基于有限元计算的Ⅰ型凹痕管道峰值周期应力分析  

Peak Cycle Stress Analysis of the Ⅰ Type Dent on Pipeline Based on FE Calculation

作　　者：曹学博[1] 张鹏[1] 伍颖[1] 

机构地区：[1]西南石油大学,四川成都610500

出　　处：《压力容器》2010年第12期40-44,共5页Pressure Vessel Technology

基　　金：国家自然科学基金项目(50974105);十一五国家科技支撑计划重点项目(2006BAJ16B03)

摘　　要：凹痕缺陷是影响管道疲劳寿命的重要因素之一,它会大大降低在役管道的疲劳寿命。而凹痕管道上的峰值周期应力则是计算管道疲劳寿命的关键参数。针对管道上的Ⅰ型典型凹痕缺陷建立不同情况下的有限元模型;对大量计算结果进行整理、归纳、作图,在此基础上,对结果进行单因素和多因素分析;采用非线性回归分析方法,利用Matlab对大量计算结果进行拟合,得到一定适用范围下凹痕管道峰值周期应力与凹痕深度、管径、壁厚以及凹痕纵向长度之间的具体关系表达式。Dent is one of the important factors affecting pipeline fatigue life, and it will greatly reduce the fatigue life of the pipeline in service. And the peak cycle stress on the dented pipeline is the key parameter to calculate pipeline fatigue life. For typical I type dent in the pipeline, the finite element models are established under different circumstances. A large number of the calculation results are sorted, inducted, drawed. On this basis, the results are analysed by univariate and multivariate. Non - linear regression analysis was utilized to fit the results by Matlab, some specific expressions of the relationship between the dented pipeline peak cycle stress and the dent depth, diameter and thickness of pipeline, and the dent longitudinal length are obtained after much calculation and analog.

关 键 词：管道 凹痕 峰值周期应力 分析 

分 类 号：TQ055.8[化学工程] TB115[理学—数学]