喷丸引入的残余压应力场可以有效地提高材料的疲劳抗性，但该残余应力并非一成不变，其在循环载荷作用下的松弛特性会减少喷丸对材料疲劳抗性的增益效果． 为了快速、便捷地得到稳定状态的喷丸残余应力场，文中建立了一种用于预测循环载荷下喷丸残余应力松弛的数值方法，应用该方法成功得到了7075 铝合金试样在不同喷丸强度及载荷强度下的稳定残余应力场，仿真结果与采用X 射线衍射法得到的实验结果相吻合，从而验证了该数值方法的正确性． 采用该数值方法，文中还进一步研究了疲劳载荷循环次数、应力比、初始残余应力场及喷丸引入的塑性应变等因素对喷丸残余应力松弛的影响．

The residual compressive stress field induced by shot peening can effectively improve the fatigue resistance of materials.However,the residual stress isn't constant,and its relaxation phenomenon caused by cyclic loading will reduce the effects of the shot peening on the fatigue resistance of materials.In order to conveniently and quickly achieve a residual stress field in a stable state,a numerical method to predict the residual stress relaxation under cyclic loading is proposed,and then it is used to achieve the stable residual stress fields of 7075 aluminum alloy specimens under different shot peening intensities and different load strengths.It is found that the simulation results accords well with the experimental results obtained through X-ray diffraction method.Thus,the correctness of the proposed numerical method is verified.In addition,the proposed numerical method is also applied to revealing the influences of the cycle numbers of loading,the stress ratios,the initial residual stress field and the plastic strains caused by the shot peening on the residual stress relaxation induced by the shot peening.