Applicability of applied stress estimation method based on the micro hardness of fatigue fracture surface of stainless steel without striations

Yoshiyuki Kondo, Takuya Ogawa, Masanobu Kubota

    研究成果: Contribution to journalArticle査読

    抄録

    In the failure analysis of fatigue fracture, the estimation of applied stress by examining the fatigue fracture surface is important in order to investigate the cause of failure. A fractographic method using striations has been established. Striations, however, can be observed only when a crack propagated at relatively high rate. In the case of failure after a long period of operation under low stress condition, striations are rarely observed. The estimation of applied stress is almost impossible in such a case. Therefore, an estimation method which can be applied in the low stress intensity region where striations are not observed is desirable. In this study, the applicability of micro hardness measured directly on the fatigue fracture surface as a parameter for the stress estimation was examined, The hardness of fatigue fracture surface was correlated with the stress intensity factor range. In addition, as an approach to service load, the relationship between the hardness of fatigue fracture surface and K value was investigated using repeated two-step stress.

    本文言語英語
    ページ(範囲)1256-1262
    ページ数7
    ジャーナルNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
    74
    9
    DOI
    出版ステータス出版済み - 9 2008

    All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 材料力学
    • 機械工学

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