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采用有限元方法对三维平顶光束激光冲击2024铝合金进行数值模拟,模拟结果与文献中的实验结果吻合。研究了不同工艺参数对材料残余应力场分布的影响。结果表明,随着光斑尺寸的增大,材料的残余应力增大,而表面残余应力的变化梯度减小;随着冲击次数的增加,残余应力增大并趋于饱和;当搭接率为10%时,表面残余应力的变化梯度较小;随着搭接率的增加,深度方向残余应力增加但增幅较小。
The finite element method was used to simulate 2024 aluminum alloy with three-dimensional flat-top laser beam laser shock. The simulation results are in good agreement with the experimental results in the literature. The influence of different process parameters on the distribution of residual stress field was studied. The results show that with the increase of spot size, the residual stress increases and the gradient of residual stress decreases. With the increase of impact times, the residual stress increases and tends to be saturated. When the overlap rate is 10 %, The variation gradient of surface residual stress is small. With the increase of the lap rate, the residual stress in the depth direction increases but decreases slightly.