The effects of ferrrite grain size on fracture of low carbon steel under mixed modes I and II

T. Yokobori, A. T. Yokobori, K. Sato, M. Omotani

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    26 Citations (Scopus)


    In the previous article a new methodology is proposed for the study on fracture criterion for the notched or cracked specimens under mixed Modes I and II. In this methodology, any value of KII/KI can be applied to the thin-walled hollow cylindrical specimen with notch or crack, the length of which is perpendicular to the specimen axis. Thus the data can be obtained covering all values of KII/KI ranging from ∝ to 0, that is, from mode II to mode I. Using this method, the experimental studies were carried out on the effects of ferrite grain diameter upon the fracture of low carbon steel under mixed Modes I and II. The experimental results were compared with various fracture criteria hitherto proposed in literatures. The fracture criterion experimentally obtained is a function of ferrite grain diameter and the value of KII/KI, at fracture increases with increase of ferrite grain diameter. On the other hand, the overall direction of the crack growth obeys approximately maximum stress criterion or energy momentum tensor criterion, independent of ferrite grain diameter. Furthermore, this also shows that the fracture criterion does not reveal directly overall direction of crack growth. These characteristics are quite similar in trend to those of the unnotched specimens.

    Original languageEnglish
    Pages (from-to)75-85
    Number of pages11
    JournalEngineering Fracture Mechanics
    Issue number1
    Publication statusPublished - 1983

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering


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