Abstract
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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Acknowledgments
We are grateful for the contributions of Jianguo Wu, Dr. Qunyang Li and Dr. Robert Carpick and to the National Science Foundation for its support via award CMMI- 0758604. Work at Los Alamos National Laboratory (LANL) was supported by the United States Department of Energy (U.S. DOE) Office of Basic Energy Sciences, Materials Sciences and Engineering Division, and by the LANL Laboratory Directed Research and Development Program. LANL is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. DOE under Contract No. DE-AC52-06NA25396.
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Dong, Y., Perez, D., Voter, A.F. et al. The Roles of Statics and Dynamics in Determining Transitions Between Atomic Friction Regimes. Tribol Lett 42, 99–107 (2011). https://doi.org/10.1007/s11249-011-9750-5
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DOI: https://doi.org/10.1007/s11249-011-9750-5