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.
Fatigue Crack Growth Delays
Sae Technical Papers
1974 Automotive Engineering Congress and Exposition ; 1974
1974-02-01
Conference paper
English
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