Influence of withdrawal speed on adhesion force condiering the viscoelasticity

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14641
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 18040:Machine elements and tribology-related
• Research Institution: Tottori University
• Principal Investigator: Ishikawa Takumi 鳥取大学, 工学研究科, 助教 (70845164)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 凝着力 / 時間依存性 / 引き離し速度 / 総接触時間 / 粘弾性特性 / JKR理論 / 表面力測定装置のシミュレーション

Outline of Final Research Achievements

This study investigates the time dependence of adhesion force, which has not been clarified previously. To investigate the time dependence property on adhesion force, the surface force between two materials was measured using the surface force apparatus by changing the contact time and the withdrawal speed during the experiment. The results showed that the adhesion force increased as the withdrawal speed and contact time increased. By changing the combination of materials between the two surfaces, we found that the time dependence of the adhesion force was mainly dominated by the viscoelasticity of the materials. The simulation of the surface force apparatus was conducted and showed good agreement with the experimental results.

Free Research Field

トライボロジー

Academic Significance and Societal Importance of the Research Achievements

本研究では引き離し速度と接触時間が凝着力に大きな影響を与えることを明らかにした．また，表面力測定装置のシミュレーションを行うことにより，引き離し速度と接触時間が凝着力に与える影響を定量化した．これらの結果は表面力が支配的となるマイクロデバイスの設計や性能向上に役立つ．また，本研究は２面間の垂直方向に働く表面力を主眼に置いた研究であるが，せん断方向に働く摩擦力も表面力と切り離せない関係にある．つまり，今後の摩擦・摩耗の分野に波及効果があり，更なる低摩擦・高耐久性を持った材料の組み合わせの選定にも役立つ可能性がある．