour model were considered for Alloy600 material. The pressure pulse loading condition as a function of time and geometry was applied by using user-subroutine VDLOAD. To validate the LSP simulation method, we simulated the LSP experiments for Alloy 600 specimens with Q-switched ND:YAG laser performed by Toshiba. Finally, we present FE results about the LSP effects on initial residual stresses for welding residual stress of Alloy 600 penetration nozzle.
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