Mechanical degradation and failure behavior of Al/steel electromagnetic assisted clinched joint in chloride salt environment
Mechanical degradation and failure behavior of Al/steel electromagnetic assisted clinched joint in chloride salt environment
复制标题
DOI：
10.1016/j.tws.2023.110958
复制
发表时间：
2023-09
影响因子：
6.4
通讯作者：
Yuxuan Liao;Yunbao Wang;Haozhen Qi;Guangyao Li;J. Cui;Hao Jiang
中科院分区：
文献类型：
--
作者：
Yuxuan Liao;Yunbao Wang;Haozhen Qi;Guangyao Li;J. Cui;Hao Jiang
研究了铝/钢电磁铆接接头的力学性能退化和盐雾腐蚀后的失效行为。铝/钢结构的连接首次采用EAC技术。将这些接头暴露于中性盐雾环境中，然后进行重量法、截面观察和力学性能测试。得到了材料的力学性能退化规律和失效模式演化规律。结果表明，盐雾试验后，节点的剪切峰值和拔出荷载均有所降低。老化24 d时，接头的剪切峰值和拔出峰值分别下降了22.6%和41.5%。此外，所有剪切失效模式均为股骨颈断裂。拔出失效模式从颈部断裂到混合失效，最后是分离。这表明盐雾老化对节点抗拔性能的影响大于对节点抗剪性能的影响。剪切性能的下降主要是由于盐雾环境下铝片的逐渐腐蚀和溶解，而拔出性能的下降主要是由于联锁结构的损坏。因此，有必要制定适当的铝/钢接头腐蚀防护措施。
In this paper, mechanical degradation and failure behavior after salt spray test of Al/steel electromagnetic assisted clinched (EAC) joint were investigated. The Al/steel structure was firstly joined by EAC. These joints were exposed to the neutral salt spray environment, and then gravimetric method, cross-section observation and mechanical properties tests were carried out. The mechanical degradation laws and failure mode evolution were obtained. Results showed that the peak shear and pull-out load of joints decreased after the salt spray test. At the ageing time of 24 days, the peak shear and pull-out load of joints decreased by 22.6% and 41.5%, respectively. In addition, all shear failure modes were neck fractures. Pull-out failure modes ranged from neck fracture to mixed failure, and finally separation. This indicated that the pull-out performance of joints was greatly affected by salt spray ageing, compared with the shear performance of joints. Furthermore, the degradation of shear performance was mainly due to the gradual corrosion and dissolution of Al sheets under salt spray environment, while the degradation of the pull-out performance was mainly due to the damage of the interlocking structure. Therefore, it was necessary to develop appropriate corrosion protection measures for Al/steel joints.