铝、钛同质薄板冷连接工艺及接头力学性能研究

Study on Cold Joining Process of Aluminum and Titanium Homogeneous Thin Plates and Joints'Mechanical Properties

冷连接技术是一种绿色、新型和高效的机械连接技术,可实现轻型合金的有效连接,在汽车和航空领域有极大的应用前景。本文对几种典型的冷连接工艺接头的力学性能和失效机理进行了对比研究,对采用自冲铆接、拉铆连接和无铆连接三种工艺制备的各组接头进行搭接剪切试验,研究了不同搭接工艺和不同搭接材料对接头失效形式和力学性能的影响,并对这三种连接方式进行适用性分析。结果表明:自冲铆接、拉铆连接、无铆连接都可以实现5A06铝合金和TA1钛合金的有效连接,其中自冲铆接具有最强的力学性能和能量吸收,拉铆接头次之,无铆接头最差;TA1-TA1接头的力学性能均高于5A06-5A06接头;改变其连接方式和连接材料均可有效提升接头的力学性能;接头的主要失效原因均为破坏了接头的机械互锁结构。

Cold joining technology is a green,new and efficient mechanical joining technology for effective joining of light alloys,which has great application prospects in automotive and aerospace fields.A comparative study on the mechanical properties and failure mechanism of several typical cold joining joints was carried out.The lap shear test was carried out for each group of joints prepared by using three processes:self-pierce riveting,pulling riveting and clinching,and the effects of different lap joining processes and different lap materials on the failure form and mechanical properties of the joints were investigated,and applicability of the three connection methods was analyzed.The results show that self-punching riveting,pulling riveting connection and clinching connection can achieve effective connection of 5A06 aluminum alloy and TA1 titanium alloy,among which the self-pierce riveting has the strongest mechanical properties and energy absorption,the pulling riveting joint is the second and the clinching joint is worst.The mechanical properties of TA1-TA1 joints are all higher than those of 5A06-5A06 joints;changing the connection methods and connection materials can effectively improve the joint.The main reason for the failure of the joints is the destruction of the mechanical interlocking structure of the joints.