流固耦合作用下高压输气管道疲劳寿命分析  

Fatigue Life Analysis of High Pressure Gas Pipeline under Effect of Fluid Structure Interaction

作　　者：李星[1] 曾祥国[1] 张雯[2] 张毅 陈华燕[1] 

机构地区：[1]四川大学建筑与环境学院 [2]中国石油西南油气田分公司输气管理处 [3]宝鸡钢管资阳钢管厂技术科

出　　处：《石油机械》2014年第5期116-120,共5页China Petroleum Machinery

基　　金：四川省应用基础研究计划项目"高压输气管线钢变形与失效的多尺度行为研究"(13JC0277);西气东输管道工程项目"挖掘载荷作用下埋地输气管道动力学响应的研究"(07H461)

摘　　要：为了发展在输气压力波动下高压输气管道疲劳寿命计算方法和探究影响疲劳寿命的动态载荷条件,利用ADINA有限元软件建立了高压输气管道与天然气相互作用的流固耦合模型,得到高压输气管道在输气压力波动下的动态响应,弯管在曲率最大处出现应力集中现象。流固耦合计算结果表明,管道应力主要取决于输气压力波动,气体流速对管道应力的影响可以忽略。利用MSC.Fatigue软件,将ADINA软件计算获得的疲劳载荷时间历程关系进行雨流计数处理,获得了载荷幅值和均值的频次直方图,采用全寿命法计算获得了对应载荷幅值和均值的线性累计损伤直方图,得到弯管疲劳寿命为1 240次,且疲劳破坏发生在弯管曲率最大处。提供的计算方法和结果可为高压输气管道的安全控制和设计提供参考。To develop the calculation method for the fatigue lite of high pressure gas pipeline and explore the dynamic load condition influencing the fatigue life under gas pressure fluctuation, the ADINA finite element soft- ware was used to establish the model of the fluid structure interaction between high pressure gas pipeline and natural gas. It was tound thai the stress concentration of high pressure gas pipeline occurs at the maximum curvature place of dynamic response bent tube under gas pressure fluctuation. The fluid structure interaction calculation shows that the pipeline stress is mainly determined by gas pressure fluctuation and the effect of gas velocity on pipeline stress is negligible. The MSC Fatigue software was used to conduct a rain-flow counting treatment of the fatigue load-time his- tory relation obtained by the ADINA software calculation. The frequency histogram of load amplitude and mean was derived. Adopting the life-cycle method to conduct a calculation, it was found that the linear cumulative damage histogram of the con＇esponding load amplitude and mean to the bent tube fatigue life is 1240 times. Moreover, the fatigue damage happens at the place of bent tube with the maximnm curvature.

关 键 词：高压输气管道 X70管线钢 ADINA 流固耦合 疲劳寿命 

分 类 号：TE832[石油与天然气工程—油气储运工程]