Fractographic Method of Evaluation of the Cyclic Stress Amplitude in Fatigue Failure Analysis

    Published: Jan 1978

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    The first part of this paper describes laboratory work results substantiating the correlation of fatigue striation spacings with crack growth rate and with cyclic stress intensity amplitude, ΔK. The results were obtained by transmission electron microscope (TEM) replica fractography of a fracture mechanics type wedge-opening-loading (WOL) steel specimen previously tested in fatigue.

    In the second part of this paper, an illustration of a practical application of this fractographic approach is described in detail. The laboratory test results from the first part are applied successfully to the service failure analysis of a crankshaft. Cyclic stresses calculated using a combined fractographic-fracture mechanics method were in good agreement with the values obtained from a theoretical and experimental stress analysis.


    metal surface, fractures (materials), fractography, failure, transmission electron microscopes, fatigue (materials), striat ions, crack growth rate, stressintensity, stresses, stress analysis

    Author Information:

    Madeyski, A
    Senior engineers, Westinghouse Research and Development Center, Pittsburgh, Pa.

    Albertin, L
    Senior engineers, Westinghouse Research and Development Center, Pittsburgh, Pa.

    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP38086S

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