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TECHNICAL PAPERS

Molecular Dynamics Simulation of Vibrational Friction Force Due to Molecular Deformation in Confined Lubricant Film

[+] Author and Article Information
Kentaro Tanaka, Yoichiro Matsumoto

Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

Takahisa Kato

Institute of Mechanical Systems Engineering, National Institute of Advanced Industrial Science and Technology (AIST), 2-1 Namiki, Tsukuba-shi, Ibaraki, 305-8564, Japan

J. Tribol 125(3), 587-591 (Jun 19, 2003) (5 pages) doi:10.1115/1.1538194 History: Received March 28, 2002; Revised September 05, 2002; Online June 19, 2003
Copyright © 2003 by ASME
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References

Figures

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Snap shot of a simulation cell
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Molecular model of PFPE Zdol (HOCH2CF2(OC2F4)p(OCF2)qOCF2CH2OH (p=q=5), Molecularweight is 1088 g/mol)
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The time evolution of friction force (a), and auto-correlation coefficient of friction force (b) under the load 0.15 GPa. The friction force averaged for 150–300 ps is 0.11 GPa.
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Density distribution and velocity field under the load 0.15 GPa. The opened circles show the velocity field and the solid line shows the density distribution.
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The time evolution of friction force (a), and auto-correlation coefficient of friction force (b) under the load 1.01 GPa. The friction force averaged for 150–300 ps is 0.17 GPa.
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The time evolution of friction force (a), and auto-correlation coefficient of friction force (b) under the load 2.1 GPa. The friction force averaged for 150–300 ps is 0.29 GPa.
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The relation between friction coefficient and slip ratio as a function of load. Opened circles show the friction coefficient and filled circles show the slip ratio.
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The time evolution of Rg and Rgx under the load 2.1 GPa
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A part of Fig. 7(a) (A: friction force is increasing, B: friction force is decreasing)
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The velocity field of period A and B
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Schematic diagram of stick-slip motion

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