中文摘要：

采用solid186单元对含缺陷腐蚀管道进行建模,基于非线性有限元隐式积分算法与塑性失效准则,分析了腐蚀形貌对高含硫输气管线强度的影响机理,并通过室内试验,验证了仿真分析的正确性。结果表明：含缺陷管道的力学行为包含弹性阶段、屈服阶段和塑性强化阶段,其中槽形缺陷和椭球形缺陷大大降低了管道的屈服点,而球形缺陷对管道的屈服点影响相对较小;缺陷对管道强度的影响主要表现为局部应力集中,其中椭球形缺陷管道在径向方向上的应力梯度最大,应力集中最为明显。

英文摘要：

A pipeline containing defects was modeled in solid 186 units. The influence mechanism of the corrosion defects on the strength of pipeline used for conveying high sour gas was analyzed based on the implicit integration algorithm of nonlinear finite element analysis and plastic failure criterion. The correctness of the simulation analyses was verified through the indoor test. The results show that the mechanical behaviors of pipeline containing defects were divided into elastic phase, elastic-plastic phase and plastic reinforcement phase. Slotted and ellipsoid defects greatly reduced the yield point while the influence of spherical defects on the yield point was relatively low. The influence of defects on strength of pipeline was mainly presented as local stress concentration and the stress gradient of ellipsoid defect pipe in the radial direction was the biggest, showing the most obvious stress concentration.