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Affection of acoustic oscillations on friction effects on atomic level using prandtl-tomlinson model

Keywords:

V.B. Oshurko - Dr.Sc. (Phys.-Math.), Professor, Head of Department, Moscow State Technological University STANKIN. E-mail: vbo08@yandex.ru K.G. Solomakho - Post-graduate Student, Moscow State Technological University STANKIN. E-mail: kirgeosol@gmail.com V.S. Veretin - Ph.D. (Phys.-Math.), Associate Professor, Plekhanov Russian University of Economics (Moscow). E-mail: ilavvsse@mail.ru


Dependence of friction coefficient and wear of surface in probe experiment (and its modification with Prandtl-Tomlinson model) in presence of small acoustic oscillations (magnitude ~ 0,1 Å, frequency 1…1000 GHz) has been studied by molecular dynamics simula-tions. It was found that lateral force and friction coefficient may be sufficiently decreased in presence of acoustic wave. It’s supposed that mechanism of this phenomenon is transmission of normal-oriented impulse from observed substrate to the probe. It is shown that rising of environment temperature causes a linear increase in the frictional force. It was revealed that a gradual reduction in friction force is observed with an increase in the amplitude of the acoustic oscillations. This is a consequence of reducing the number of contacting atoms. We haven’t found out any resonance effects on stick-slip frequency during application of acoustic oscillations to the substrate. In case of ploughing the wear of surfaces is also smaller under action of acoustic wave. Possible mechanisms of these phenomena are discussed.
References:

 

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May 29, 2020

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