STP631: Effect of Specimen Size on J-Integral and Stress-Intensity Factor at the Onset of Crack Extension

    Keller, HP
    Research engineer and division head, Deutsche Forschungs-und Versuchsanstalt für Luft-und Raumfahrt, Cologne,

    Munz, D
    Research engineer and division head, Deutsche Forschungs-und Versuchsanstalt für Luft-und Raumfahrt, Cologne,

    Pages: 15    Published: Jan 1977


    Abstract

    For a nickel-chromium-molybdenum steel and the aluminum alloy 7475, linear-elastic fracture mechanics can be applied to determine the stress-intensity factor at the onset of crack extension KIo for specimens with (Wa)c>0.4 (KIoy)2. For smaller specimens, KIo can be calculated from the J-integral JIo at the onset of crack extension, whereas linear-elastic fracture mechanics yield values which are too low. Below a minimum thickness B ≤ 50 JIoy an increase of Jo was observed.

    Keywords:

    crack propagation, fracture properties, steels, aluminum alloys


    Paper ID: STP35542S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP35542S


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