退火处理对钛合金压印接头疲劳性能影响
Effect of annealing treatment on fatigue behavior of titanium alloy clinched joints
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摘要: 文中实现了钛合金板材的压印连接，并将得到的压印接头分成两部分，一部分不予处理，一部分进行整体退火处理. 将得到的两组试件进行静拉伸试验和拉-拉疲劳试验. 结果表明，未处理的钛合金压印接头静拉伸最大载荷均值为4 363.64 N，失效位移均值为1.48 mm. 退火处理后,钛合金压印试件的静拉伸最大载荷均值为3 879.74 N，失效位移均值为1.85 mm；未处理的钛合金压印接头疲劳性能明显优于后者，前者的疲劳极限高于后者约68%；两种接头的疲劳裂纹总是在压印点偏上的部位出现，SEM分析显示该部位应力较为集中且存在多个疲劳源，两种断口的疲劳源呈脆性疲劳断裂特征，退火处理的接头颈部断裂断口为塑性断裂.Abstract: Clinching technology was used to connect titanium alloy sheet， one group of the specimens was untreated， and the other group was annealed. Quasi static mechanics performance experiment and fatigue tests were adopted to test the property of the two kinds of joints. It can be seen from experiments that the tensile-shear strength was 4 363.64 N， the displacement was 1.48 mm. And the tensile-shear strength and displacement of the annealed joints were respectively 3 879.74 N and 1.85 mm. It can be concluded that the untreated clinched joints has a superior fatigue performance than the annealed clinched joints. The cracks of the two kinds of joints were always appear at the first force bearing point of the button， and the stress concentered in that location and there exist several fatigue sources and the fracture had feature of brittle fatigue fracture. The fracture of the annealed joints at the minimum thickness of the neck had a feature of ductile fracture.
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Keywords:
- mechanical clinching /
- titanium alloy /
- annealing treatment /
- fatigue test
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