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Fatigue Crack Deflection-Induced Retardation Based on the Principle of the Minimum Potential Energy


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DOI: https://doi.org/10.15866/ireme.v9i3.6153

Abstract


Fatigue crack growth retardation due to tensile overload-induced crack deflection is analyzed. The minimum potential energy principle is implemented to estimate the crack geometry change during the transition from the mode I to mode I+II. An effective stress intensity factor amplitude is derived to approximate the subsequent reduction of the fatigue crack growth rate due to an overload. The proposed model is applied to certain loading cases of CrNi steel, yielding encouraging results.
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Keywords


Crack Deflection; Retardation Factor; Minimum Potential Energy; Mixed Mode; Fatigue

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References


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