Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Approximate residual stress and plastic strain profiles for laser-peened alloy 600 surfaces

  • Eui-Kyun Park (Mechanical Engineering, Korea University) ;
  • Hyun-Jae Lee (Mechanical and System Engineering, Korea Military Academy) ;
  • Ju-Hee Kim (Mechanical and System Engineering, Korea Military Academy) ;
  • Yun-Jae Kim (Mechanical Engineering, Korea University)
  • Received : 2022.08.01
  • Accepted : 2022.12.08
  • Published : 2023.04.25
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Abstract

This paper presents approximate in-depth residual stress and plastic strain profiles for laser-peened alloy 600 surface via FE analysis. In approximations, effects of the initial welding residual stress and the number of shots are quantified. Based on FE analysis results, residual stress profiles are quantified by two variables; the maximum difference in stress before and after LSP, and the depth up to which the compressive residual stress exists. Plastic strain profiles are quantified by one variable, the maximum equivalent plastic strain at the surface. The proposed profiles are validated by comparing with published LSP experimental results for welded plates. Effects of the initial welding residual stress and the number of shots on these variables are discussed. The proposed profile can be directly applied to predict the mitigation effect of LSP on PWSCC and to efficiently perform structural integrity assessment of laser peened nuclear components.

Keywords

Acknowledgement

This work was supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20206500000010).

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