A Review on Fatigue Life Prediction Methods for Metals

Figure 3

Probabilities that at least one fatigue crack had been nucleated in the ith group of defects (P_M is the probability for nucleation in the matrix). Fatigue failure frequencies f_i (the probability for initiation of a dominant fatigue crack in the ith group) are numerically equal to the area of the nonoverlapped regions (adapted from [78]).