Numerical simulation of fatigue crack initiation in thin-walled high strength steel as modeled by voronoi-polygons

Shunsuke Toyoda*, Hideto Kimura, Yoshikazu Kawabata, Shota Hashimoto, Naotake Yoshihara, JuN'Ichi Sakai

*この研究の対応する著者

    研究成果: Article査読

    4 被引用数 (Scopus)

    抄録

    The fatigue endurance of TS 590 MPa grade low-alloy precipitation strengthened steel was numerically and experimentally examined. The microstructure was modeled using two-dimensional Voronoi polygons. Heterogeneous stress distributions were calculated using the finite element method, taking elastic anisotropy into consideration. The number of cycles before crack initiation was estimated based on the Tanaka-Mura model. By taking into account the effects of the cyclic strain of the preceding cracks, a definable macroscopic crack initiation cycle was obtained. An actual tensile and compression fatigue test was conducted on the same steel. The stress amplitude decreased as the cycle number increased. Distinct dislocation cell structure was not observed by TEM analysis. The experimental strain fatigue limit was, to some extent, lower than that of the simulation. Surface effects, specimen homogeneity, selection of slip system, and dislocation reversibility are mentioned as the probable causes for the difference.

    本文言語English
    ページ(範囲)1695-1701
    ページ数7
    ジャーナルISIJ International
    50
    11
    DOI
    出版ステータスPublished - 2010

    ASJC Scopus subject areas

    • 機械工学
    • 材料力学
    • 材料化学
    • 金属および合金

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