In order to evaluate the effect of laser shock peening,the residual stress distribution of workpieces is usually measured by the X-ray diffraction method(XRD).Since the penetration depth of X-ray is in the range of micrometer,in order to obtain the distribution of residual stress in depth,the surface materials are often stripped layer by layer by the electrolytic polishing method.Layer-stripping process changes the boundary conditions of workpiece surface,so the distribution of residual stress is changed.The residual stress value obtained by the XRD experiment is not the same as that without layer-stripping.In this paper,finite element numerical simulation method is adopted to study the effect of layer-stripping process on the distribution of residual stress induced by laser.The result shows that:in the compressive residual stress region,the compressive residual stress value after stripping is greater than that without stripping,and compressive residual stress of the material increases with the stripping depth increases;there will be little influence on the residual stress distribution if the stripped layer is shallow.It will be conducive to the elimination of the "residual stress hole" by laser shock peening.This research has theoretical significance to the correction of residual stress based on the XRD experiment.
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赵洁,聂祥樊,臧顺来.逐层剥离对激光诱导残余应力场影响的数值模拟[J].激光与红外,2014,44(2):140~144 ZHAO Jie, NIE Xiang-fan, ZANG shun-lai. Numerical simulation of the effect of layer stripping on the laser-induced residual stress field[J]. LASER & INFRARED,2014,44(2):140~144