切欠材の疲労強度に及ぼす予加工の影響
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概要
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Many researches are reported on the fatigue strength of unnotched specimens pre-strained. By their results， the fatigue limit of the pre-strained materials generally increase with increasing of the amount of pre-strain， but it is lower than that of the original when the pre-strain is small. While there are few investigations on the fatigue of notched specimens pre-strained. This paper is the results of experiment on the fatigue strength of the notched steel specimens having semi-circular groove of O.54 mm radius，for which the tensile pre-strain and then the fatigue test by direct stress are conducted. And they are different from those of the previous investigations on the fatigue strength of the pre-strained unnotched materials. That is，the fatigue limit rises with the increasing of the amount of pre-stratin，even when the pre-strain is small. This pheomenon is made clear from the results of the measurement of micro-hardness on the cross section and the observation on the surface of the notch root，as following：the state of the notch root under small pre-strain corresponds to the large pre-strain of the unnotched specimen.
- 長崎大学工学部の論文
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