STP982

    Determination of Crack Opening Load by Use of Threshold Behavior

    Published: Jan 1988


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    Abstract

    The effective stress intensity factor range ΔKeff of a Ti-6Al-4V alloy has been determined by using the threshold behavior of this material. The ΔKeff values thus determined are in complete agreement with the materials constant amplitude crack growth behavior. ΔKeff values determined from the opening load obtained by crack opening displacement (COD) and by back-face strain (BFS) are not consistent with the ΔKeff values obtained via threshold and cannot explain certain load sequence effects. This leads to the conclusion that COD and BFS measurements are unsuitable for the determination of ΔKeff, at least for this titanium alloy.

    Keywords:

    fatigue crack propagation, crack closure, crack opening load, threshold, titanium alloys


    Author Information:

    Döker, H
    Research scientist and senior research engineer, Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrtt (DFVLR), Köln,

    Bachmann, V
    Research scientist and senior research engineer, Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrtt (DFVLR), Köln,


    Paper ID: STP27213S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP27213S


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