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管道缺陷是引起管道失效最常见的一种因素,而塑性极限压力是管道结构设计的重要参数,其与材料性能密切相关。对内外壁分别含有缺陷的管道的极限压力进行对比研究,采用有限元模拟的方法,针对管壁上的球面缺陷及沟槽型缺陷进行模拟,并对含缺陷管道的极限压力与完整管道的极限压力进行对比,指出缺陷分布在管道内壁或外壁对于管道的极限压力有着不同的影响。通过管道缺陷参数对极限压力的影响作用,进一步分析了缺陷分布位置不同引起极限压力差别的影响因素,结果表明:分布在内壁或外壁的沟槽型缺陷对管道极限压力有影响,且影响程度主要与缺陷的长度有关。
Pipeline defects are the most common cause of pipeline failure, and plastic ultimate pressure is an important parameter in pipe structure design, which is closely related to material properties. In this paper, the ultimate pressure of the pipe with inner and outer wall defects were compared. The finite element simulation method was used to simulate the spherical and groove defects on the pipe wall. The ultimate pressure of the pipe with defect and the limit of the complete pipe Pressure comparison, pointed out that the distribution of defects in the pipe wall or wall of the pipeline for the ultimate pressure has a different impact. Through the influence of the pipeline defect parameters on the ultimate pressure, the influencing factors of the difference of the ultimate pressure caused by the location of the defects are further analyzed. The results show that the groove-type defects distributed on the inner wall or the outer wall have an impact on the pipeline ultimate pressure, Dependent on the length of the defect.