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<p>In order to accurately predict the residual stress distribution in the surface layer of a laser shock peened Mg-3Nd (wt%) alloy, this study combined experimental measurements with numerical simulations to determine the Johnson–Cook (J-C) constitutive model parameters for the alloy. Based on the calibrated model, multi-point laser shock peening processes were simulated to investigate the effects of laser energy, pulse width and plate thickness on the residual stress distribution. The results indicate that the simulated residual stresses agree well with the experimental trends when the J-C parameters are set as follows: <i>A</i> = 81&#xa0;MPa, <i>B</i> = 1094.6&#xa0;MPa, <i>n</i> = 0.863 and <i>C</i> = 0.112. The simulations show that increasing the laser energy enhances the compressive residual stress (CRS) on the surface and in the subsurface layers, whereas increasing the pulse width reduces the CRS. When examining the effect of plate thickness, it was found that a 2&#xa0;mm thick plate exhibits compressive residual stresses throughout its entire depth after laser shock peening. As the plate thickness increases to 3, 4 and 5&#xa0;mm, the depth of the CRS-affected layer is 1.36, 1.37 and 1.38&#xa0;mm, respectively.</p>

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Investigation of Residual Stress in Mg-3Nd Alloy Induced by Laser Shock Peening via Experiment and Numerical Simulation

  • 期刊论文

  • 发表日期：

    2025年10月20日

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  • Yuanqing Chi,
  • Zihan Chen,
  • Bingbing Wen,
  • Yang Tang,
  • Yongkang Zhang,
  • Shupeng Cai

摘要

In order to accurately predict the residual stress distribution in the surface layer of a laser shock peened Mg-3Nd (wt%) alloy, this study combined experimental measurements with numerical simulations to determine the Johnson–Cook (J-C) constitutive model parameters for the alloy. Based on the calibrated model, multi-point laser shock peening processes were simulated to investigate the effects of laser energy, pulse width and plate thickness on the residual stress distribution. The results indicate that the simulated residual stresses agree well with the experimental trends when the J-C parameters are set as follows: A = 81 MPa, B = 1094.6 MPa, n = 0.863 and C = 0.112. The simulations show that increasing the laser energy enhances the compressive residual stress (CRS) on the surface and in the subsurface layers, whereas increasing the pulse width reduces the CRS. When examining the effect of plate thickness, it was found that a 2 mm thick plate exhibits compressive residual stresses throughout its entire depth after laser shock peening. As the plate thickness increases to 3, 4 and 5 mm, the depth of the CRS-affected layer is 1.36, 1.37 and 1.38 mm, respectively.