The effects of single and multiple tensile overloads on precracked center-notched sheet specimens of Ti-8 Al-1 Mo-1V titanium alloy were investigated under laboratory conditions. Single tensile overloads always delayed subsequent fatigue crack growth at lower stress levels. Multiple tensile overloads caused a delay in fatigue crack growth greater than a single overload, with the amount depending on the number of overloads. The quantitative values of fatigue crack growth delay are reported for overloads ranging from 116-233%. Single intermittent overloads applied within the delay caused by previous overloads produced the greatest delays. Conditions subsequent to overloading and encountered in realistic environment-including time at zero load, temperature, and a seawater environment-were found to reduce the delay effects greatly and should be incorporated into theoretical models. These effects are explained in terms of fatigue crack closure concepts.


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    Title :

    Fatigue Crack Growth Delays


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    1974 Automotive Engineering Congress and Exposition ; 1974



    Publication date :

    1974-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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