高强钢-铝合金异质薄板无铆成形连接试验

针对性能差异较大的异质材料6061-T6铝合金和HC340/590DP双相钢的无损伤连接问题，对基于无铆成形连接的钢铝混合车身连接技术进行研究，通过试验研究了钢-铝无铆连接的成形规律以及不同搭接形式下的连接质量。分别对上钢下铝和上铝下钢两种无铆连接接头形式的连接质量进行研究，利用成形截面颈部厚度、自锁值、底部厚度等重要工艺参数，分析了成形力对接头质量的影响规律。通过拉剪试验研究了无铆接头的强度和能量吸收值。分析和试验结果表明，采用上钢下铝的连接方式，成形力为40 kN时无铆接头质量较好，其强度与安全性均符合设计指标的要求。

Clinching Test for High Strength Steel-Aluminum AlloyDissimilar Material Sheets#br#

The non-destructive connection between 6061-T6 aluminum alloy and HC340/590DP duplex steel with large performance differences was studied. The forming law of the steel-aluminum clinching processes and the connection quality under different joints were studied through tests. The qualities of the joints between the upper steel-lower aluminum and the upper aluminum-lower steel were studied respectively. The influences of forming forces on the joints quality were quantified by using the important processing parameters such as neck thickness， undercut and bottom thickness of the forming sections. The strength and energy absorption of clinched joints were studied by tensile shear tests. The results show the quality of clinched joints is good when the forming force is as 40 kN， and the strength and safety of the joints meet the requirements of design index.