Steady-State Crack Growth in Rate-Sensitive Single Crystals

Kristian Jørgensen Juul, Kim Lau Nielsen, Christian Frithiof Niordson

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    Abstract

    The characteristics of the active plastic zone surrounding a crack growingin a single crystal (FCC, BCC, and HCP) at constant velocity is investigated for ModeI loading under plane strain assumptions. The framework builds upon a steady-state relation bringing the desired solution out in a frame translating with the crack tip. In the study, the shielding of the crack tip that follows from plastic slip is investigated by adopting the SSV-model. High resolution plots of the plastic zones are obtained and a detailed study confirms the existence of analytically determined velocity discontinuities from the literature. The plastic zone is found to be smallest for the FCC structure andlargest for the HCP structure, which is also reected in the shielding ratio, where FCC crystals show the smallest shielding and HCP the largest shielding.
    Original languageEnglish
    Title of host publicationProceedings of the 29th Nordic Seminar on Computational Mechanics (NSCM-29)
    EditorsR. Larsson
    Number of pages4
    Publication date2016
    Publication statusPublished - 2016
    Event29th Nordic Seminar on Computational Mechanics - Gothenburg, Sweden
    Duration: 26 Oct 201628 Oct 2016

    Conference

    Conference29th Nordic Seminar on Computational Mechanics
    Country/TerritorySweden
    CityGothenburg
    Period26/10/201628/10/2016

    Keywords

    • Quasi-static crack growth
    • Crystal plasticity
    • Plastic zones
    • Shielding ratio

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