Transactions of Materials and Heat Treatment

Title：Influence of natural aging on properties of self-piercing riveting joint for 5A06 aluminum alloy

Authors： Lei Junle1 Liu Gaoyu1 2 Zhao Lun2 Lei Le2 Ye Kai2 Lu Jiehao2 Li Chengwang2 Zhang Yaping2 Song Zhendong2 Bao Danyang2

Unit： 1. College of Mechanical and Control Engineering Guilin University of Technology 2. Institute of Ultrasonic Technology Shenzhen Polytechnic University

KeyWords： self-piercing riveting 5A06 aluminum alloy sheet natural aging static mechanical property microscopic analysis

ClassificationCode：TH131.1

year,vol(issue):pagenumber：2024,49(4):125-130

Abstract：

In order to study the influence of natural aging on self-plercing rievting joint, the self-piercing rievting was conducted with 5A06 aluminum alloy. From the macroscopic level, the influences of natural aging on the properties of 5A06 aluminum alloy self-piercing riveting joint were studied by tensile experiment, and from the microscopic level, the mode and mechanism of pull-out failure for joint were analyzed. The results show that after one year of natural aging, the distortion degree of joint with the special mechanical interlock structure reduces due to the release of its stress. The average peak load of joint decreases by 15.28%, the average failure displacement increases by 58.37%, and the average energy absorption increases by 55.92%. The stress release at different stress concentration positions of joint are not uniform, the stress concentration release rates of the upper and lower sheets are different, which leads to different failure locations in the two groups of experiments. After one year of natural aging treatment, the distribution of dimples at the failure point of joint is denser, the shape is larger and deeper, the brittleness of joint decreases, and the plasticity increases.

Funds：

国家自然科学基金资助项目（12104324）；高层次人才科研启动项目（6022310046K，6024330003K）；深职大-新栋力超声波焊接技术研发中心项目（602331009PQ）；深圳职业技术大学博士后出站后期资助项目(6023271014K1);广东省普通高校特色创新项目(504-6020210006T);深圳市优秀科技创新人才培养项目(RCBS20210706092213010)；广西自然科学基金资助项目（2022GXNSFAA035528）

作者简介：雷军乐(1982-)，女，博士，教授 E-mail：40911409@qq.com 通信作者：赵伦(1988-)，男，博士，特聘副研究员 E-mail：zhaolun@szpu.edu.cn

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