摘要
研究螺栓法兰接头高温力学和密封性能对其可靠性研究、预防静密封系统失效有重要意义,然而目前考虑长时间服役的法兰接头密封性能的研究相对较少,特别是针对需要保温的高温法兰接头。根据螺栓法兰接头各组件的变形量建立变形协调方程,使用ANSYS软件建立法兰接头有限元模型,计算高温工况以及不同蠕变时长下法兰接头各组件的应力分布规律。理论计算与有限元仿真结果相近,验证了建立的模型可用于评估高温法兰接头的长时密封性能。研究结果表明:螺栓法兰接头大应力集中在螺母与法兰表面接触处、法兰结构拐角处以及螺栓中间部位,螺栓载荷以及结构不连续导致的应力集中是产生大应力的主要原因;高温工况下,随着服役时间延长,法兰接头各组件应力均大幅度下降;通过强度和密封性能的校核发现,垫片蠕变是法兰接头失效的主要原因。
Studying the high-temperature mechanics and sealing performance of bolted flange joints is of great significance for their reliability research and preventing the failure of static sealing systems.However,there is relatively little research on the sealing performance of flange joints that have been in service for a long time,especially for high-temperature flange joints that require insulation.A deformation coordination equation was established based on the deformation of each component of the bolted flange joint,and a finite element model of the flange joint was established by ANSYS software to calculate the stress distribution of each component of the flange joint under high temperature conditions and different creep duration.The theoretical calculation results are similar to the finite element simulation results,indicating that the established model can be used to evaluate the long-term sealing performance of high-temperature flange joints.The research results indicate that the high stress in bolted flange joints is concentrated at the contact between the nut and flange surface,the corner of the flange structure,and the middle part of the bolt.The causes of stress concentration are mainly caused by bolt load and structure discontinuity.Under high temperature conditions,with the extension of service time,the stress of each component of the flange joint decreases significantly.Through the verification of strength and sealing performance,it is found that gasket creep is the main cause of flange joint failure.
作者
吴思远
陈冉
章兰珠
WU Siyuan;CHEN Ran;ZHANG Lanzhu(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2024年第12期118-126,共9页
Lubrication Engineering
基金
国家重点研发计划项目(2020YFB2008000)。
关键词
高温蠕变
法兰接头
长时密封性能
变形协调方程
蠕变松弛
high temperature creep
flange joint
long-term sealing performance
deformation coordination equation
creep-relaxation
作者简介
吴思远(2000-),女,硕士研究生,研究方向为高温高压法兰密封性研究。E-mail:Y30220663@mail.ecust.edu.cn;通信作者:章兰珠(1971-),女,博士,教授,研究方向为机械动力学及密封技术。E-mail:lzzhang@ecust.edu.cn。
