Transactions of Materials and Heat Treatment

Title：Influence of overlapping forms and sheet layer numbers on mechanical properties of self-piercing riveted joints

Authors： Yu Wanyuan1 Wang Chao2 Ma Shukun3 Jia Ligang4 Luo Aihui5

Unit： 1. College of Automotive Engineering Liuzhou Polytechnic University 2. State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University 3. Vehicle Performance Integration Department Aisn Auto R&D Co. Ltd. 4. Complete Vehicle Engineering SAIC-GM-Wuling Automotive Co. Ltd. 5. Automobile Steel Research Institute Baoshan Iron & Steel Co. Ltd.

KeyWords： aluminium alloy self-piercing riveting overlapping forms sheet layer numbers forming quality mechanical properties failure modes

ClassificationCode：TG938

year,vol(issue):pagenumber：2025,50(2):158-166

Abstract：

For 6063-T6 aluminum alloy sheets with a total thickness of 4.5 mm,the influences of its different overlapping forms and sheet layer numbers on the forming quality and mechanical properties of self-piercing riveted (SPR) joints were studied, and four joints, labeled as 3-A, 3-B, 2-A and 2-B, were fabricated. The results indicate that the influences of different overlapping forms and sheet layer numbers on the undercut value are relatively small, but has a greater impact on the remaining thickness. The overlapping forms and sheet layer numbers have a significant impact on the deformation mode and mechanical properties of joints, the 3-B joint always withstands shear force during the shear test and does not undergo bending deformation of sheets, and the peak force and energy absorption of 3-B joint are the highest, 76.6% and 386% higher than the minimum values of 3-A, 2-A and 2-B joints, respectively. The overlapping forms and sheet layer numbers have a significant impact on the failure mode of joints, but the failure mode of aluminum sheet is ductile fracture under shear load.

Funds：

广西高校中青年教师科研基础能力提升项目(2024KY1097)

作者简介：于万元(1987-)，女，硕士，工程师,E-mail：ywy196364@126.com;通信作者：马书坤(1985-)，男，硕士，高级工程师,E-mail：wulailianzi@163.com

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