Transactions of Materials and Heat Treatment

Title：Influence of lower plate thickness on single lap shear strength of joint in steel and aluminum self-piercing riveting

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ClassificationCode：TG115.2

year,vol(issue):pagenumber：2022,47(7):145-153

Abstract：

For single lap shear joints of CR590 steel/AA6022-T4 aluminum alloy and CR590 steel/S-6000-IH aluminum alloy, the influence laws of the lower plate thickness on the single lap shear strength in steel and aluminum self-piercing riveting (SPR) joint was studied by finite element simulation. Then, finite element simulation models of the 2D self-piercing riveting process and the single lap shear strength of 3D self-piercing riveting joint were established respectively, and the accuracy of simulation was verified by the failure mode and the load-displacement curve through the self-priercing riveting joint experiment. The results show that when the thicknesses of lower plates with AA6022-T4 aluminum alloy and S-6000-IH aluminum alloy increase from 1.2 to 3.0 mm, the shear strengths of SPR joint increase from 3.7 and 2.8 MPa to 4.5 and 4.2 MPa, and then tend to be stable. Furthermore, the influences of the thicknesses of lower plates for different aluminum alloys on the key dimensions of SPR joint (undercut amount, residual thickness and vertical interlock value) were studied, and the influence mechanism of the lower plate thickness on the single lap shear strength of SPR joint was revealed. It is found that for the two SPR joints, the residual thickness of joint increases linearly with the increasing of the lower plate thickness, but this dimension does not affect the locking performance of the rivet. However, the undercut amount remains 0.5 mm with the increasing of the lower plate thickness, and the vertical interlock value increases linearly with the increasing of the lower plate thickness. When the thickness is larger than 2.0 mm, the vertical interlock value remains basically unchanged. For S-6000-IH and AA6022-T4 aluminum alloy lower plates, their saturation values are 1.2 and 1.0 mm respectively. Thus, the locking degree of the rivet and workpiece material increases first and then remains unchanged with the increasing of the lower plate thickness, so that the single lap shear strength of joint also exhibits this change law.

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作者简介：廖品翔（1997-），男，硕士研究生 E-mail：liaopx3008@163.com 通信作者：林建平（1958-），男，博士，教授 E-mail：jplin58@tongji.edu.cn

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