基板宽度与铆钉高度对单搭自冲铆接头准静态力学性能的影响

Influence of Plate Width and Rivet Height on the Static Mechanic Properties of Self-piercing Riveted Joints

自冲铆(SPR)是一种可以实现汽车车身结构轻量化重要薄板材料连接技术。为研究基板宽度与铆钉高度对自冲铆接头准静态力学性能的影响,测试获得最优铆接参数,制备两组均为单搭搭接长度20 mm基板宽度为20 mm的S(铆钉高度为5 mm)和SFX(铆钉高度为6 mm),一组搭接长度为40 mm基板宽度为40 mm的S-的5052铝合金自冲铆接头。基于准静态力学实验,分析各组接头的强度、刚度、失效形式以及能量吸收水平。结果表明:S-组失效载荷约为SFX组1.10倍,SFX组失效载荷约为S组1.24倍;S-组刚度大于SFX组,SFX组大于S组。三组自冲铆接头失效模式均为铆钉与上板从下板拉脱,铆钉头出现不同程度下陷;S-组能量吸收值约为SFX组的1.08倍,SFX组约为S组的1.76倍。

Self-riveting （SPR） is a connection technique of important realize the weight of the car body structure. In order to study the influence of plate width and rivet height on self-piercing riveted statics performance, the optimal riveting parameters are obtained. The preparation of tensile-shear single rivet lap length 20 mm width were 20ram S whose rivet height were 5mm and SFX whose rivet height were 6ram, lap length of 30 mm widths of 40 mm（ S -） three sets of self-piercing riveting in 5052 aluminum alloys. Based on the experiment of quasi- static loading conditions, this paper analyzes the strength, stiffness of each joints＇ failure modes and the energy absorption level. Results show that S-group failure load was about 1.1 times of the SFX group, the SFX failure load is about 1.2 times of the S group ; the S- group stiffness is greater than the SFX group, which is greater than the S group. Three groups from riveting alloys failure modes are ： S-, S and SFX group are rivets from the lower pulled off, at the bottom of the upper two rivet heads are sinking ; S- group energy absorption value is about 1.08 times that of DR group, SFX grope is about 1.76 times of S group.