Effect of Adhesive Application on Friction Self-Piercing Riveting (F-SPR) Process of AA7075-T6 Aluminum Alloy
Effect of Adhesive Application on Friction Self-Piercing Riveting (F-SPR) Process of AA7075-T6 Aluminum Alloy
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DOI：
10.1016/j.jmatprotec.2021.117336
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发表时间：
2022
影响因子：
6.3
通讯作者：
Bingxin Yang;H. Shan;Ying Liang;Yunwu Ma;S. Niu;Xiaobo Zhu;Yongbing Li
中科院分区：
文献类型：
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作者：
Bingxin Yang;H. Shan;Ying Liang;Yunwu Ma;S. Niu;Xiaobo Zhu;Yongbing Li
运输行业对粘合剂和其他连接工艺的结合越来越感兴趣。本文开发了一种结合摩擦自冲铆接（F-SPR）和粘合剂粘合的混合连接工艺来连接 AA7075-T6 铝合金板。研究了F-SPR粘结接头的形成过程、宏观形貌、显微组织、显微硬度和力学性能，并与F-SPR接头进行了比较。结果表明，粘合剂起到了润滑作用，降低了铝板之间的接触刚度，进一步减少了咬合量，但不影响铝板之间的固态焊接。经过F-SPR粘合过程后，在约20 kN的最大铆接力下，初始0.3毫米厚的粘合层被挤压至小于0.06毫米。随后的粘合剂固化烘烤处理（30min@180℃）使铝热影响区的η强化相重新析出，进一步提高了铝的硬度以及接头的力学性能。 F-SPR 粘合接头在准静态载荷下表现出粘合失效和铆钉拔出失效的组合，其拉伸剪切强度比烘烤的 F-SPR 接头提高了 128.7%，但对交叉拉伸性能没有明显影响。 F-SPR粘合接头还叠加了F-SPR接头和粘合剂粘合接头的疲劳失效模式，在相同循环载荷幅值下表现出最长的疲劳寿命。该工艺为白车身生产中铝合金板材连接提供了一种新方法。
The combination of adhesive and other joining processes has been an increasing interest in the transportation industry. In this paper, a hybrid joining process combining friction self-piercing riveting (F-SPR) and adhesive bonding was developed to join AA7075-T6 aluminum alloy sheets. The formation process, macro morphology, microstructure, microhardness, and mechanical performance of F-SPR bonded joints were investigated comparing with the F-SPR joints. It was concluded that the adhesive played a role of lubrication for reducing the contact stiffness between the aluminum sheets, which further reduced the interlocking amount but did not affect the solid-state welding between the aluminum sheets. After the F-SPR bonding process, the initial 0.3-mm-thick adhesive layer was squeezed to less than 0.06 mm under a maximum riveting force of about 20 kN. The subsequent baking treatment for the adhesive curing (30min@180℃) re-precipitated the η strengthening phase in the aluminum heat-affected zone, which further improved the aluminum hardness as well as the mechanical performance of the joint. The F-SPR bonded joint exhibited a combination of adhesive failure and rivet pull-out failure under quasi-static loading, which improved the tensile-shear strength by 128.7 % than the baked F-SPR joint but had no apparent effect on cross-tension performance. The F-SPR bonded joint also superposed the fatigue failure modes of the F-SPR joint and adhesive bonding joint, exhibiting the longest fatigue lives under the same cyclic load amplitude. The process provides a new method for aluminum alloy sheet joining in body-in-white production.