In this work the high cycle fatigue resistance is estimated by assuming that the total fatigue life is given by the fatigue crack propagation life (from a crack length equal to the predominant microstructural dimension), neglecting the number of cycles that it is necessary to nucleate the cracks. An expression for the material resistance to crack propagation as a function of the crack length is obtained from a depth given by the position d of the strongest microstructural barrier to crack propagation, which defines the plain fatigue limit. The difference between the total driving force and the material resistance to crack propagation defines the effective driving force applied to the crack. The presented method was applied to estimate the high cycle fatigue life for a low carbon steel of the type JIS 10C.
展开▼
