X線による切欠材の疲労破壊に関する研究 : 切欠底における残留応力変化について

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In the previous papers the authers pointed out, using annealed low carbon steel plates. that slop lines appear in a quite localized region close to the notch root at a very early stage of fatigue process. In the next stage the slop lines develop wider and longer progressively until a macroscopic crack is initiated. On the other hand, the half-value breadth of X-ray diffraction line at the notch root increases rapidly at an early stage of fatigue, then gradually in the next stage and near the crack initiation it increases rapidly again. After the crack initiation the half-value breadth increases considerably. The correlation of the changes in micro-structure and the half-value breadth for the notched specimen are similar to the case of fatigue in the unnotched specimen. Considering these experimental results, it is suggested that the fundamental difference of the mechanism of fatigue fracture is not found between the notched and unnotched specimens. However, it is reported by many investigators that the fatigue strength of the notched specimen which is characterized by the initiation of the crack is larger as compared with the predicted value of strength of the unnotched specimen divided by stress concentration factor. In order to interpret the discrepancy of fatigue strength between the notched and unnotched specimens, it is intended to take the discrepancy to be attributed to the behaviour of residual stress in fatigue process.
社団法人日本材料学会の論文
1963-12-15

X線による切欠材の疲労破壊に関する研究 : 切欠底における残留応力変化について

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