一种适用于柔性接头摆动寿命的预估方法

A prediction method for swing fatigue life of flexible joints

根据柔性接头弹性件的实际工况,采用有限元方法模拟哑铃试样和四重片试样的循环受载情况,预估不同应变条件下试样的疲劳寿命。分析仿真结果发现,四重片试样在结构及受力状态等方面更符合柔性接头摆动疲劳测试工况。选取四重片为柔性接头寿命表征件,并对其开展剪切疲劳寿命试验,发现随着应变增加橡胶的疲劳寿命减小。对比有限元预估试样件寿命与试验结果,循环次数相差13%以内,验证了该有限元寿命预估方法的正确性。文中所提出的有限元预估寿命方法可进一步应用于多种载荷情况下柔性接头的寿命预估,可节省试验成本,为柔性接头摆动寿命测试提供参考。

According to the actual working conditions of the flexible joint elastic parts,the finite element method was used to simulate the cyclic loading conditions of dumbbell specimens and four-piece specimens,and the fatigue life of the specimens under different strain conditions was estimated.The simulation results show that the four-piece specimen is more in line with the swing fatigue test conditions of the flexible joint in terms of structure and force state.The four-piece specimen was selected as life characterization part of the flexible joint life,and the shear fatigue life test of four-piece specimens was carried out.The test results show that the fatigue life of rubber decreases with the increase of strain.The fatigue life predicted by the finite element methool is compared with test results,and the difference between cycle times are within 13%,which verifies the correctness of the finite element life estimation method.The finite element life estimation method can be further applied to the life estimation of flexible joints under various load conditions,saving test costs,and providing a reference for the swing life test of flexible joints.