STP877

    Krak-Gages for Automated Fatigue Crack Growth Rate Testing: A Review

    Published: Jan 1985


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    Abstract

    Bondable Krak-gages were utilized to monitor fatigue crack growth rates (FCGR) of various steels in air and salt water at 24°C and in wet hydrogen at 80°C. The FCGR data generated via bondable Krak-gages were consistent with those generated via either the compliance technique or optical measurements. Moreover, Krak-gages were effective in monitoring short crack extension.

    Using atomic fusion technology, Krak-gages were sputtered on specimens so as to perform high-temperature (288 and 427°C) FCGR experiments. The FCGR results obtained with the sputtered Krak-gages were in good agreement with those obtained by the compliance method.

    The Krak-gages were found to be a valuable addition to fracture mechanics testing. They readily interface with computers for fully automated FCGR experiments.

    Keywords:

    Krak-gage, Fractomat, fatigue crack growth, propagation, automated, computer, environment, sputter, compliance, atomic fusion, bondable, corrosive, air, fracture mechanics, data acquisition and analysis, short crack


    Author Information:

    Liaw, PK
    Senior engineers and principal engineer, Westinghouse R&D Center, Pittsburgh, PA

    Logsdon, WA
    Senior engineers and principal engineer, Westinghouse R&D Center, Pittsburgh, PA

    Roth, LD
    Senior engineers and principal engineer, Westinghouse R&D Center, Pittsburgh, PA

    Hartmann, H-R
    President, Hartrun Corp., Chaska, MN


    Paper ID: STP32887S

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP32887S


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