Figure 5 - Cumulative probabilities of fatigue failures from surface-initiated and interior-initiated cracks for 20 simulations with 1,000 sequential sample patterns in each simulation.
From the following article
K. S. Ravi Chandran
Nature Materials 4, 303 - 308 (2005)
doi:10.1038/nmat1351

Open symbols refer to failure by surface-crack-initiation and filled symbols to interior-crack-initiation. The probabilities converge to the range of 0.45–0.55 both for surface and interior crack initiation after a large number of simulations.
