| Project/Area Number |
23560164
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Design engineering/Machine functional elements/Tribology
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
TAKASE YASUSHI 九州工業大学, 工学部, 技術専門職員 (30508445)
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| Co-Investigator(Kenkyū-buntansha) |
NODA Nao-aki 九州工業大学, 大学院工学研究院機械知能工学研究系, 教授 (40172796)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 機械要素 / 連続体力学 / 破壊 / 疲労 |
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| Research Abstract |
In this paper, to improve anti-loosing performance and fatigue strength of the bolts and nuts, the loosening and fatigue experiments are performed with varying the pitch difference. Then, the most desirable conditions for the anti-loosing performance and fatigue strength of the pitch difference are discussed. To improve anti-loosing performance, the most desirable pitch difference is alpha=alpha-middle. To improve fatigue life,the most desirable pitch difference is alpha=alpha-small. Although, the fatigue limit is not improved. In the both case, the finite element method is applied to simulate the loosening and fatigue experiment. Finally, the effect of the large notch root radius is discussed by using FEM. It is found that, the fatigue strength of large notch root radius bolts and nuts is improved.
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