Fatigue Strength of Tufftrided Steel

Estimation of Fatigue Strength from Heat Generation in Specimen

Abstract

Fatigue strength of tufftrided S15CK steel (smoothed specimen) was estimated using the change of temperature at the surface of a specimen during the rotating bending fatigue test. The results obtained are summarized as follows;
(1) The relation between the mean temperature rise ΔT_eq and the number of cycles to failure N_f can be described as ΔT_eq^mN_f=C, and between ΔT_eq and the stress amplitude σ_a it is ΔT_eq=Aσ_aⁿ.
(2) The fatigue strength for each of the three specimens with different diameters, and that under varying stress in the two level single block fatigue test can be approximately estimated from the change of temperature at the surface of a specimen during the fatigue test.