Effect Of Shot Peening On Fatigue Properties Of 713Al-Zn Alloy Containing Micropore On The Surface

Shot peening technology can significantly improve the fatigue properties of materials.In this paper,the residual stress distribution,plastic strain state and fatigue crack initiation of the micropores were analyzed by means of numerical simulation.The effects of shot peening parameters,shot peening rate,shot diameter and shot peening parameters on the microstructures And the influence of the micropores on the relative position of the material surface was discussed.The effects of shot peening rate,projectile diameter and shot peening time on the residual stress distribution around the hole are analyzed by numerical simulation.The effects of shot peening parameters and shot peening parameters on the residual stress distribution around the hole are analyzed.And the distribution of the residual stress in the shot peening direction was obtained.The diameter of the crater after shot peening was the same as that of the shot peening And the equivalent plastic strain value in the shot peening direction is lower than the equivalent plastic strain value on the shot peening surface under the same conditions.The linear elastic finite element model of the material after shot peening is established.The influence of microvoid deformation on the maximum stress concentration coefficient is analyzed.The variation law of the maximum stress concentration coefficient is obtained,and the maximum stress concentration coefficient is obtained under the study Relative to the best shot parameters.Finally,the influence of residual stress and hole deformation on fatigue crack initiation life and the combined effect of residual stress and hole deformation on fatigue crack initiation life are analyzed respectively,and compared with those of shot peening.Multiple relationship.In this paper,the actual production of cast aluminum alloy for micropores defects in shot peening process provides a certain reference value.