Abstract
The torsional fatigue tests were performed using annealed or pre-strained 0.21%C steel specimens under constant and two-step stress amplitudes. The behavior of the fatigue cracks was observed successively on the specimen surfaces by the replication method and the characteristics of the torsinal fatigue cracks were examined. Torsional fatigue cracks tend to branch off. Under a constant stress amplitude, the rate of change in crack growth rate varies with the phenomenon of branching. Under two-step stress amplitudes, Miner's rule holds approximately on the annealed specimens but the rule does not hold on the pre-strained specimens.
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