TA1钛合金异种板自冲铆接头剪切-剥离性能研究

Research on Shearing and Peeling Properties of Self-pierce Riveted Joints in Dissimilar Sheets of TA1 Titanium Alloy

采用自冲铆接技术(SPR)对厚度1.5 mm的钛合金(TA1)与1420铝锂合金(1420)以及铜合金(H62)异种板材组合进行了连接试验,并对制成的单搭和T型接头进行了剪切与剥离试验,分析了各组接头的失效模式以及静力学性能。结果表明:单搭接头组的静失效载荷均值明显高于T型接头组,但前者的能量吸收均值小于后者,接头形式及失效模式对能量吸收值有很大影响;TA1钛合金异种自冲铆接头拉伸剪切的失效模式取决于塑性变形后铆钉脚的强度、铆扣强度及下板接头处的材料强度。

The connection experiments of titanium alloy （TA1） and A1-Li alloy （1420） and copper alloy （H62） dissimilar sheets with the thickness of 1.5 mm were conducted by using selfpiereing riveting （SPR） technique. The shearing tests and peeling test of the single-lap jointed joints and T-jointed joints were carried out. The failure modes and static properties of the joints were analyzed. The results show that the mean value of static failure load of the single-lap jointed group is significantly higher than that of the T-jointed group, but the energy absorption value of the former is less than the latter. The joint forms and failure modes of the joints have a great influence on the energy absorption value. The failure mode of TA1 titanium alloy dissimilar SPRjoint tensile sheafing depends on the strength of the plastic rivet feet after deformation, the rivet buckle strength and the strength of the material at the lower sheet joint.