加载角度对6082铝合金自冲铆接接头疲劳性能及失效模式的影响  

Influences of Loading Angle on Fatigue Characteristics and Failure Modes of Self-piercing Riveted Joints in Aluminum Alloy 6082

作　　者：雷付煜 徐小旭 赵亚明 罗军 马超 徐从昌[1] 李落星[1,3] LEI Fuyu;XU Xiaoxu;ZHAO Yaming;LUO Jun;MA Chao;XU Congchang;LI Luoxing(College of Mechanical and Vehicle Engineering,Hunan University,Changsha,410082;AVATR Technology Co.,Ltd.,Chongqing,401120;Research Institute of Hunan University in Chongqing,Chongqing,401121)

机构地区：[1]湖南大学机械与运载工程学院,长沙410082 [2]阿维塔科技有限公司,重庆401120 [3]湖南大学重庆研究院,重庆401121

出　　处：《中国机械工程》2025年第1期141-151,共11页China Mechanical Engineering

基　　金：国家自然科学基金(52272362);重庆市技术创新与应用发展专项重点项目(CSTB2022TIAD-KPX0035);湖南创新型省份建设专项(2021GK4044)。

摘　　要：以6082铝合金自冲铆接为研究对象,采用拉伸试验、疲劳试验、扫描电镜观测等手段研究了接头疲劳裂纹扩展机理和微动磨损行为。结果表明:相较于0°、45°,加载角度90°的接头具有最优的静力学性能;在同一载荷水平下,接头疲劳寿命随加载角度的增大而增大;高周疲劳下的接头失效为下板开裂失效,低周疲劳下的接头失效为上板开裂和铆钉断裂;微动磨损影响接头疲劳裂纹的萌生位置和扩展路径,接头加载角度影响接头不同区域的微动磨损程度,加载角度90°的铆钉头部与上层板接触区域、加载角度0°的下板与铆钉腿表面接触区域的微动磨损最严重。Taking the self-piercing riveting of 6082 aluminum alloy as the research object,the fatigue crack propagation mechanism and fretting wear behavior of the joints were studied by tensile tests,fatigue tests and scanning electron microscopy.The results show that compared to the 0°and 45°,the joint has the best static mechanics properties under the loading angle of 90°.Under the same load level,the fatigue life of the joints increases with the increase of the loading angles.Under high-cycle fatigue,the joints fail by cracking of the lower plate,while under low-cycle fatigue,the joints fail by cracking of the upper plate and rivet fracture.Fretting wear affects the location and propagation path of the fatigue crack initiation in the joints,and the loading angles of the joints affect the fretting wear in different areas of the joints.Under the loading angle of 90°,the fretting wear in the contact areas between rivet head and upper plate is the most serious.Under the loading angle of 0°,the fretting wear in the contact areas between lower plate and surface of the rivet leg is the most serious.

关 键 词：铝合金 自冲铆接 加载角度 疲劳性能 微动磨损 

分 类 号：TH131.1[机械工程—机械制造及自动化]