2021 Fiscal Year Final Research Report
Constructing new friction model focusing on plastic boundary layer
Project/Area Number |
20K20964
|
Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
|
Allocation Type | Multi-year Fund |
Review Section |
Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
|
Research Institution | Osaka University |
Principal Investigator |
|
Project Period (FY) |
2020-07-30 – 2022-03-31
|
Keywords | トライボロジー / 摩擦 / 塑性変形 / 可視化 |
Outline of Final Research Achievements |
We study plastic flow in the vicinity of a severe friction interface in indentation process using high speed in-situ imaging and particle image velocimetry (PIV) analysis. Displacement and strain fields in the indentation zone are obtained at high-resolution for different indenter angles and two lubricating conditions. These fields can be used to demonstrate essential features of the material flow phenomena. The deformed layer close to the indenter wall fit a classical boundary layer profile in the framework of a Bingham-solid. Equivalent Bingham viscosities and boundary layer scaling relations are obtained. The viscosity values appear to reflect the nature of the severe friction interaction at the indenter-material interface and can potentially be used as a discriminating parameter for evaluating contributions to deformation and dissipation arising from interface friction.
|
Free Research Field |
トライボロジー
|
Academic Significance and Societal Importance of the Research Achievements |
本研究は,極めて過酷な環境下における摩擦について,摩擦摺動にともなう材料の塑性変形挙動を可視化するとともに,摩擦摺動の帰結として生じる塑性変形場から逆問題的に界面の摩擦状態のモデル化を試みるという挑戦的な課題であり,極限環境下における摩擦現象そのものの深い理解を目指すという点において,学術的意義は極めて大きい.また,本研究で得られた知見は,摩擦摺動をともなう様々な分野の発展に貢献するものであり,極めて多大な社会的波及効果を有している.
|