采用Abaqus软件建立有限元模型,分析了激光功率密度对孔周表面残余主应力分布的影响。进行了不同功率密度下的激光喷丸(LP)试验,通过X射线应力分析仪测量了孔周区域特征点三个方向的残余应力值,并计算了各点对应的主应力。结果表明,LP之后孔周的残余应力呈现各向异性;最小残余主应力可有效表征喷丸强化效果,随着激光功率密度的提高,最小残余主应力值减小。另外,LP后小孔附近出现典型的残余压应力环,最小残余主应力明显小于其他喷丸区域的;当功率密度超过一定阈值时,此环呈现远离孔壁的趋势。 The Abaqus software was used to establish the finite element model, and the influence of laser power density on the residual principal stress distribution on the perimeter of the hole was analyzed. The laser shot peening (LP) test under different power densities was carried out. The residual stress values ​​in three directions of characteristic points in the perimeter of the hole were measured by X-ray stress analyzer, and the principal stress corresponding to each point was calculated. The results show that the residual stress of perforation is anisotropic after LP. The minimum residual stress can effectively reflect the effect of shot peening. As the laser power density increases, the minimum residual stress decreases. In addition, a typical residual compressive stress ring appears near the pinhole after LP, and the minimum residual stress is obviously smaller than that of other shot peening zones. When the power density exceeds a certain threshold, the ring tends to stay away from the pore wall.