Proposal of in-situ observation method for solidified elastohydrodynamic films
| Project/Area Number |
17H03166
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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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 University |
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Principal Investigator |
Yagi Kazuyuki 九州大学, 工学研究院, 准教授 (50349841)
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| Project Period (FY) |
2017-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
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| Keywords | 弾性流体潤滑 / FT-IR / 固化 / アルコール / 吸収スペクトル / その場観察 / トライボロジー / レオロジー / 油膜厚さ / 油膜形状 |
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| Outline of Final Research Achievements |
In this study, in situ and molecular scale observation of solidification of lubricant films was conducted under elastohydrodynamic lubrication conditions in which a high pressure of the 1 GPa order is generated. The Fourier-Transform Infrared Spectroscopy was employed to analysis the solidified film. A fatty alcohol of 1-dodecanol, which is though to be solidification, and Poly-alpha-olefin (PAO) were used as lubricants for tests. For 1-doecanol, the absorption spectrum of the lubricant film indicated that a vibration of molecules seemed to be restricted and had the same shape as that of the solidified film at less than the melting temperature. On the other hand, for PAO, the absorption spectrum kept the same shape as that in the liquid state. As described above, this study could clarify the solidification phenomenon of lubricated films from the standpoint of molecular scale.
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| Academic Significance and Societal Importance of the Research Achievements |
弾性流体潤滑状態は基本的かつ基礎的な潤滑状態であり，潤滑中の摩擦損失やトラクションドライブのような動力伝達は弾性流体潤滑状態で起こる現象である．このため，弾性流体潤滑状態は，動力損失の予測や低減，そして機械の性能予測のために明らかすべき重要な研究対象である．本研究で対象とした潤滑膜の固化現象は，これまで推測の域を出ていなかったものである．しかし，本研究で行った分析により初めて固化膜の出現をその場で観察することに成功した．本研究で得られた成果は固化膜の分析方法の確立でもあり，他の潤滑油にも用いることができるため，学術的意義は大きく，今後の弾性流体潤滑状態での固化現象の理解につながるものである．
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Report
(5 results)
Research Products
(3 results)
