Abstract
The estimation of fatigue crack propagation rate in structural materials and the clarification of crack propagation mechanism are extremely important. In this study, a low cycle fatigue test and a fatigue crack propagation test were carried out. Then the relation between the low cycle fatigue strength and the fatigue crack propagation rate was investigated, and the factors affecting the fatigue crack propagation rate were clarified on the basis of a damage accumulation model. Consequently it was found that Young's modulus E, the fracture ductility ef and the yield strain eN considerably affected the fatigue crack propagation rate da/dN, and the following equation involving the effective stress intensity factor range ΔKeff was proposed in order to consider the effect of material properties on the fatigue crack propagation rate. da/dN=506(ΔKeff/E)2.79/(ef√(ey))
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