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破壊力学に基づく焼結金属の疲労強度評価 Evaluation of the Fatigue Strength of Sintered Steel Based on Fracture Mechanics 加藤, 正名 カトウ, マサナ Kato, Masana 加藤 カトウ Kato 正名 マサナ Masana 井上, 勝己 イノウエ, カツミ Inoue, Katsumi 井上 イノウエ Inoue 勝己 カツミ Katsumi 90237040 鄧, 鋼 デン, ガン Deng, Gang 鄧 デン Deng 鋼 ガン Gang 鐙, 鋼 トウ, コウ Den, Gan 宮崎大学 University of Miyazaki 佐藤, 寿樹 サトウ, トシキ Sato, Toshiki 佐藤 サトウ Sato 寿樹 トシキ Toshiki 亀子, 峰雄 カメコ, ミネオ Kameko, Mineo 亀子 カメコ Kameko 峰雄 ミネオ Mineo Sintered Steel, Fatigue Strength, Gear, Fracture Mechanics, Critical Crack Length This paper deals with an evaluation of the fatigue strength of sintered steel based on linear fracture mechanics. The fatigue crack growth is measured with bend test specimens of Fe-Cu-Cr sintered steel of various densities. From this result, the fatigue strengths of the specimens with initial length of crack a at the life N are calculated, and they are shown as N-S-A curves. A model, which has an initial crack at the surface but is homogeneous and has no internal flaws, is introduced to analyze the fatigue lives of sintered steel. The initial length of the crack basically depends on the flaw size of sintered steel, and it can be used as an index to evaluate the effect of flaws on the fatigue strength. The initial lengths of cracks are estimated from the N-S-A curves and the fatigue test results. The lengths are 165 to 251 μm for the bend test specimen of 6.6 to 7.0 g/cm3 density. 日本機械学会 The Japan Society of Mechanical Engineers 1996-07 jpn journal article VoR http://hdl.handle.net/10458/758 https://miyazaki-u.repo.nii.ac.jp/records/912 AN00187463 03875024 日本機械学會論文集. C編 Transactions of the Japan Society of Mechanical Engineers. C 62 599 2851 2856 https://miyazaki-u.repo.nii.ac.jp/record/912/files/GangDeng08.pdf application/pdf 861.6 kB 2020-06-21