Abstract
The relative fluctuation of sliding friction force in a stationary friction regime has been estimated by the statistic theory of the fluctuation of adaptive physical variables. General mathematical equations and corresponding estimations of relative fluctuations have been given for various friction regimes, such as the regime of mixed and boundary friction, including friction with cladding metal nanoparticles in lubricant and friction with selective transfer. It has been found that relative fluctuations of friction forces are fairly high compared with the fluctuation of physical variables related to the volume of thermodynamic systems. Relative fluctuations for a mixed friction regime are particularly high and can reach 1–10% of the average friction force.
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