Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2011-04-29
Physical Review E: Statistical, Nonlinear, and Soft Matter Physics, 83 (2011) 046129-1-9
Physics
Condensed Matter
Statistical Mechanics
Scientific paper
10.1103/PhysRevE.83.046129
We investigate the velocity dependence of kinetic friction with a model which makes minimal assumptions on the actual mechanism of friction so that it can be applied at many scales provided the system involves multi-contact friction. Using a recently developed master equation approach we investigate the influence of two concurrent processes. First, at a nonzero temperature thermal fluctuations allow an activated breaking of contacts which are still below the threshold. As a result, the friction force monotonically increases with velocity. Second, the aging of contacts leads to a decrease of the friction force with velocity. Aging effects include two aspects: the delay in contact formation and aging of a contact itself, i.e., the change of its characteristics with the duration of stationary contact. All these processes are considered simultaneously with the master equation approach, giving a complete dependence of the kinetic friction force on the driving velocity and system temperature, provided the interface parameters are known.
Braun Oleg
Peyrard Michel
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