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<p>The distribution of local hydrogen concentration near a&#xa0;semi-elliptical crack in a&#xa0;pipeline was analytically calculated and evaluated. Finite element analysis was applied to model hydrogen diffusion with consideration of the material’s stress–strain state. A&#xa0;3D model of the pipe with a&#xa0;surface crack was developed to calculate hydrostatic stresses and the hydrogen concentration distribution. The defect zone was refined and discretized using the finite element method, and simulations were carried out in the ANSYS 2024R2 software package. The results show that maximum hydrogen concentrations occur in zones of elevated hydrostatic stress and plastic deformation, particularly at the crack tip. With the increase in the crack depth, the amount of trapped hydrogen also rises, which significantly elevates the risk of hydrogen embrittlement of the material. The findings provide a&#xa0;basis for predicting pipeline durability and for developing strategies to mitigate hydrogen-induced degradation.</p>

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Evaluation of hydrogen concentration distribution near a semi-elliptical crack in a pipeline

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • O. Ya. Chepil,
  • I. M. Soviak,
  • A. M. Syrotyuk

摘要

The distribution of local hydrogen concentration near a semi-elliptical crack in a pipeline was analytically calculated and evaluated. Finite element analysis was applied to model hydrogen diffusion with consideration of the material’s stress–strain state. A 3D model of the pipe with a surface crack was developed to calculate hydrostatic stresses and the hydrogen concentration distribution. The defect zone was refined and discretized using the finite element method, and simulations were carried out in the ANSYS 2024R2 software package. The results show that maximum hydrogen concentrations occur in zones of elevated hydrostatic stress and plastic deformation, particularly at the crack tip. With the increase in the crack depth, the amount of trapped hydrogen also rises, which significantly elevates the risk of hydrogen embrittlement of the material. The findings provide a basis for predicting pipeline durability and for developing strategies to mitigate hydrogen-induced degradation.