为了研究不同功率密度对激光冲击诱导的残余主应力及其方向的影响,采用5种不同功率密度对2024铝合金进行冲击,用X射线应力分析仪测量3个方向的残余应力,计算出残余主应力及其方向。结果表明,激光功率密度对冲击区域的残余主应力幅值、主应力方向角的分散程度、应力强度及最大切应力有影响;对于2024铝合金,功率密度为2.8GW/cm2时,残余最大主应力的方差为1987,主应力方向角的方差为13905,残余应力分布均匀,主应力方向角分散,但残余最大主应力的均值为-158MPa;功率密度为2.1GW/cm2时,残余最大主应力的均值为-239MPa,冲击区域的残余应力值最大,但残余最大主应力的方差为5471,残余应力分布均匀性差。 In order to study the effects of different power densities on residual principal stress and its direction induced by laser shock, 2024 aluminum alloy was impacted by 5 different power densities, residual stresses in 3 directions were measured by X-ray stress analyzer, Stress and its direction. The results show that the laser power density has an impact on the residual principal stress amplitude, the dispersion degree of the principal stress direction angle, the stress intensity and the maximum shear stress in the impact region. For the 2024 aluminum alloy, the power density of 2.8GW / cm2 is the largest The variance of stress is 1987, the variance of main stress direction angle is 13905, the distribution of residual stress is uniform, the direction angle of principal stress is dispersed, but the mean residual maximum principal stress is -158MPa. When the power density is 2.1GW / cm2, the residual maximum principal stress The average value of -239MPa, the impact of the region’s maximum residual stress, but the residual residual maximum principal stress of 5471, the residual stress distribution is poor.