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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

Matsuoka,  H., and Kato,  T., 1996, “Discrete Nature of Ultrathin Lubrication Film between Mica Surfaces,” ASME J. Tribol., 118, pp. 832–838.
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Yanagisawa,  M., Sato,  A., and Ajiki,  K., 1998, “Lubricant Design for Contact Recording Systems,” IEICE Trans. Electro., E81-C, pp. 343–348.
Granick,  S., 1991, “Motions and Relaxations of Confined Liquids,” Science, 253, pp. 1374–1379.
Gee,  M. L., McGuiggan,  P. M., Israelachvili,  J. N., and Homola,  A. M., 1990, “Liquid to Solidlike Transitions of Molecularly Thin Films Under Shear,” J. Chem. Phys., 93, pp. 1895–1906.
Mate,  C. M., McClelland,  G. M., , 1987, “Atomic-Scale Friction of a Tungsten Tip on a Graphite Surface,” Phys. Rev. Lett., 59, pp. 1942–1945.
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Thompson,  P. A., and Robbins,  M. O., 1990, “Origin of Stick-Slip Motion in Boundary Lubrication,” Science, 250, pp. 792–794.
Thompson,  P. A., and Grest,  G. S., 1992, “Phase Transitions and Universal Dynamics in Confined Films,” Phys. Rev. Lett., 68, pp. 3448–3451.
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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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