位移载荷作用下U形波纹管的疲劳寿命研究  

Research on fatigue life of non-reinforced U-shaped bellows under displacement load

作　　者：王伟静[1] 杨玉强 闫书丽 李张治 WANG Weijing;YANG Yuqiang;YAN Shuli;LI Zhangzhi(Luoyang Institute of Science and Technology,Luoyang 471003,China;Luoyang Sunrui Special Equipment Co.,Ltd.,Luoyang 471000,China;Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]洛阳理工学院,河南洛阳471003 [2]洛阳双瑞特种装备有限公司,河南洛阳471000 [3]南京信息工程大学,南京210044

出　　处：《压力容器》2022年第1期63-68,共6页Pressure Vessel Technology

基　　金：国家自然科学基金项目(71801085);河南省科技发展计划项目(202102310625)。

摘　　要：金属波纹管膨胀节是受热管网和设备进行热补偿的关键部件之一,具有一定的使用寿命,位移载荷会使波纹管产生超过屈服强度的应力,出现疲劳损伤,当累积损伤达到一定程度,波纹管就发生失效。对波纹管在内压及位移共同作用下进行疲劳寿命试验研究,结果表明,对称循环位移下波纹管的疲劳寿命最高,单侧压缩位移下波纹管的疲劳寿命最低,建议对膨胀节进行预变位安装,以提高膨胀节的使用寿命,该研究结果可为膨胀节的设计及应用提供参考。The metal bellows expansion joints are one of the key components of modern heating pipe network and equipment for thermal compensation.They have a certain service life.The displacement load will cause the bellows to produce stress exceeding the yield strength and fatigue damage.When the cumulative damage reaches a certain degree,the bellows will fail.The fatigue life test of the bellows under combined action of the internal pressure and displacement was carried out.The results show that the fatigue life of the bellows under symmetrical cyclic displacement is the longest,and the fatigue life of the bellows under unilateral compression displacement is the shortest.It is recommended that expansion joints should be pre-deformed before installation to improve their service life.The research results can provide some reference for the design and application of expansion joints.

关 键 词：波纹管 位移 疲劳寿命 有限元分析 

分 类 号：TH131[机械工程—机械制造及自动化] O346.2[理学—固体力学]