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为了预测承受交变载荷铜伸缩节的疲劳寿命并进行可靠性设计,采用结构力学、有限元法和实验应力测试技术对某型号铜伸缩节进行了应力分析,获得了工作载荷下伸缩节的应力分布和最大应力值;利用自行设计的高精度变形控制辅助装置在MTS电液伺服疲劳试验机上完成了实物件常温低周疲劳性能试验研究,监测了关键部位的局部应变,基于不同载荷水平下的疲劳试验结果得到了伸缩节疲劳设计曲线,试验发现伸缩节疲劳寿命对外载荷变形量特别敏感;疲劳试验结果表明许可设计变形下的伸缩节疲劳寿命能够满足工程设计要求。
In order to predict the fatigue life of copper expansion joints under alternating load and to design the reliability, the stress of a certain type of copper expansion joint was analyzed by using the methods of structural mechanics, finite element method and experimental stress testing. The stress of expansion joint under working load Distribution and the maximum stress value. At the MTS electro-hydraulic servo fatigue testing machine, the real-time low-cycle fatigue performance test of real object was completed by using the high-precision deformation control aid designed by ourselves. The local strain at the key part was monitored. Based on the different load levels The result of fatigue test shows that the fatigue life of telescopic joint is very sensitive to the deformation of telescopic joint. The fatigue test results show that the fatigue life of telescopic joint under design permitting can meet the engineering design requirements.