预成角对单搭自冲铆接头强度及能量吸收的影响

Effect of Preformed Angle on Strength and Energy Absorption of Single-lap Self-piercing Riveted Joints

通过试验方法研究了预成角对5052铝合金单搭自冲铆接头强度和抗冲击性能的影响。对不同预成角自冲铆接头进行力学性能测试,并用数理统计方法检验试验数据的有效性。从自冲铆成形原理及受力方式解释了接头的失效形式。通过接头失效时能量吸收特性分析了预成角接头的抗冲击性能。试验结果表明:0°预成角自冲铆接头强度最大,但能量吸收最差。随预成角增加,接头失效时位移越大,能量吸收能力有所增强,但承载能力没有显著提高。对比0°预成角不同加载方式,0°载荷保持提高了接头承载能力和能量吸收,有利于改善单搭自冲铆接头承载能力和抗冲击性能。

The influence of preformed angle on the strength and impact resistance of self-piercing riveted （SPR） joints in aluminum alloy was investigated using experiment method. The mechanical properties of the welded joints with different preformed angle were tested and the mathematical statistical method was used to analyze the validity of the experiment data. The failure modes of the welded joints were explained by the principle of riveting process and loaded condition. The impact resistance of the joint was evaluated by the capacity of energy absorption. The results show that the strength of joint with 0°preformed angle is largest, but the energy absorption is worst. The load bearing ability of SPR joints can not improve with increase of the preformed angle, which only change the maximum displacement and improve the energy absorption. Furthermore, the joint with 0°load holding can improve the bearing capacity and energy absorption of SPR joints, which can help improve the load bearing ability and impact resistance of single-lap SPR joints.