Transactions of Materials and Heat Treatment

Title：Experimental study on equal channel angular pressing and cold upsetting composite forming for 6063 aluminum alloy aviation rivets

Authors： Li Shiqian He Tao Huo Yuanming Yao Tingting Jia Dongsheng Li Hanlin

Unit： Shanghai University of Engineering Science

KeyWords： 6063 aluminum alloy equal channel angular pressing(ECAP) cold upsetting mechanical property rivet failure

ClassificationCode：TG146.21

year,vol(issue):pagenumber：2022,47(8):138-145

Abstract：

In order to explore the mechanical properties and failure forms of aluminum alloy aviation rivets formed by equal channel angular pressing（ECAP）and cold upsetting(CU) composite forming, for 6063 aluminum alloy aviation rivets, the ECAP-CU composite forming experiments and different types of failure experiments were carried out, and the fracture morphology of formed rivets was observed by SEM. The results show that compared with the rivet formed by single cold upsetting, the maximum tensile load of the rivet by the composite forming is increased by about 14.2% in pure tension, the failure form is pull-off failure of head, the number of holes in the micro-fracture is significantly reduced, and the dimples become shallow. However, in pure shear, the maximum shear load of the rivet by the composite forming is increased by about 15.2%, the failure form is the shear failure of rod along the shearing direction, and the shear dimples on the fracture surface become larger and shallower. When composite loading, the maximum load of the rivet by the composite forming is increased by about 45.6%, the failure form is shear fracture in which the rod is bent with a certain angle, and more shear dimples appear on the fracture surface.

Funds：

上海市自然科学基金资助项目（20ZR1422100）；国家重点研发项目（2018YFB1307900）；上海市人才发展资金资助项目（2019022）

作者简介：李诗谦（1996-），男，硕士研究生，E-mail：worklishiqian@163.com；通信作者：何涛（1979-），男，博士，教授，E-mail：hetao@sues.edu.cn

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