引張圧縮疲労における平均応力と破断形態の関係

概要

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Fatigue tests under axial loading with tensile mean stresses were carried out on the specimens of 0.20% and 0.45% carbon annealed steels. The main results are summarized as follows : (1) The S-N curves under various mean stresses are almost the same in the range of finite lives, provided that the true stress amplitude is used by considering the constricted cross-sectional area. This is due to the fact that plastic deformation is easier to occur in the layer of specimen surface than in the inside of specimen. (2) The constriction of specimen during fatigue tests occurs when the maximum stress during stress cycling is higher than a definite value close to the yield stress. (3) The range where the small crack growth law is applicable was clarified in these materials.
社団法人日本機械学会の論文
1999-02-25