Hydrogen diffusion analysis in the fatigue crack growth test under high pressure hydrogen

Nobuyuki Ishikawa, Toshihito Ohmi, A. Toshimitsu Yokobori

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    Prevention of hydrogen embrittlement is one of the most important issues for the materials used in hydrogen environment. Various mechanisms for hydrogen embrittlement were proposed, such as the decohesion mechanism and hydrogen enhanced localized plasticity. However, the process of hydrogen diffusion and accumulation into the fracture point is necessary for understanding of hydrogen embrittlement. In this paper, hydrogen embrittlement behavior during the fatigue crack extension test under high pressure hydrogen was first conducted. Then, hydrogen diffusion and accumulation behavior in the crack tip region was analyzed by the numerical simulation based on the Fick's diffusion theory. Alpha multiplication method which multiplies stress gradient induced terms was found to be valid to realize correct particle diffusion behaviors driven by the stress gradient term. The significance of the concept of alpha multiplication method for the numerical analysis was discussed by comparing to the experimental hydrogen embrittlement behavior.

    Original languageEnglish
    Title of host publicationMaterials and Fabrication
    PublisherAmerican Society of Mechanical Engineers (ASME)
    Volume6B-2015
    ISBN (Print)9780791857007, 9780791857007, 9780791857007, 9780791857007
    DOIs
    Publication statusPublished - 2015
    EventASME 2015 Pressure Vessels and Piping Conference, PVP 2015 - Boston, United States
    Duration: 2015 Jul 192015 Jul 23

    Other

    OtherASME 2015 Pressure Vessels and Piping Conference, PVP 2015
    CountryUnited States
    CityBoston
    Period15/7/1915/7/23

    ASJC Scopus subject areas

    • Mechanical Engineering

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