钛合金薄板不同连接方法的拉剪和疲劳性能
Tensile shear and fatigue properties of titanium alloy sheet joints
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摘要: 以钛合金板材为对象进行压印连接、自冲铆接和电阻点焊连接，对这三种接头进行拉-拉疲劳试验，比较其疲劳性能.结果表明，电阻点焊接头的静力学性能远高于另外两种接头.压印接头和自冲铆接头的疲劳性能较好，其中在长寿命循环时压印接头的疲劳性能更有优势.以200万次为疲劳极限时，三种接头可承受疲劳载荷顺序为压印接头最高，自冲铆接头其次，点焊接头最低.分析是由于点焊接头的热影响区性能差，残余应力叠加等原因造成.而压印和自冲铆接头内部存在板材间隙等，在疲劳加载过程中存在相对滑动和一定的形变量，起到缓解应力集中的作用，因此接头的疲劳性能较好.Abstract: In this paper, the mechanical clinching, self-piercing riveting(SPR) and resistance spot welding were applied to connect the aluminum alloy sheets. The fatigue experiments were conducted to the joints. Then the statics performance and fatigue properties were compared between the three types of joints. The results showed that the static strength of the resistance spot welding joint is the best and far higher than the others. The fatigue property of the clinched joint and the SPR joint are favorable. When the amplified applied load is high, the fatigue property of SPR joint is better. When the amplified applied load is low, the fatigue property of clinched joint is better. In the case of two million times of fatigue limit, the fatigue property of the cliched joint is the best, the fatigue property of the SPR joint is second and that of the resistance spot welding is the last. That was because the poor performance, the residual stress superposition, and the fatigue crack expansion with continuity of the thermal influence zone of the spot welding joint. However, the slight slips for mechanical joining and self-piercing riveting have effect on relaxing the concertation of stress. In this way, the fatigue property of the cliched joint and the SPR joint can be improved.
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Keywords:
- titanium alloy /
- mechanical clinching /
- self-piercing riveting /
- fatigue property
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