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Numerical Simulation of Hydrogen Embrittlement at the Example of a Cracked Pipeline

机译：管道破裂时氢脆的数值模拟

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摘要

A continuum model for numerical simulation of hydrogen induced embrittlement of pipeline material is discussed within this work. For that, a transient hydrogen model considering trapping is coupled with an elasto-plastic material model considering von Mises yielding. The hydrogen enhanced plasticity (HELP) mechanism is assumed to be active within this problem statement and is realized by a hydrogen dependent reduction of the yield strength. An iterative numerical solution scheme is applied to solve the coupled problem. At the example of a pipeline with a blunted crack, the influence of hydrogen is investigated. A localized plastic zone is observed for high hydrogen concentrations, in line with the inherent phenomena of the HELP mechanism. However, when applying hydrogen boundary conditions which are considered to be realistic for an existing natural gas pipeline, no pronounced effect of hydrogen based on reducing the yield strength could be observed. Nevertheless, this numerical results do not imply a judgment if the HELP mechanism in general could be the prevalent mechanism for failure.
机译：在这项工作中讨论了用于氢引起的管道材料脆性数值模拟的连续模型。为此，考虑捕集的瞬态氢模型与考虑冯·米塞斯屈服的弹塑性材料模型耦合。氢增强可塑性（HELP）机理在该问题陈述中被认为是有效的，并且通过屈服强度的氢依赖性降低来实现。应用迭代数值解方案来解决耦合问题。在具有钝裂纹的管道示例中，研究了氢的影响。观察到高氢浓度的局部塑料区符合HELP机制的固有现象。但是，当应用氢边界条件（对于现有的天然气管道来说是现实的）时，基于降低的屈服强度，不会观察到明显的氢效应。但是，此数值结果并不意味着可以判断HELP机制是否可能是普遍的故障机制。

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  • 会议地点 Dubrovnik(HR)
  • 作者

    Milena Moehle; Udo Nackenhorst; Olivier Allix;

  • 作者单位

    Institute of Mechanics and Computational Mechanics, Appelstr. 9A, Hannover, Germany;

    Institute of Mechanics and Computational Mechanics, Appelstr. 9A, Hannover, Germany;

    L.M.T. Cachan, 61 Avenue du Pr6sident Wilson, 94235 Cachan Cedex, France;

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