Visualization of adhesion phenomenon connecting nano and macro of rubber friction
| Project/Area Number |
21K18670
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
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| Research Institution | Niigata University |
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Principal Investigator |
Nitta Isami 新潟大学, 自然科学系, 教授 (30159082)
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| Co-Investigator(Kenkyū-buntansha) |
月山 陽介 新潟大学, 自然科学系, 准教授 (00533639)
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| Project Period (FY) |
2021-07-09 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
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| Keywords | ゴム摩擦 / 真実接触面積 / メニスカス / 凝着 / 広視野レーザ顕微鏡 / 水 / 非架橋部 |
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| Outline of Research at the Start |
ゴム表面の接触については，表面微小突起などのミクロサイズで研究が行われ，垂直力，分子間力（JKR理論），メニスカス力が与える真実接触面積Arへの影響が判明している．しかしこの考えを，靴底全体のマクロ領域に単純に拡張適用できるかの妥当性は明らかではない．そこで，本研究では広視野レーザ顕微鏡を使って真実接触面積の分布を明らかにし，これまでは不明であったメニスカス力などの分布を可視化することに挑戦する．
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| Outline of Final Research Achievements |
The influence of meniscus forces acting on rubber and glass was investigated from a macroscopic point of view. In smooth rubber specimens, the real contact area, Ar, greatly increased slightly with contact time in dry condition. Due to the intervention of water, Ar increased significantly with contact time. This is due to the meniscus force attracting the rubber to the glass and expelling the water. In the case of ethanol, which evaporates quickly, Ar increased in a short time. The rate of increase of the friction coefficient did not correspond to that of Ar. The reason for this is that the Ar increased by meniscus force is subject to compressive stress, but when the water evaporates, the meniscus force disappears and the compressive stress changes to tensile stress. Therefore, when frictional force is applied, the Ar that was under compressive stress disappears.
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| Academic Significance and Societal Importance of the Research Achievements |
ゴムは摩擦係数が高いので種々の物体搬送に使われる．原子間力顕微鏡AFMを使ったナノ・マイクロ領域でのゴム摩擦の要因は解明されているが，靴底などマクロ領域ではゴムの摩擦力は正確には予測できない．その大きな理由は，マクロ領域においてメニスカス力が適切に評価できないことである．研究代表者が開発した広視野レーザ顕微鏡ではマクロ領域のゴム表面全体の真実接触面積Arを精度良く測定できる．マクロ領域においてメニスカス力がArに及ぼす影響が解明できれば，なぜ水が介在するとゴムが滑りやすくなるのか．また，その状態でゴムを擦り続けると摩擦力が高くなるのかを解明でき，ゴムをより良く利用すことができるようになる．
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Report
(3 results)
Research Products
(3 results)
