Results of an intercomparison of creep crack growth tests made in japan

Takeo Yokobori, Chiaki Tanaka, Koich Yagi, Masaaki Tabuchi, Masaaki Kitagawa, Akio Fuji, Toshimitsu Yokobori

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)


    This paper concerns the results and analysis of Japanese round-robin tests on the VAMAS TWA 11 Creep Crack Growth Project. A high-temperature ductile material, CrMoV steel, was used. For high strain rates, creep crack growth rate is correlated by the parameter C* within less than one order of magnitude of scatter in the temperature range between 538 and 594°C and in the load range tested. However, at lower strain rates the scatter becomes larger (i.e. greater than one order of magnitude). Ir the early stages of crack growth in particular, it was found that a dual value of da/df appears with respect to the same value of C*. This peculiarity has been explained by the relation between the characteristics of creep crack length and creep strain with respect to time. By comparison, if the parameter Q* is used such a peculiar pattern does not appear at an early stage.

    Original languageEnglish
    Pages (from-to)97-107
    Number of pages11
    JournalMaterials at High Temperatures
    Issue number2
    Publication statusPublished - 1992 May


    • CrMoV steel
    • Creep crack growth
    • Early crack growth

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry


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