729 破壊モードを考慮に入れた切欠材の疲労強度に及ぼす硬さの影響に関する研究

概要

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In order to clarify the difference of fatigue strength of high strength steel between notched and un-notched specimens in terms of the maximum stress, rotating bending fatigue tests were performed of the specimens having various hardnesses and stress concentration factors with special attention to the transition of fracture mechanism mode. In terms of the nominal stress, the fatigue strength of a notched specimen was lower than that of an un-notched one, but in terms of the maximum stress the fatigue strength of the former was higher than that of the latter. The low hardness specimens showed a small difference between such fatigue strength, where fatigue crack was generated by slip bands at the surface, while the high hardness specimens presented a large difference in the fatigue strength in terms of the maximum stress with increase of stress concentration factor, where fatigue crack was generated in inclusion near the surface. Such a behavior of fatigue strength was coincident with the transition of fracture mechanism mode.
社団法人日本機械学会の論文
2003-08-05