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针对高钢级管线钢自止裂性能的问题,利用有限元ABAQUS软件建立裂纹扩展分析模型,对管道内壁已有初始裂纹进行分析,模拟了裂纹从内壁生长到外壁,再沿管道轴向扩展的整个过程,比较了裂纹在X80与X100管线钢中的扩展情况。研究结果表明:X100管线钢裂纹在气体压力作用下迅速扩展,泄漏导致的管道压力降低虽然降低了裂纹扩展速度,但裂纹仍然扩展较快,需施加外部作用才能彻底止裂。当管道裂纹没有扩展时,X100管线钢能较好地抵制裂纹的产生,当裂纹已经发生扩展时,X80管线钢有较好的抵制裂纹扩展的能力。可见,与X100管线钢相比,X80管线钢有较强的抗裂纹扩展能力,现有X100管线钢需要结合X80管线钢才能在工程中推广使用。
Aiming at the problem of high-grade pipeline steel’s self-rupture performance, a crack propagation analysis model was established by using finite element software ABAQUS. The initial crack on the inner wall of the pipeline was analyzed. The crack propagating from the inner wall to the outer wall was simulated, Throughout the process, the crack propagation in X80 and X100 pipeline steels was compared. The results show that the crack of X100 pipeline steel rapidly expands under gas pressure, and the decrease of pipeline pressure caused by leakage reduces the crack propagation rate, but the crack still expands rapidly and needs external action to completely crack. X100 pipeline steel can better resist the crack generation when the pipeline crack is not expanded. X80 pipeline steel has better resistance to crack propagation when the crack has been expanded. It can be seen that, compared with X100 pipeline steel, X80 pipeline steel has strong anti-crack propagation ability, and the existing X100 pipeline steel needs to be integrated with X80 pipeline steel to be used in the project.