炭素鋼の疲労強度に及ぼす極めて浅い部分切欠きの影響

概要

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Rotating bending fatigue tests were carried out on annealed and quenched-and-tempered 0.45% carbon steel specimens with single or double extremely shallow partial notch. The fatigue strength of these specimens was discussed based on the √<area> parameter model and the concept of linear notch mechanics (LNM). The main results are summarized as follows : (1) The fatigue limits of specimens with the same √<area> are dependent on the value of notch root radius ρ when p is large. (2) When ρ is large, the estimation of LNM is reasonable. On the other hand, when ρ is small, the estimation of LNM in the original form is not reasonable. However, the error is less than about 15% and the permissible level in general use. The reason why this error occurs is that the relative elastic stress distribution is dependent on the notch depth t when ρ is small. (3) The fatigue strength of the specimens with double extremely shallow partial notches can be predicted by the concept of LNM through the results of specimen with a single notch. The reason why LNM is reasonable is that the relative elastic stress distributions of the single notch and double notch are almost the same near the notch root even in the cases of extremely shallow notch under the condition of the same ρ and the same t.
一般社団法人日本機械学会の論文
1999-05-25