Transactions of Materials and Heat Treatment

Title：Mechanical properties and failure modes on SPR specimens with multiple rivets

Authors： Zhang Ao1 2 Xiao Gang1 Zhao Lun1 Li Jiguang2 Ye Kai1 Zhang Haohan3 Zhang Lan1 Lu Jiehao1 2

Unit： 1.Institute of Ultrasonic Technology Shenzhen Polytechnic University 2.Faculty of Materials and Metallurgy University of Science and Technology Liaoning 3.Mechanical and Electrical Engineering Faculty Yunnan Open University

KeyWords： self-piercing riveting rivet quantity rivet arrangement peak load energy absorption value failure mode

ClassificationCode：TH131.1

year,vol(issue):pagenumber：2024,49(8):132-137

Abstract：

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.

Funds：

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(4103-6023271014K1)

作者简介：张奥（2000-）,男,硕士研究生 E-mail：zhangao2514@163.com 通信作者：肖钢（1973-）,男,硕士,副教授 E-mail：xiaosteel@szpu.edu.cn

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