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<p>A&#xa0;method for assessing the stress-strain state in cylindrical shells was developed, taking into account the external force loads and the influence of the absorbed hydrogen. This influence promotes an increase in internal damage to the metal and a&#xa0;significant rise in the concentration of the absorbed hydrogen, leading to the overall embrittlement of the metal. As a&#xa0;result of the specific fracture energy reduction, the material deformation resistance decreases. The finite element method and the digital image correlation method were employed to analyze the distribution of axial, tangential, and radial stresses in the walls of cylindrical shells, as well as their influence on the overall deformability of the structures. Special attention was paid to the influence of the material prestrain and hydrogen degradation on the material’s fracture resistance. The results showed that hydrogen charging can significantly reduce the critical strain, accelerating the fracture process, especially at high hydrogen concentration. Prestrain plastic deformation contributes to the increase of internal damages in the metal and the substantial growth of the absorbed hydrogen concentration, leading to the overall metal embrittlement and the specific fracture energy decrease.</p>

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A method for assessing the stress-strain state of shell structural elements under loading in the hydrogen environment

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • Ya. L. Ivanytskyi,
  • O. P. Maksymenko,
  • S. T. Shtayura,
  • M. V. Hrynenko,
  • I. V. Melnyk

摘要

A method for assessing the stress-strain state in cylindrical shells was developed, taking into account the external force loads and the influence of the absorbed hydrogen. This influence promotes an increase in internal damage to the metal and a significant rise in the concentration of the absorbed hydrogen, leading to the overall embrittlement of the metal. As a result of the specific fracture energy reduction, the material deformation resistance decreases. The finite element method and the digital image correlation method were employed to analyze the distribution of axial, tangential, and radial stresses in the walls of cylindrical shells, as well as their influence on the overall deformability of the structures. Special attention was paid to the influence of the material prestrain and hydrogen degradation on the material’s fracture resistance. The results showed that hydrogen charging can significantly reduce the critical strain, accelerating the fracture process, especially at high hydrogen concentration. Prestrain plastic deformation contributes to the increase of internal damages in the metal and the substantial growth of the absorbed hydrogen concentration, leading to the overall metal embrittlement and the specific fracture energy decrease.