采用分体式下模压印连接设备分别对SPCC钢和5052铝合金进行压印连接, 然后对两种材料的压印接头进行拉剪试验, 并在不同载荷水平下进行疲劳试验, 研究了它们的拉剪性能和疲劳性能。结果表明: 在拉剪载荷下, 铝合金压印接头从上、下板接触挤压的颈部发生断裂, 钢压印接头在上、下板接触挤压的颈部发生断裂的同时发生剥离失效, 压印接头的拉剪强度主要与上板的颈部强度有关; 不同材料压印接头的疲劳性能均良好, 钢压印接头的宏观裂纹出现在接头的盲孔边缘, 垂直于载荷方向延伸, 断裂发生在板材的接头处, 其在0.75倍最大破坏载荷下的疲劳寿命超过500万次; 铝合金压印接头在每种载荷水平下的疲劳寿命均可达200万次。

SPCC steels and 5052 aluminum alloy were respectively jointed by segmented die clinched joint equipment, and then the ension-shear tests for clinched joints of the two materials were conducted, and fatigue test at different load levels were performed. The results show that at the action of tension-shear load, the aluminun alloy clinched joint fractured at neck of joint, the steel clinched joint also fractured at neck of the joint and the upper sheet was separated from the lower sheet simultaneously. The tension-shear strength of joints was mainly determined by the strength of necks. The clinched joints of different materials had favorable fatigue properties. A visual fatigue crack was found at the edge of blind hole in the steel clinched joint, perpendicular to the loading direction, and the failure appearing at the region of joints. The fatigue life of steel clinched joints at 0.75Fs was over 5 million cycles and that of aluminum alloy clinched joint at ervery load levels was more than 2 million cycles.