Study on the Effect of Understress on Fatigue Life of Smooth Specimen of Carbon Steel under Rotating Bending and Reversed Torsion : On Behaviour of Crack Propagation

概要

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Two stress steps multiple tests including understress are carried out using smooth specimens of two kinds of carbon steel, S10C and S45C, under rotating bending and reversed torsion. The effects of understressing on crack initiation and fracture are examined and discussed. Cumulative cycle ratio for crack initiation and fracture calculated by Miner's rule decreases with decreasing number of cycles in one block, n_0. Understressing influences more strongly the crack propagation behaviour than the crack initiation and results in an increase in the crack propagation rate under overstress for smaller n_0. Acceleration and deceleration phenomena are recognized in crack propagation behaviour during overstressing just after the stress changes. The former occurs in the case of rotating bending, of S45C and of smaller n_0, and the latter in the case of reversed torsion, of S10C and of larger n_0.
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