Effect of notch shape and absorbed hydrogen on the fatigue fracture below fatigue limit

Yoshiyuki Kondo, Hikaru Eda, Masanobu Kubota

    研究成果: 書籍/レポート タイプへの寄稿会議への寄与

    抄録

    It has been a common understanding that fatigue failure would not occur if all stress amplitudes are within the fatigue limit diagram. However, it was shown that fatigue failure occurred in some special cases of loading condition even when all stress amplitudes were kept within fatigue limit diagram in the case of small-notched specimen. The cause of such a phenomenon was examined using two-step loading pattern.In the case of constant stress amplitude loading, non-propagating crack was formed only at low mean stress and not formed at high mean stress. In the case of two-step loading in which the first step stress was chosen with zero mean stress and the second step stress was with high mean stress, a non-propagating crack was formed by the first step stress, which caused the fatigue fracture below fatigue limit. In this study, the effect of notch size, especially small notch, and root radius was examined. It was shown that a very small notch as small as 10μm deep notch caused the reduction of fatigue limit. The effect of absorbed hydrogen was also investigated. Absorption of 0.3ppm hydrogen caused more reduction of fatigue limit.

    本文言語英語
    ホスト出版物のタイトル17th European Conference on Fracture 2008
    ホスト出版物のサブタイトルMultilevel Approach to Fracture of Materials, Components and Structures
    ページ1281-1288
    ページ数8
    出版ステータス出版済み - 2008
    イベント17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17 - Brno, チェコ共和国
    継続期間: 9月 2 20089月 5 2008

    出版物シリーズ

    名前17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures
    2

    その他

    その他17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17
    国/地域チェコ共和国
    CityBrno
    Period9/2/089/5/08

    !!!All Science Journal Classification (ASJC) codes

    • 土木構造工学

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