Effect of creep-fatigue loading condition on crack tip fields of grade 91 steel at crack initiation and growth

Hyun Woo Jung, Yun Jae Kim, Yukio Takahashi

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    In this paper, the effect of creep-fatigue loading condition on crack tip deformation and stress fields of Grade 91 steel at 600 °C at crack initiation and growth is studied. By using finite element debond analysis method, creep-fatigue crack growth tests using C(T) specimens under various load ratios and hold times are simulated, and the effect of creep-fatigue load ratio and hold time on the crack opening profile, equivalent stress, crack-opening stress and triaxiality at crack initiation and growth is presented. It is found that the crack tip deformation and stress fields under tension–compression creep-fatigue loading are overall different from those under tension-tension creep-fatigue and pure creep loading, due to re-sharpening of the crack tip.

    Original languageEnglish
    Pages (from-to)127-135
    Number of pages9
    JournalInternational Journal of Fracture
    Volume231
    Issue number1
    DOIs
    Publication statusPublished - 2021 Sept

    Bibliographical note

    Funding Information:
    This research was supported by National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2017R1A2B2009759).

    Publisher Copyright:
    © 2021, The Author(s), under exclusive licence to Springer Nature B.V.

    Keywords

    • Crack growth
    • Crack initiation
    • Crack tip stress fields
    • Creep fatigue

    ASJC Scopus subject areas

    • Computational Mechanics
    • Modelling and Simulation
    • Mechanics of Materials

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