Fatigue failure under varying loading within fatigue limit diagram

Y. Kondo, H. Eda, Masanobu Kubota

    研究成果: Contribution to journalConference article査読

    1 被引用数 (Scopus)

    抄録

    Although fatigue limit diagram is defined in principle for constant stress amplitude condition, it is often considered that fatigue failure would not occur even in varying loading if applied stresses were kept within the fatigue limit diagram. However, it was shown in the case of small-notched specimen and fretting fatigue that fatigue failure occurred in some special case of variable amplitude loading condition even when all stress amplitudes were kept within the fatigue limit diagram. The cause of this phenomenon was examined using two-step and repeated two-step stress patterns in which the first step stress was with zero mean stress and the second step stress had a high mean stress. A non-propagating crack was formed by the first step stress. This crack functioned as a pre-crack for the second step stress with high mean stress. Consequently, fatigue failure occurred even when all stress amplitudes were kept within the fatigue limit diagram. It was an unexpected fracture caused by the interference effect of non-propagating crack and mean stress change.

    本文言語英語
    ページ(範囲)1-8
    ページ数8
    ジャーナルMaterials Science Forum
    567-568
    出版ステータス出版済み - 2 1 2008
    イベント5th International Conference on Materials Structure and Micromechanics of Fracture, MSMF-5 - Brno, チェコ共和国
    継続期間: 6 27 20076 29 2007

    All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 凝縮系物理学
    • 材料力学
    • 機械工学

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