Abstract This work investigated the local buckling failure of high-strength and large-diameter pipelines containing a dent under bending moment. An improved three-dimensional numerical model was developed by considering the multiple nonlinearities of pipe geometry, material and the boundary conditions. The effect of yield strength and strain hardening parameters of pipeline steel on the critical buckling load at the dent was analyzed in detail. The results show that, the critical buckling moment of the pipeline decreases with the increase of n. However, when the internal pressure is low, the influence of internal pressure on the critical buckling moment is limited, and the hardening exponent affects the critical buckling moment only when n

中文翻译：

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弯矩作用下含平凹痕的高强度管道局部屈曲破坏分析

摘要 本文研究了弯矩作用下含凹痕的高强度大口径管道的局部屈曲破坏。通过考虑管道几何、材料和边界条件的多重非线性，开发了改进的三维数值模型。详细分析了管线钢的屈服强度和应变硬化参数对压痕处临界屈曲载荷的影响。结果表明，管道的临界屈曲力矩随着n的增加而减小。但是，当内压较低时，内压对临界屈曲力矩的影响是有限的，只有当 n 时，硬化指数才影响临界屈曲力矩