Evaluation of creep crack growth properties using circular notched specimens

Masaaki Tabuchi, Takeshi Adachi, Toshimitsu Yokobori, Akio Fuji, Jechang Ha, Takeo Yokobori

    Research output: Contribution to journalArticlepeer-review

    27 Citations (Scopus)

    Abstract

    It is important to evaluate the effect of multiaxial stress conditions on initiation and growth of creep cracks, when the laboratory data are subsequently applied to structural components under the same or similar stress state. The round robin tests of creep crack growth using circular notched specimens of 1CrMoV steel at 538 and 594 °C and l2CrWCoB steel at 650 °C were conducted by the Japanese VAMAS TWA25 group. The effect of notch depth and specimen size, i.e. stress multiaxiality on crack growth properties was investigated. The test procedure including criteria for crack length measurement by electric potential drop was established. The circular notched specimens fractured intergranularly and showed different crack growth behaviour from that of a CT specimen due to the multiaxial stress field. The creep crack growth rate for the same C* value increased as the ratio of the notch depth to specimen diameter, i.e. stress multiaxiality increased. The Q* evaluation method based on the thermally activated process can also be applied to the circular notched specimen.

    Original languageEnglish
    Pages (from-to)417-425
    Number of pages9
    JournalInternational Journal of Pressure Vessels and Piping
    Volume80
    Issue number7-8
    DOIs
    Publication statusPublished - 2003 Sep 1

    Keywords

    • C parameter
    • Circular notched specimen
    • Creep crack growth
    • Multiaxial stress condition
    • Round robin test
    • Thermal activated process

    ASJC Scopus subject areas

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

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