Volume 14, Issue 6 (November 1986)

    A Method for Determining Conservative Fatigue Threshold While Avoiding Crack Closure

    (Received 1 November 1985; accepted 12 April 1986)

    CODEN: JTEOAD

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    Abstract

    The low-rate fatigue properties of a mild steel are obtained on small compact-type (CT) specimens while avoiding crack closure. These properties are similar to those of butt-welded joints obtained at a much lower stress ratio in the range −1 to 0.5. This is a result of the existence of tensile residual stress at the crack tip of the welded joint which prevents crack closure even at low stress ratios. It is concluded that the most conservative fatigue crack propagation properties, including fatigue threshold values, can be easily obtained by confirming that the results are the same for CT specimens tested at different terminal stress ratios using a ΔK decreasing method which avoids crack closure.


    Author Information:

    Matsuoka, S
    Senior Researcher, Researcher, Researcher, Researcher, Head, and Director, Fatigue Testing Division, National Research Institute for Metals, Tokyo,

    Takeuchi, E
    Senior Researcher, Researcher, Researcher, Researcher, Head, and Director, Fatigue Testing Division, National Research Institute for Metals, Tokyo,

    Kosuge, M
    Senior Researcher, Researcher, Researcher, Researcher, Head, and Director, Fatigue Testing Division, National Research Institute for Metals, Tokyo,

    Shimodaira, M
    Senior Researcher, Researcher, Researcher, Researcher, Head, and Director, Fatigue Testing Division, National Research Institute for Metals, Tokyo,

    Ohta, A
    Senior Researcher, Researcher, Researcher, Researcher, Head, and Director, Fatigue Testing Division, National Research Institute for Metals, Tokyo,

    Nishijima, S
    Senior Researcher, Researcher, Researcher, Researcher, Head, and Director, Fatigue Testing Division, National Research Institute for Metals, Tokyo,


    Stock #: JTE10348J

    ISSN: 0090-3973

    DOI: 10.1520/JTE10348J

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    Author
    Title A Method for Determining Conservative Fatigue Threshold While Avoiding Crack Closure
    Symposium , 0000-00-00
    Committee E08