STP803V2

    Computer-Controlled Single-Specimen J-Test

    Published: Jan 1983


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    Abstract

    The development of a computer-controlled single-specimen J-test procedure is described. The results of a sensitivity study to determine the effect of analog-to-digital converter resolution and transducer signal noise on elastic unloading compliance crack length measurements are presented. The results are used to estimate the minimum equipment performance specifications needed for successful J-test automation. The actual test system is described along with the details of the automated procedure.

    A comparison is made between results obtained using the automated procedure and the more conventional heat-tinting technique for HY-130 at room temperature (tested as part of the American Society for Testing and Materials J-Integral R-Curve Round Robin Program) and nuclear pressure vessel grade steels at 200 to 290°C. Good agreement in the generation of Ja data was found in all cases. However, some difficulty was encountered in predicting absolute crack lengths by compliance in the round-robin tests, apparently due to specimen design.

    Keywords:

    data acquisition, unloading compliance, elastic-plastic fracture, J-integral test, crack propagation


    Author Information:

    Van Der Sluys, WA
    Section manager, metallurgy, and research engineer, Babcock & Wilcox, a McDermott company, Alliance Research Center, Alliance, Ohio

    Futato, RJ
    Section manager, metallurgy, and research engineer, Babcock & Wilcox, a McDermott company, Alliance Research Center, Alliance, Ohio


    Paper ID: STP36782S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP36782S


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