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a= crack depth A = constant da/dN=fatigue-crack-growth rate (depth/cycle) LlK=range of stress-intensity factor associated with a crack under cyclic load LlKo=threshold stress-intensity factor range, below which no crack growth occurs (derived from tests using long precracks) m=constant R = load ratio in fatigue cycle, equal to minimum load divided by maximum load Lla=range of stress in fatigue test Llao=fatigue strength derived from tests on smooth crack-free specimens, expressed as stress range
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Elsender et al. (1980) studied this question.
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