摘要
为了研究铝/钢异种金属的铆接性能,利用Deform-2D有限元软件建立半空心铆钉自冲铆接有限元模型,对铝/钢自冲铆接成形工艺过程及应力分布情况进行分析。对AA5052铝合金和SPFC440高强钢异种金属进行半空心铆钉自冲铆接试验,并对自冲铆接头进行拉伸试验和疲劳试验,分析自冲铆接头力学性能和接头失效形式。结果表明:铆钉头部和上板料接触良好,铆钉胫在下板料中向四周均匀顺滑扩展开,没有裂纹和弯曲;铆钉应力集中在铆钉胫上端,下板应力集中在铆钉脚与下板接触区域。模拟结果与试验值之间的相对误差均在13%以内,数值模拟可以较好的反映自冲铆接实践,满足工程设计精确度要求。自冲铆接头具有较好的静拉伸性能和疲劳性能。静拉伸载荷最大值可达7.6 kN。在拉伸载荷作用下,上板发生翘曲变形,铆钉从下板中拉脱。试验条件下疲劳极限约为2.3 kN。在疲劳加载过程中,铝板在微动磨损和拉应力的共同作用下发生疲劳破坏。
A finite element model of self-piercing riveting of semi-tubular rivets was established by using the finite element software Deform-2D. The process of self-piercing riveted dissimilar metals of aluminum and steel was simulated and analyzed, and the stress distribution on rivets and metal sheets was analyzed. The self-piercing riveted tests and static tensile tests of AA5052 aluminum alloy and SPFC440 high strength steel dissimilar metals were carried out. The self-piercing riveted experiment of semi-tubular rivets for aluminum/steel dissimilar metals was performed. Tensile test and fatigue test were carried out to analyze mechanical properties of self-piercing riveted joint. The failure forms of the riveted joint are analyzed. The results show that the rivet head has good contact with the upper sheet, and the rivet shank spares evenly and smoothly in the lower sheet without crack or buckling. The stress of the rivet concentrates on the rivet shank, and the stress of the bottom sheet concentrates on the contact area between the rivet foot and the lower sheet. The results of numerical simulation and self-piercing riveted test are in good agreement. The relative error between simulation and test values is less than 13%, which meets the requirement of engineering design accuracy. The self-piercing riveted joint has good static tensile property and fatigue property. The maximum load of static tensile test is about 7.6 kN. The upper sheet warps and the rivet foot is pulled out from the lower sheet under the tensile load. The fatigue limit is about2.3 kN under experimental conditions. In the process of fatigue loading, the aluminum alloy suffered fatigue failure under the combined action of fretting wear and tensile stress.
作者
周泽杰
黄志超
李绍杰
Zhou Zejie;Huang Zhichao;Li Shaojie(School of Materials Science and Engineering,East China Jiaotong University,Nanchang 330013,China;Research and Development Institute of Automotive Engineering Technology,Chery Automobile Co.,Ltd.,Wuhu 241007,China)
出处
《华东交通大学学报》
2022年第4期84-93,共10页
Journal of East China Jiaotong University
基金
国家自然科学基金资助项目(51875201)
江西省教育厅科学技术研究项目(GJJ150551)。
关键词
数值模拟
自冲铆接
铝合金
高强钢
拉伸性能
疲劳性能
numerical simulation
self-piercing riveting
aluminum alloy
high strength steel
static tensile property
fatigue property
