多铆钉自冲铆试件的力学性能和失效形式  

Mechanical properties and failure modes on SPR specimens with multiple rivets

作　　者：张奥 肖钢 赵伦 李激光[2] 叶凯 张昊含 张兰 卢杰豪 hang Ao;Xiao Gang;Zhao Lun;Li Jiguang;Ye Kai;Zhang Haohan;Zhang Lan;Lu Jiehao(Institute of Ultrasonic Technology,Shenzhen Polytechnic University,Shenzhen 518055,China;Faculty of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China;Mechanical and Electrical Engineering Faculty,Yunnan Open University,Kunming 650599,China)

机构地区：[1]深圳职业技术大学超声技术研究所,广东深圳518055 [2]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [3]云南开放大学机电工程学院,云南昆明650599

出　　处：《锻压技术》2024年第8期132-137,共6页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(12104324);深圳职业技术大学高端人才科研启动项目(6022310046k);深圳职业技术大学博士后出站后期资助项目(4103-6023271014K1);深职大-新栋力超声波焊接技术研发中心项目(602331009PQ)。

摘　　要：为探究铆钉数量及排布对AA5052铝合金自冲铆试件力学性能和失效形式的影响,制备9种铆钉数量和2种不同铆钉排布共15组自冲铆试件。通过拉伸-剪切试验得到试件的峰值载荷和能量吸收值,并进行对比,分析试件的力学性能;分析试件的宏观失效形式,并采用扫描电子显微镜对断口进行观察,分析其失效机理。结果表明:铆钉数量会影响试件的力学性能和失效形式,铆钉排布仅影响试件的力学性能。试件的峰值载荷和能量吸收值随铆钉数量的增大先增大后减小;铆钉数量相同时,铆钉纵向排布的试件可以获得更好的力学性能。铆钉数量<6时,试件的失效形式为铆钉拔出,越靠近板材的边缘,铆钉对板材的破坏程度越大;铆钉数量≥6时,试件的失效形式为板材断裂并且断口处有大量韧窝,越靠近铆钉,韧窝越浅且越小。To investigate the influence of rivet quantity and arrangement on the mechanical properties and failure modes of AA5052 aluminum alloy self-piercing riveting(SPR)specimens,fifteen sets of SPR specimens with nine types of rivet quantity and two types of rivet arrangements were prepared.The mechanical properties of the specimens were analyzed by comparing the peak load and energy absorption values of the specimens obtained from the tensile and shear experiment.Then,the macroscopic failure mode of the specimens were analyzed,and the fracture was observed by SEM to research the failure mechanism of the specimens.The results show that the rivet quantity affects both the mechanical properties and failure mode of the specimens,while the rivet arrangement only affects the mechanical properties of the specimen.The peak load and energy absorption values of the specimens increase first and then decrease with the increasing of the rivet quantity.When the rivet quantity is same,the specimen with rivet longitudinal arrangement can achieve better mechanical properties.When the rivet quantity is less than six,the failure mode of the specimen is rivet pulling out,and the closer it is to the edge of the sheet,the greater the damage of the rivet to the sheet.When the rivet quantity is equal to or greater than six,the failure mode of the specimen is fracture of sheet with a large number of ductile dimples at the fracture,and the closer to the rivets,the shallower and smaller the ductile dimples.

关 键 词：自冲铆接 铆钉数量 铆钉排布 峰值载荷 能量吸收值 失效形式 

分 类 号：TH131.1[机械工程—机械制造及自动化]