On the Residual Stresses Due to Alternating Stressing of Annealed Steels

概要

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During alternating stressing of annealed steels in reversed bending, residual compressive stress is introduced near the surface of specimen, and its magnitude changes with the number of stress cycles. Residual stress appears from the very early period of stress repetitions, and the maximum value occurs at about 10^5 stress cycles, thereafter it fades gradually. Residual stress was found to vanish approximately immediately before fracture. The higher the carbon content or the yield point of the steel, the larger is the residual stress produced. The change in hardness due to alternating stressing is quite similar to that in residual stress. In the case of ascending stressing, both residual stress and hardness were found to increase more than in the case of stressing at a primary stress amplitude. By numerical calculations, the contribution of residual stresses to the fatigue strength at a fixed stress amplitude was studied. On the basis of this ideal S-N curve, the role of residual stresses in the coaxing phenomenon was also made clear.
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