Transactions of Materials and Heat Treatment

Title：Influence of prefabricated hole on forming quality and mechanical properties for steel and aluminum self-piercing riveting joint

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ClassificationCode：TG938

year,vol(issue):pagenumber：2025,50(8):201-208

Abstract：

Two kinds of self-piercing riveting joints, namely prefabricated hole joints and non-prefabricated hole joints, were fabricated by using HC420/780DP high-strength steel sheets and AlSi10MnMg-T7 die-cast aluminum alloy sheets. The influences of prefabricated hole on the forming quality, mechanical properties and failure modes of joints were investigated by drilling holes in the upper high-strength steel sheet of HC420/780DP. Then, the forming qualities of the joints were observed by the metallographic test of joint profile, and the failure mode and mechanical properties of the joints were compared by the quasi-static shear tensile test. Furthermore, the micromorphology of the joint after failure was analyzed. The results show that the undercut value of the joint without prefabricated holes is higher than that of the joint with prefabricated holes, and the nail legs of the joint without prefabricated holes have obvious upsetting deformation. Overall, the aluminum sheet of the joint without prefabricated hole is significantly compressed, and only the aluminum sheet at the rivet tip of the joint with prefabricated hole is significantly compressed. Compared with the joint without prefabricated holes, the average failure load of the joint with prefabricated hole is reduced by 28%, while the energy absorption value is nearly 400% higher.

Funds：

广西重点研发计划(桂科AB23026104)；中央引导地方科技发展资金项目(桂科ZY21195053)；2024年度广西高校中青年教师科研基础能力提升项目(2024KY1097)

作者简介：殷强（2002-），男，硕士研究生 E-mail：17384322962@163.com 通信作者：王国春（1979-），男，博士，高级工程师 E-mail：wang_guochun@126.com

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