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The present paper is devoted to a theoretical analysis of sliding friction under the influence of oscillations perpendicular to the sliding plane. In contrast to previous works we analyze the influence of the stiffness of the tribological contact in detail and also consider the case of large oscillation amplitudes at which the contact is lost during a part of the oscillation period, so that the sample starts to “jump”. It is shown that the macroscopic coefficient of friction is a function of only two dimensionless parameters—a dimensionless sliding velocity and dimensionless oscillation amplitude. This function in turn depends on the shape of the contacting bodies. In the present paper, analysis is carried out for two shapes: a flat cylindrical punch and a parabolic shape. Here we consider “stiff systems”, where the contact stiffness is small compared with the stiffness of the system. The role of the system stiffness will be studied in more detail in a separate paper.


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Reduction of friction by normal oscillations. I. Influence of contact stiffness

Show Author's information M. POPOV1,2,3( )V. L. POPOV1,2,3N. V. POPOV1
 Berlin University of Technology, Berlin 10623, Germany
 Tomsk Polytechnic University, Tomsk 634050, Russia
 Tomsk State University, Tomsk 634050, Russia

Abstract

The present paper is devoted to a theoretical analysis of sliding friction under the influence of oscillations perpendicular to the sliding plane. In contrast to previous works we analyze the influence of the stiffness of the tribological contact in detail and also consider the case of large oscillation amplitudes at which the contact is lost during a part of the oscillation period, so that the sample starts to “jump”. It is shown that the macroscopic coefficient of friction is a function of only two dimensionless parameters—a dimensionless sliding velocity and dimensionless oscillation amplitude. This function in turn depends on the shape of the contacting bodies. In the present paper, analysis is carried out for two shapes: a flat cylindrical punch and a parabolic shape. Here we consider “stiff systems”, where the contact stiffness is small compared with the stiffness of the system. The role of the system stiffness will be studied in more detail in a separate paper.

Keywords: sliding friction, contact stiffness, coefficient of friction, active control of friction, out-of-plane oscillation

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Publication history
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Publication history

Received: 04 June 2016
Revised: 25 September 2016
Accepted: 29 November 2016
Published: 07 March 2017
Issue date: March 2017

Copyright

© The author(s) 2016

Acknowledgements

This work was supported in part by the Ministry of Education of the Russian Federation, by COST Action MP1303 and the Deutsche Forschungsgemeinschaft.

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