低温环境下管道法兰连接的应力分析

摘要

On the premise of temperature function in the paper, FEM analysis for pipeline flange under low temperature under combination condition of“bending and stretching”with various bolt strength grade and bolt pre-tightening load was carried out.Results show that, the maximum stress appears on the bolt, both degrade of bolt pre-tightening load and degrade of bolt strength have effect on stress distribution of flange. Moreover, the paper provides changing law for lateral displacement with bolt pre-tightening load and bolt strength grade. At last, the accuracy of the numerical simulation was validated by field test. This paper provides reference for settings of pre-tightening load in the oil pipeline flanged joint.%文中在考虑温度作用的前提下,对低温管道中的法兰进行了不同螺栓强度等级和螺栓预紧力下的"拉伸+弯曲"组合工况的有限元分析.研究表明:法兰最大应力出现在螺栓上,螺栓的预紧力和强度等级的降低都将对法兰应力分布产生重要的影响.同时,文中也给出了法兰外侧的位移随螺栓预紧力和强度等级的变化规律.最后,通过现场测试验证了数值模拟的准确性.该研究结果可以为输油管线法兰连接的预紧力设定提供参考.