摘要
为了验证不同方法计算所得的螺栓预紧力能否满足密封性要求,选取2种不同尺寸和工况的管法兰-螺栓-垫片模型,进行有限元分析。运用ANSYS Workbench有限元软件建立三维模型,施加温度载荷后得到法兰系统的温度场分布。根据EN13445附录G和Waters方法确定了螺栓预紧力,分别作为初始预紧力施加在对应的管法兰系统上并进行热-结构耦合。对预紧工况和操作工况下的法兰系统进行模拟分析,并对其密封及其强度性能进行评定。结果表明:通过EN法和Waters法计算所得的螺栓预紧力,均能使法兰系统满足密封条件且符合安全评定要求;但EN13445附录G方法确定的螺栓预紧力能保证应力在法兰上更均匀地分布,且应力水平更低;EN13445附录G方法在计算时考虑了整个法兰连接接头的密封要求及其强度要求,相较于Waters法考虑情况更加全面。
In order to verify whether the pre-tightening force calculated by different methods can meet the sealing requirements,two kinds of pipe flange-bolt-gasket models at different sizes and under different working conditions were selected for finite element analysis.A three-dimensional model was built by using ANSYS Workbench finite element software,and the temperature load was applied to obtain the temperature field distribution of the flange system.The bolt pre-tightening force was determined according to EN13445 Appendix G and Waters method,and was applied as the initial pre-tightening force to the corresponding pipe flange system for thermal-structural coupling.The flange system under pre-tightening condition and operating condition was simulated and analyzed,and the sealing and strength properties were evaluated.The results show that the bolt pre-tightening force calculated by EN13445 Appendix G method and Waters method can meet the sealing requirement of flange system,and can meet the safety assessment requirements.However,the bolt pre-tightening force determined by EN13445 Appendix G method can ensure more uniform distribution of stress and lower stress level of the flange,and the EN13445 Appendix G method takes into account the sealing requirements and strength requirements of the whole flange joint,which is more comprehensive than the Waters method.
作者
梁瑞
陈斐
郭一帆
姜峰
周文海
俞瑞利
杨曦
LIANG Rui;CHEN Fei;GUO Yifan;JIANG Feng;ZHOU Wenhai;YU Ruili;YANG Xi(School of Petrochemical Engineering,Lanzhou University of Technology,Lanzhou Gansu 730050,China;Chongqing Founder High Density Electronics Co.,Ltd.,Chongqing 401147,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2021年第1期137-144,共8页
Lubrication Engineering
基金
国家自然科学基金项目(51566010)
甘肃省自然科学基金项目(B061709).
关键词
螺栓预紧力
法兰系统
密封性
热-结构耦合
bolt pre-tightening force
flange system
sealing
thermal-structural coupling
作者简介
梁瑞(1968—),男,硕士,教授,主要研究方向为安全科学与工程.E-mail:275803588@qq.com.
