Abstract
An Arrhenius-type static life equation is converted to a dynamic fatigue equation by integrating the fatigue damage fraction of the material. It is applied to high-cycle fatigue under fully reversed tension-compression loading. The final form of the life equation is not one of power law but one of exponential fitting. From the life equation, the fatigue potential energy U o and the lethargy coefficient γ are acquired. Example studies are done for fatigue S- N curves for several common structural metals: cold-rolled steels, 4340 steel in the annealed condition, 7075 T-6 aluminum and 2024 T-3 aluminum.
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