線形切欠力学に基づく欠陥を有する切欠材の疲労強度評価

概要

論文の詳細を見る
Fatigue tests are carried out on the notched specimens of forged steels with small defects under rotating bending and it is shown that the fatigue strength of notched specimens having arbitrary sizes of notch radius and notch depth can be predicted systematically based on the concept of linear notch mechanics. The main results are summarized as follows. (1) When the notch radius is larger than a definite size, the fatigue limit is affected and decreased by the existence of defects. This is due to the statistical factor, that is, the difference in sizes of surface areas exposed to the danger of crack initiation. (2) The fatigue limits of plain specimens in the two present materials are smaller than those of some bluntly notched specimens, respectively. (3) The fatigue strength of a bluntly notched specimen having an arbitrary size can be predicted systematically by using a master-curve derived from the concept of linear notch mechanics, including the cases where crack initiations are affected by the existence of defects.
一般社団法人日本機械学会の論文
1998-12-25