激光参数对圆杆件残余应力场影响的数值模拟

利用三维有限元技术模拟预测激光单次冲击圆杆件诱导的残余应力场，并与实验结果比较，残余应力场的预测值与实验测量值一致性较好。探讨了激光功率密度、冲击角度以及冲击次数等激光参数对残余应力场的影响。结果表明，在激光冲击圆杆件过程中，激光功率密度越大，光斑中心区域的残余压应力越小，残余应力状态最终由残余压应力变为残余拉应力；光斑中心区域的残余压应力随冲击角度的增大而增大；冲击次数在一定阈值范围内时，光斑中心的残余压应力增幅显著，之后逐渐趋于饱和。塑性强化层深度随激光功率密度和冲击次数的增加而增大，激光冲击角度对塑性强化层深度几乎没有影响。

Abstract

A three dimensional finite element model is established to estimate the residual stress field induced by single laser shock processing (LSP) in aluminum alloy round rod part. The simulation results are consistent with the experimental results. The effect of laser parameters including laser power density, shock angle and shock times on residual stress field is systematically investigated with the aid of the established model. The results show that during the laser shocking of round rod, larger laser power density causes smaller compressive residual stress in the central spot area. The compressive residual stress in the center area turns into tensile residual stress with the increase of laser power density, and increases with the increasing shock angle. Moreover, the compressive residual stress at the spot center increases significantly under certain impact times and gradually reaches saturation. The plastically affected depth increases with the increase of laser power density and shock times, and is almost not affected by the shock angle.

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汪静雪, 章艳, 张兴权, 戚晓利, 裴善报, 陈彬. 激光参数对圆杆件残余应力场影响的数值模拟[J]. 中国激光, 2016, 43(8): 0802007. Wang Jingxue, Zhang Yan, Zhang Xingquan, Qi Xiaoli, Pei Shanbao, Chen Bin. Numerical Simulation of Residual Stress Field Induced in Round Rod Part Affected by Laser Parameters[J]. Chinese Journal of Lasers, 2016, 43(8): 0802007.

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