摘要
输气管道因热胀冷缩产生变形,继而会产生热应力,对管道正常运作造成威胁。本文采用有限元模拟的方法建立空间模型,对管道中产生的热应力进行计算,并就影响管道中热应力的因素进行分析。结果表明:管道热应力在忽略内外压时在管道环向上呈递进式分布,且随着管道内外温度值大小分布不同,最大主应力总是出现在温度相对较小的管壁面上;管外温度低于20℃时,管道壁厚增大,管道热应力相应减小,反之管道热应力先减小后增大;有固定端约束的管道其热应力最大值往往集中出现在固定约束处;一端固定的管道产生的热应力随温度变化较为剧烈,而两端固定和不加约束情况管道热应力变化相对平缓。
As for gas pipeline,the thermal expansion and contraction deformation always lead to the thermal stress,which poses a threat to the pipeline.In the article,the finite element simulation method is used to calculate the thermal stress generated in the pipeline.Then the factors influencing the thermal stress in the pipeline are analyzed.The results show that the thermal stress of the pipeline is distributed in the direction of the pipe ring when the internal pressure and the external pressure are neglected.With the distribution of the temperature inside and outside the pipe,the maximum principal stress always appears on the wall with relatively small temperature.At 20℃,when the pipe wall thickness increases,the corresponding pipe thermal stress is reduced.On the other hand,the thermal stress decreases first and then increases.Lastly,the maximum concentration of thermal stress tends to occur at fixed constraints.The thermal stress of the pipe with fixed constraint on one end is more intense with the temperature.The thermal stress of pipe with fixed constraint on two ends and pipe with not constraints changes relatively flatly.
作者
孙颖
吕超
SUN Ying;LYU Chao(Northeast University of Petroleum School of Civil Engineering and Architecture,Daqing 163318 China)
出处
《西华大学学报（自然科学版）》
CAS
2018年第2期19-22,45,共5页
Journal of Xihua University:Natural Science Edition
基金
国家自然科学基金(51578120)
关键词
输气管道
有限元
管道壁厚
管道热应力
空间模型
数值模拟
gas pipeline
finite element
pipe wall thickness
piping thermal stress
space model
digital simulation
作者简介
孙颖（1976—），女，副教授，博士，主要研究方向为油气田防灾减灾工程及防护工程。ORCID:0000-0001-7309-9433 E-mail:2392603221@qq.com
