锻压技术

下板厚度对钢/铝自冲铆接接头单搭剪切强度的影响

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

作者：廖品翔林建平闵峻英戚成威

单位：同济大学

关键词：自冲铆接异种材料单搭剪切强度厚度接头

分类号：TG115.2

出版年,卷(期):页码：2022,47(7):145-153

摘要：

以CR590钢/AA6022-T4铝合金以及CR590钢/S-6000-IH铝合金单搭剪切接头作为实验对象，借助有限元仿真研究了下板厚度对钢/铝自冲铆接接头单搭剪切强度的影响规律。分别建立了2D自冲铆接过程以及3D自冲铆接接头单搭剪切的有限元仿真模型，并通过自冲铆接接头实验的失效模式与载荷-位移曲线验证了仿真的准确性。分析结果表明：当AA6022-T4铝合金下板与S-6000-IH铝合金下板的厚度由1.2 mm增加至3.0 mm时，SPR接头的单搭剪切强度开始由3.7与2.8 MPa增加至4.5与4.2 MPa，而后趋于稳定。并研究了不同铝合金下板厚度对SPR接头关键尺寸（底切量、剩余厚度和垂直互锁值）的影响，进而揭示了下板厚度对SPR接头单搭剪切强度的影响机理，发现：对于两种SPR接头，接头剩余厚度均随着下板厚度的增加而线性增大，但该尺寸不影响铆钉的锁合性能；而底切量随下板厚度的增大保持在0.5 mm不变；垂直互锁值则随着下板厚度的增加先线性增加，当下板厚度大于2.0 mm时则基本保持不变，对于S-6000-IH铝合金下板以及AA6022-T4铝合金下板，其饱和值分别为1.2以及1.0 mm，因此导致铆钉与工件材料的锁合程度随下板厚度的增大先增大后保持不变，使接头单搭剪切强度也同样呈这一变化规律。

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.

基金项目：

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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