Journal
TRIBOLOGY LETTERS
Volume 42, Issue 1, Pages 99-107Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11249-011-9750-5
Keywords
Nanotribology; Stick-slip; Dynamic modeling; Friction mechanisms
Categories
Funding
- National Science Foundation [CMMI- 0758604]
- United States Department of Energy (U.S. DOE) Office of Basic Energy Sciences, Materials Sciences and Engineering Division
- LANL Laboratory Directed Research and Development Program
- U.S. DOE [DE-AC52-06NA25396]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1068741] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0758604] Funding Source: National Science Foundation
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We introduce a model AFM tip/substrate system that includes full atomistic detail as well as system compliance to study the transitions between three regimes of atomic friction: smooth sliding, stick-single slip, and stick-multiple slip. We characterize these atomic friction regimes in terms of static and dynamic effects, and investigate how the slip modes affect the mean friction. Molecular statics calculations show that reduced-order model predictions of possible transitions between slip regimes are generally adequate for a fully atomistic system, even for complex reaction coordinates. However, molecular dynamics simulations demonstrate that, while static features of the system govern possible slip regimes, dynamic effects ultimately determine actual transitions between slip regimes.
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