In order to extend the fatigue life of 7075 aluminum alloy joints, the stress distribution around the hole processed by cold expansion was simulated by ABAQUS. The finite element model of ultrasonic peening was established according to the kinetics analysis of ultrasonic shot peening process. In order to get the stress distribution around hole processed by cold expansion combined with ultrasonic shot peening, the ultrasonic shot peening process around the entrance surface of cold expanded joint hole was numerically simulated. Finally, the very high cycle fatigue test was carried out to validate the numerical calculation. The results show that the compound strengthening process can improve the stress distribution of the joint, inhibit the crack initiation and propagation, so it can improve the fatigue strength of the joints significantly.
基金资助:陕西省国际科技合作项目(2019KW–063)。
作者简介: 刘渊:硕士研究生,研究领域为大飞机连接疲劳寿命及强化技术。
引用本文:
刘渊,薛红前,靳泓睿,高国强. 7075铝合金连接孔复合强化数值模拟及疲劳试验研究[J]. 航空制造技术, 2019, 62(21): 52-58.
LIU Yuan, XUE Hongqian, JIN Hongrui, GAO Guoqiang. Numerical Simulation and Fatigue Experiment of 7075 Aluminum Alloy Joint Holes Processed by Compound Strengthening Technology. Aeronautical Manufacturing Technology, 2019, 62(21): 52-58.