| Project/Area Number |
22560092
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Fukuoka University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
YANASE Keiji 福岡大学, 工学部, 准教授 (20580187)
MATUNAGA Hisao 九州大学, 工学(系)研究科(研究院), 准教授 (80346816)
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| Project Period (FY) |
2010 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Keywords | 疲労 / 軸受 / 材料評価 / 強度設計法 / 転がり疲労 / はく離損傷 / せん断型疲労き裂 / 疲労強度設計法 / 進展下限界 / 軸受鋼 / 材料組織 / 真空 / せん断型き裂 |
|---|
| Research Abstract |
The failure of bearings is caused by flaking, i.e. surface delamination, due to rolling fatigue. In this study, the bahavior of the shear-mode fatigue cracks smaller than 1 mm in size was quantitatively investigated, which dominates the strength of bearings. As a result, it was confirmed that there was no significant difference of strength between the martensite structure used mainly in Japan and the bainite structure used commonly in Europe. In addition, It was revealed that the interference of crack faces acted largely as a resisting force for shear-mode crack propagation, and an equation for a new strength design was proposed.
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