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考虑激光冲击强化后塑性区深度及最大残余压应力的影响因素和影响规律问题,运用量纲分析的方法获得了影响冲击强化效果的主控因素,并给出了塑性区深度及最大残余压应力与峰值压力、压力持续时间、光斑半径的关系;利用基于LS-DYNA的二维轴对称有限元模型,计算了不同参数条件下金属靶体受冲击载荷作用的动态响应。计算结果表明,塑性区深度与压力持续时间成正比;最大残余压应力与压力持续时间无关;一定光斑半径范围内,塑性区深度及最大残余压应力与光斑半径无关;峰值压力超过一定值时,塑性区深度及最大残余压应力与峰值压力近似成线性关系。
Considering the influencing factors and influencing rules of the plastic zone depth and the maximum residual compressive stress after laser shock strengthening, the main controlling factors affecting the impact strengthening effect were obtained by the method of dimension analysis. The relationship between the depth of plastic zone and the maximum residual compressive stress And the relationship between peak pressure, pressure duration and spot radius. The dynamic response of metal target subjected to impact load under different parameters was calculated by using two-dimensional axisymmetric FEA model based on LS-DYNA. The results show that the depth of the plastic zone is proportional to the pressure duration. The maximum residual compressive stress is independent of the pressure duration. The depth of the plastic zone and the maximum residual compressive stress have no relation with the spot radius within a certain spot radius. When the peak pressure exceeds a certain value, The plastic zone depth and the maximum residual compressive stress are approximately linear with the peak pressure.