Fatigue failure under varying loading within fatigue limit diagram

Y. Kondo, H. Eda, Masanobu Kubota

    Research output: Contribution to journalConference articlepeer-review

    1 Citation (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)1-8
    Number of pages8
    JournalMaterials Science Forum
    Volume567-568
    Publication statusPublished - Feb 1 2008
    Event5th International Conference on Materials Structure and Micromechanics of Fracture, MSMF-5 - Brno, Czech Republic
    Duration: Jun 27 2007Jun 29 2007

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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