X-Ray Investigation on Fatigue Damage of Metals under Mean Stress : 2nd Report, Torsional Fatigue

概要

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Following the previous studies under cyclic bending stresses, the changes in half-value breadth, residual stress, hardness and microstructure have been investigated under completely reversed torsional stress amplitude and under alternating torsional stress with mean stress. It is found that the mean stress has little effect on the aforesaid changes. So it is deduced that, in the case of torsional stresses, the fatigue mechanism is not influenced essentially with mean stress, and consequently mean stress has little effect on fatigue life. It is also found that in torsional fatigue, tensile residual stress appears on the specimen surface at the initial stage of fatigue, and then it decreases with the number of stress cycles. It seems that the tensile residual stress is due to the absorption of excess vacancies, which are produced with stress cycles, by specimen surface.
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