Abstract
The process of formation of fatigue macrocracks in stress concentrators is regarded as a two-parameter process described by the amplitude of local stresses at a distance d* from the tip of the concentrator and the size of the process zone d* regarded as a structural parameter of the material. It is shown that the quantity d* determines the length of an incipient macrocrack for a given material (ai=d*) and the value of the effective cyclic stress concentration factor Kf. We perform a comparative analysis of the experimental and numerical methods for the evaluation of the parameter d*. For compact notched specimens, we compare the results of determination of the factor Kf on the basis of the proposed approach and by using the well-known Neuber and Peterson relations, and we discuss the efficiency and advantages of the known and proposed approaches.
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