Construction of friction laws that rationally describe stiction accompanied by slow creep

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01236
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 18040:Machine elements and tribology-related
• Research Institution: Yokohama National University
• Principal Investigator: Nakano Ken 横浜国立大学, 大学院環境情報研究院, 教授 (30292642)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 摩擦則 / 静摩擦 / 動摩擦 / 固着 / すべり

Outline of Final Research Achievements

Since the famous Coulomb studies, we believe there exist two types of friction (i.e., static and kinetic friction). However, several precise measurements revealed that an extremely slow slip occurs in a stick phase, meaning that the existence of static friction is not proven scientifically. In this project, we conducted international collaborating studies (including theoretical, experimental, and numerical analysis) to construct the friction law that rationally explains the stick phase with slow slippage. As a result, we found two mechanisms of dynamic stiction modes showing quasi-stick phases with slow slippage in two ideal mechanical systems (i.e., the rigid- and flexible-contact systems).

Free Research Field

トライボロジー

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は、自然法則の一つとして高校の物理にも登場する「クーロンの摩擦則」の一般常識を覆し、これまで「固着＝静摩擦」という先入観に基づき曖昧に理解されてきた摩擦現象を根本から見直すべきであることを示唆している。固体摩擦理論の原理原則の再構築を通して、固体摩擦が関与する広範な分野の科学と技術の中に、新たな潮流を生み出すことが見込まれる。