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International Journal for Multiscale Computational Engineering
Fator do impacto: 1.016 FI de cinco anos: 1.194 SJR: 0.554 SNIP: 0.82 CiteScore™: 2

ISSN Imprimir: 1543-1649
ISSN On-line: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.2012003170
pages 27-35

ATOMIC-SCALE FRICTION MODULATION BY ACTUATING SUBSTRATE SUB-NANOMETER VIBRATION

Yilun Liu
Department of Engineering Mechanics, and Center for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
Luming Shen
School of Civil Engineering, University of Sydney
Quanshui Zheng
Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

RESUMO

In this work we study the effect of the substrate vibration on the atomic-scale sliding friction using Tomlinson model. By actuating substrate sub-nanometer vibration parallel to the sliding direction, we find the stick-slip motion can be largely suppressed, resulting in very low sliding friction. The vibration of the substrate will actuate the relative vibration between the sliding tip and the substrate, which will help the tip overcome the substrate surface potential barrier. This mechanism is different from the previous vibration method by actuating vibration perpendicular to the contact surfaces. Our simulation results show that the frequency and amplitude of the substrate vibration are two critical parameters for the friction reduction. Through modulating the vibration frequency, the tip motion can change from stick-slip to continuous sliding, which leads to nearly zero sliding friction. The range of the zero-friction frequencies is determined by the fundamental vibration frequencies of the sliding system. In order to achieve high friction reduction effect the amplitude of the substrate vibration should be larger than one fourth of the period of the surface potential. This work will benefit the design of nearly friction-free interface.


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