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Superlubricity and active friction control have been extensively researched in order to reduce the consumption of fossil energy, the failure of moving parts, and the waste of materials. The vibration-induced superlubricity (VIS) presents a promising solution for friction reduction since it does not require high-standard environment. However, the mechanism underlying the VIS remains unclear since the atomic-scale information in a buried interface is unavailable to experimental methods. In this paper, the mechanism of VIS was examined via numerical calculation based on the Prandtl–Tomlinson (PT) model and molecular dynamics (MD) simulations. The results revealed that the pushing effect of stick–slip is one of the direct sources of friction reduction ability under vibrational excitation, which was affected by the response amplitude, frequency, and the trace of the tip. Moreover, the proportion of this pushing effect could be modulated by changing the phase difference when applying coupled vibrational excitation in x- and z-axis. This results in a significant change in friction reduction ability with phase. By this way, active friction control from the stick–slip to superlubricity can be achieved conveniently.


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Active control of friction realized by vibrational excitation: Numerical simulation based on the Prandtl–Tomlinson model and molecular dynamics

Show Author's information Xiao MAXinfeng TAN( )Dan GUO( )Shizhu WEN
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China

Abstract

Superlubricity and active friction control have been extensively researched in order to reduce the consumption of fossil energy, the failure of moving parts, and the waste of materials. The vibration-induced superlubricity (VIS) presents a promising solution for friction reduction since it does not require high-standard environment. However, the mechanism underlying the VIS remains unclear since the atomic-scale information in a buried interface is unavailable to experimental methods. In this paper, the mechanism of VIS was examined via numerical calculation based on the Prandtl–Tomlinson (PT) model and molecular dynamics (MD) simulations. The results revealed that the pushing effect of stick–slip is one of the direct sources of friction reduction ability under vibrational excitation, which was affected by the response amplitude, frequency, and the trace of the tip. Moreover, the proportion of this pushing effect could be modulated by changing the phase difference when applying coupled vibrational excitation in x- and z-axis. This results in a significant change in friction reduction ability with phase. By this way, active friction control from the stick–slip to superlubricity can be achieved conveniently.

Keywords: superlubricity, vibration, friction control, molecular dynamics (MD)

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Publication history

Received: 04 December 2021
Revised: 20 February 2022
Accepted: 17 May 2022
Published: 19 November 2022
Issue date: July 2023

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© The author(s) 2022.

Acknowledgements

This research is financially supported by the National Natural Science Foundation of China (Grant Nos. 52175175 and 51527901).

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