スリップスティックと摩擦力の進化
Oded Ben-David1, Shmuel M Rubinstein, Jay Fineberg
1The Racah Institute of Physics, The Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904, Israel.
Nature
|January 8, 2010
まとめ
摩擦強さは,急速な接触面の縮小と滑りから,より遅い動きと老化まで,4つの異なる段階を経て進化します. この研究は,マイクロ秒から秒までの時間スケールにおけるインターフェース強さの進化を詳細に説明しています.
科学分野:
- 物理 物理学 物理学とは
- マテリアルサイエンス 材料科学
- 地質物理学 地質物理学とは地質物理学です.
背景:
- 摩擦強さは,地震動力学やハードドライブ技術などのアプリケーションに不可欠です.
- インターフェースの強さは,実際の接触面と,離散接触の切断強度に依存します.
- 摩擦的進化には,迅速な脱離/再結合と,ゆっくりとした接触の若返りがあります.
研究 の 目的:
- 幅広い時間スケールにおける摩擦力の進化を調査する.
- ローカルコンタクトエリアとスライド中のインターフェースの動きを同時に測定します.
- マイクロ秒から秒へと摩擦力の進化の異なる段階を識別する.
主な方法:
- リアルコンタクトエリアとインターフェーススリップの継続的な測定.
- マイクロ秒から100秒のタイムスケールまでの摩擦進化の観測.
- 裂け目のようなフロント,急速な滑り,遅い滑り,老化段階の分析.
主要な成果:
- コンタクトエリアの縮小は,裂け目のようなフロントを介してマイクロ秒以内に発生します.
- 骨折によって強度が低下したため,急速な滑り始めます.
- スリップの移行は速度を遅らせ,その後,接触面積の増加 (老化) が起こります.
- 老化行動は,単一の対数予測から逸脱して,短い時間でカットオフを示します.
結論:
- 摩擦力の進化は,異なる相互に関連した段階を持つダイナミックなプロセスです.
- この研究は,初期運動から停止までの摩擦力の変化に関する包括的なモデルを提供します.
- これらの相を理解することは,さまざまなアプリケーションにおける摩擦の予測と制御の鍵です.
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