Volume 20, Issue 5 (September 1992)

    The Use of Small Punch (Bulge) Tests to Estimate Fracture Stress in the Lower Shelf Regime

    (Received 7 October 1991; accepted 5 March 1992)

    CODEN: JTEOAD

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    Abstract

    The small punch fracture stress σf(SP) and fracture toughness KIc of embrittled turbine rotor steels have been evaluated at temperatures corresponding to the lower shelf regime. The lower bound values of σf(SP), determined by statistically analyzing the data, are found to be relatively independent of test temperature range from −196 to −170°C for rotor M steel and from −196 to −150°C for rotor T steel. The relationship of σf(SP) to fractographic features was also investigated. The lower bound values of σf(SP) were found to be comparable with values of the microscopic fracture stress σ*f. This result indicates that small punch tests might be used successfully to measure σ*f of materials at lower shelf temperatures.


    Author Information:

    Joo, Y-H
    Graduate student, associate professor, and professor, Research Institute for Fracture Technology, Tohoku University, Aza Aoba Aramaki Aobaku, Sendai,

    Hashida, T
    Graduate student, associate professor, and professor, Research Institute for Fracture Technology, Tohoku University, Aza Aoba Aramaki Aobaku, Sendai,

    Takahashi, H
    Graduate student, associate professor, and professor, Research Institute for Fracture Technology, Tohoku University, Aza Aoba Aramaki Aobaku, Sendai,

    Shimomura, K
    Research staff, Tohoku Electric Power Company, Inc., Sendai,


    Stock #: JTE11918J

    ISSN: 0090-3973

    DOI: 10.1520/JTE11918J

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    Author
    Title The Use of Small Punch (Bulge) Tests to Estimate Fracture Stress in the Lower Shelf Regime
    Symposium , 0000-00-00
    Committee E08