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Proposal of in-situ observation method for solidified elastohydrodynamic films

Research Project

Project/Area Number 17H03166
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Design engineering/Machine functional elements/Tribology
Research InstitutionKyushu University

Principal Investigator

Yagi Kazuyuki  九州大学, 工学研究院, 准教授 (50349841)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
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)
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
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.

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.

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (3 results)

All 2020 2019 2017

All Presentation (3 results)

  • [Presentation] 特異形状を有する弾性流体潤滑油膜のその場FT-IR分析2020

    • Author(s)
      新谷晴明、八木和行、杉村丈一
    • Organizer
      トライボロジー会議2020 秋 別府
    • Related Report
      2020 Annual Research Report
  • [Presentation] FT-IRによる弾性流体潤滑下での固化現象の直接観察2019

    • Author(s)
      新谷晴明、八木和行、杉村丈一
    • Organizer
      日本機械学会 九州支部 沖縄講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 弾性流体潤滑膜の不安定現象2017

    • Author(s)
      八木和行
    • Organizer
      第54回 “超”を目指す軸受技術研究会
    • Related Report
      2017 Annual Research Report

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Published: 2017-04-28   Modified: 2022-01-27  

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