中文摘要：

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。

英文摘要：

The paper focuses on the influencing parameters to the plastically affected depth and maximum residual stress in the metallic target after laser shock processing.Firstly,the dimensional analysis method is employed to find the controlling parameters,and the relationships of plastically affected depth,maximum residual stress versus peak pressure,pressure duration and laser spot size are given.Secondly,a two-dimensional axisymmetric finite element model based on LS-DYNA package is built,and the dynamic responses of metallic target subject to laser shock processing are computed with different input parameters.The result shows that the plastically affected depth is proportional to pressure duration,and the maximum residual stress is independent with it,but both of them are not affected by laser spot size within a certain range,while they have approximate linear relationship with peak pressure after reaching to a certain level.