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<p>The mechanisms of hydrogen-induced failure and the processes of hydrogen transport in metals are considered. A&#xa0;mathematical model of hydrogen diffusion which accounts for the interaction between local elastoplastic deformations and hydrogen diffusion is proposed. The distribution of hydrogen in the vicinity of crack-like defects on the inner surface of steel pipelines under internal pressure using the finite element method is analyzed. Analytical dependences to assess the local hydrogen concentration near defects of various geometric shapes are derived. It is established that with increasing internal pressure, the concentration of both diffusible and trapped hydrogen significantly increases, contributing to hydrogen embrittlement of the material. The obtained results can be used to predict the service life of pipelines in hydrogen power applications.</p>

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Mathematical modeling of local hydrogen concentration around defects

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • O. V. Hembara,
  • O. Ya. Chepil,
  • N. T. Hembara,
  • Ya. I. Sapuzhak

摘要

The mechanisms of hydrogen-induced failure and the processes of hydrogen transport in metals are considered. A mathematical model of hydrogen diffusion which accounts for the interaction between local elastoplastic deformations and hydrogen diffusion is proposed. The distribution of hydrogen in the vicinity of crack-like defects on the inner surface of steel pipelines under internal pressure using the finite element method is analyzed. Analytical dependences to assess the local hydrogen concentration near defects of various geometric shapes are derived. It is established that with increasing internal pressure, the concentration of both diffusible and trapped hydrogen significantly increases, contributing to hydrogen embrittlement of the material. The obtained results can be used to predict the service life of pipelines in hydrogen power applications.