Evaluation of the Methods for Estimating the Fully Reversed Unnotched Fatigue Limits of Steels

Table 4

Approximation methods for Basquin’s fatigue properties.

Approximation methods	(MPa)	b
Four-point correlation method (FPCM) [9]
Universal slopes method (USM) [9]		–0.12
Modified universal slopes method (MUSM) [10]		–0.09
Modified four-point correlation method (MFPCM) [11]
Medians method (MM) [12]		–0.09
Hardness method (HM) [4]		–0.09