Transactions of Materials and Heat Treatment

Title：Comparative study on self-piercing riveting and clinching for 5052H32 aluminum alloy sheet

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ClassificationCode：TG938

year,vol(issue):pagenumber：2021,46(5):101-108

Abstract：

The self-piercing riveting (SPR) and clinching of 5052H32 aluminum alloy sheet with the thickness of 1.2 mm for automobiles were comparatively studied. The result shows that when the rivet length is 4 mm, the interlock value of SPR joint is small, the joint strength and energy absorption value are low, and the rivet corners are easy to separate from the bottom plate when it is subjected to shearing and stretching. When the rivet length is 6 mm, the minimum remaining thickness of the bottom plate for SPR joint is small, and there is a risk of corrosion. When the rivet length is 5 mm, the strength, energy absorption value and metallographic parameter of SPR joint are comprehensively optimal. Furthermore, during the

clinching process,the number of riveting points has a linear relationship with the joint strength, and the relationship with the energy absorption value is fitted by a quadratic polynomial. In addition, the strength and energy absorption value of joints obtained by different riveting methods in the transverse and longitudinal force directions are basically no difference, and when the clinching joint is subjected to shearing and stretching, there are three failure modes such as tear fracture at the neck position of the upper sheet, interlocking and disengaging fracture of the upper and lower sheets and mixing fracture of the above two modes. Finally, the static strength of single-point SPR is equivalent to that of two riveting poomts for clinching, the energy absorption value of single-point SPR is equivalent to that of 3.6 riveting points for clinching.

Funds：

国家自然科学基金青年基金资助项目(51206171);江西省自然科学基金资助项目(20192BAB206033)

单丰武（1974-），男，硕士，教授级高工 E-mail：shanfw@jmev.com 通讯作者：杨海（1986-），男，硕士，工程师 E-mail：670424078@qq.com

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