Fatigue crack propagation behaviour derived from S–N data in very high cycle regime

By Keisuke Tanaka, Y. Akiniwa. 2002

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The nature and the mechanism of crack initiation and early growth for very-high-cycle fatigue of metallic materials – An overview (2016, background): “Although the size of FGA is just tens of microns, as the characteristic region of crack initiation for VHCF, it consumes more than 95% of total fatigue life [43,66].”
Propensities of crack interior initiation and early growth for very-high-cycle fatigue of high strength steels (2014, background): “During this ultra-long period of cycling, the crack extension rate at its initiation and early growth is estimated as the order of magnitude between 10 11 and 10 12 m/cycle [9,12].”
The formation mechanism of characteristic region at crack initiation for very-high-cycle fatigue of high-strength steels (2016, background): “Although the size of FiE is just hundreds of microns and that of FGA is only tens of microns, the region of FGA, as crack initiation characteristic region, consumes larger than 95% of total fatigue life [17,18].”