摘要
以延长7075铝合金连接件疲劳寿命为目的,使用ABAQUS有限元软件模拟分析冷挤压孔强化对孔周应力分布的影响。结合超声喷丸弹丸动力学分析结果,建立超声喷丸有限元模型,数值模拟了冷挤压强化孔挤入端表面超声喷丸强化过程,分析了孔挤压强化与表面超声喷丸复合强化对7075铝合金连接孔周应力的影响,并通过超高周疲劳试验验证。结果表明:复合强化可以改善连接孔周的应力分布情况,抑制孔角裂纹的萌生和疲劳裂纹的扩展,因而能显著提高连接孔的疲劳寿命。
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.
作者
刘渊
薛红前
靳泓睿
高国强
LIU Yuan;XUE Hongqian;JIN Hongrui;GAO Guoqiang(School of Mechanical Engineering,Northwestern Polytechnical University,Xi'an 710072,China;AVIC Xi'an Aircraft Industry(Group)Co.,Ltd.,Xi5an 710089,China)
出处
《航空制造技术》
2019年第21期52-58,68,共8页
Aeronautical Manufacturing Technology
基金
陕西省国际科技合作项目(2019KW–063)
关键词
连接件
孔挤压强化
疲劳寿命
超声疲劳
超声喷丸
Joints
Cold expansion process
Fatigue life
Ultrasonic fatigue
Ultrasonic shot peening
