中・低炭素均質化組織の耐久限度における許容欠陥寸法の推定
1989 年 38 巻 426 号 p. 275-279
詳細
1989 年 38 巻 426 号 p. 275-279
A study has been made of the critical consideration on the possibility of the tolerant defect at the endurance limit of plain carbon steel specimen.
There exists the critical size of pre-crack and micropit which would not reduce the level of original endurance limit of the fine homogeneous spherodized cementite structure, and these two sizes coincide well with each other in the range less than 100μm. This suggests the existence of tolerant defect which could be estimated by fatigue experiments on pre-crack and micropit specimens. Furthermore, disagreement of the above critical sizes of the fatigue pre-crack artificial pit specimens becomes distinct with increasing degradation of homogeneity and coarsening of microstructure.
