温度荷载作用下受约束凹陷管道受力研究

RESEARCH ON THE MECHANICAL PERFORMANCE OF CONSTRAINED DENTED PIPELINE UNDER TEMPERATURE LOAD

为研究凹陷缺陷对油气管道可能造成的本体损伤和安全隐患,采用ABAQUS软件建立温度荷载作用下受约束凹陷管道有限元模型,结合Ramberg-Osgood模型以及更符合实际的二段式应力-应变本构方程准确地模拟钢材非线性本构模型。文中探究了凹陷深度、管道内压以及温度荷载对管道运行内压作用下受约束凹陷管道的应力应变的影响规律。研究发现对受约束凹陷管道应力应变影响最显著的是凹陷深度,其次是管道内压,最后是温度荷载,为这类钢制管道设计提供参考。

In order to investigate the body damage and potential safety hazards caused by dent defects on oil and gas pipelines,ABAQUS software is adopted to establish the finite element model for constrained dented pipeline under temperature load.The nonlinear constitutive model of steel material is accurately simulated by the combination of Ramberg-Osgood model and the two-stage stress-strain constitutive equation that is more suitable for practice.The influences of the dent depth,the pipeline internal pressure,and the temperature on the stress and strain of constrained dented pipeline under operating internal pressure are investigated.It is found that the most significant influence on the stress and strain of constrained dented pipeline is the dent depth,followed by the pipeline internal pressure,and finally the temperature load,providing the reference for the design of this kind of steel pipeline.