Transactions of Materials and Heat Treatment

Title：Microscopic failure study on self-piercing riveting joints for aviation aluminum alloys

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ClassificationCode：TH131. 1

year,vol(issue):pagenumber：2023,48(1):121-127

Abstract：

The effective connection of 2A12 and 6061 aviation aluminum alloy sheet materials was realized by self-piercing riveting (SPR) technology, and a tensile-shear test was conducted. Then, the static failure form of joint was analyzed from the macroscopic level, and the failure mechanisms of joint pull-out and substrate fracture were studied from the microscopic level. The results show that the main form of static failure for aviation aluminum alloy SPR joint is a pull-out failure, and there is a phenomenon of joint pull-out with button-off. At the same time, there are failure modes of upper sheet fracture and lower sheet fracture. The pull-off failure mechanism was analyzed. From the macroscopic point of view, it is found that the joint has obvious scratches and large plastic deformation. From the microscopic point of view, it is found that the fracture failure mechanism of the upper sheet is intergranular fracture and local microscopic hole aggregation, the fracture failure mechanism of the lower sheet is dominated by shear fracture in the upper and lower edge areas of sheet, and the normal fracture of the microscopic hole aggregation type is mainly in the area near the thickness center of specimen.

Funds：

国家自然科学基金青年基金和面上项目(12104324,12074354); 中国博士后科学基金面上项目(2021M703392);深圳职业技术学院深圳市高端人才科研启动项目(6022310046k)

作者简介: 林　森(1995-), 男, 硕士研究生 E-mail: linsen233keep@ 163. com 通信作者: 赵　伦(1988-), 男, 博士, 特聘副研究员 E-mail: zhaolun@ szpt. edu. cn

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