Abstract This work investigated buckling resistance of an X80 steel pipe containing a corrosion defect under axial compressive loading by finite element analysis. A 3-dimensional numerical model was developed to determine parametric effects on buckling behavior of the corroded pipeline. These included dimension of the corrosion defect (i.e., length, depth and width), pipeline geometry (i.e., outer diameter and wall thickness), internal pressure and mechanical properties of the steel (i.e., yielding strength, tensile strength and strain hardening exponent). The critical buckling load of the corroded pipeline is primarily affected by the depth and width of the corrosion defect, while the defect length is the least important. As the defect depth and width increase, the critical buckling load decreases, but the effect of corrosion width is not apparent when the dimensionless corrosion width w π D (w is width of corrosion defect and D is the pipe outer diameter) is greater than 0.5. The threshold defect length affecting the critical axial load of the pipeline is L D t = 4.86 (t is pipe wall thickness). When L D t > 4.86 , the influence of the defect length is ignorable. Pipeline containing a long corrosion defect feature of double buckling wave peaks, and a short corrosion defect contains a single buckling wave peak. The critical buckling load of the corroded pipeline subjected to the axial compression load increases with increased pipe outer diameter and wall thickness, but decreases with internal pressure. The increased yield and tensile strengths of the steel can improve the capacity to prevent local buckling of the corroded pipeline. The strain hardening exponent has a limited effect on the critical buckling load, which shows a significant decrease when the operating pressure is up to the critical internal pressure, resulting in yielding of the pipeline.

中文翻译：

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轴压载荷作用下腐蚀X80输气管道局部屈曲建模

摘要 本工作通过有限元分析研究了X80钢管在轴向压缩载荷作用下的抗屈曲性能。开发了一个 3 维数值模型来确定对腐蚀管道屈曲行为的参数影响。这些包括腐蚀缺陷的尺寸（即长度、深度和宽度）、管道几何形状（即外径和壁厚）、钢的内部压力和机械性能（即屈服强度、拉伸强度和应变硬化指数） . 腐蚀管道的临界屈曲载荷主要受腐蚀缺陷深度和宽度的影响，缺陷长度最不重要。随着缺陷深度和宽度的增加，临界屈曲载荷减小，但当无量纲腐蚀宽度wπD（w为腐蚀缺陷宽度，D为管道外径）大于0.5时，腐蚀宽度的影响不明显。影响管道临界轴向载荷的阈值缺陷长度为 LD t = 4.86（t 为管壁厚度）。当LD t > 4.86 时，缺陷长度的影响可以忽略。管道包含双屈曲波峰的长腐蚀缺陷特征和包含单个屈曲波峰的短腐蚀缺陷特征。受到轴向压缩载荷的腐蚀管道的临界屈曲载荷随着管道外径和壁厚的增加而增加，但随着内压的增加而减小。钢材增加的屈服强度和抗拉强度可以提高防止腐蚀管道局部屈曲的能力。