The lubrication by thin film has become a very important role in micro machine, magnetic storage device and so on. As the thickness of lubricant film becomes thinner to several nanometers, the conventional law of lubrication becomes unable to use. Nonequilibrium molecular dynamics simulation (NEMD) was carried out to investigate the dynamic behavior of thin lubricant film confined between walls. The model used in these simulations is composed of two solid walls and fluorocarbon polymer lubricant. One of the walls is supporting a load and at the same time moving at constant velocity. Results indicate that the frictional behavior of confined lubricant varied with load; velocity field in the film retain liquid like structure under low load conditions, on the other hand, under high load conditions lubricant film becomes solidified and periodical stick and slip motion is observed at the layer near the wall. At the same time periodically vibrating friction force is observed. In this case, radius of gyration of lubricant molecules also changes periodically. It is concluded that the periodical vibration of friction force is caused by stick-slip with molecular deformation.
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e-mail: kentaro@fel.t.u-tokyo.ac.jp
e-mail: kato.t@aist.go.jp
e-mail: ymats@mech.t.u-tokyo.ac.jp
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July 2003
Technical Papers
Molecular Dynamics Simulation of Vibrational Friction Force Due to Molecular Deformation in Confined Lubricant Film
Kentaro Tanaka,
e-mail: kentaro@fel.t.u-tokyo.ac.jp
Kentaro Tanaka
Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
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Takahisa Kato,
e-mail: kato.t@aist.go.jp
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
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Yoichiro Matsumoto
e-mail: ymats@mech.t.u-tokyo.ac.jp
Yoichiro Matsumoto
Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
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Kentaro Tanaka
Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
e-mail: kentaro@fel.t.u-tokyo.ac.jp
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
e-mail: kato.t@aist.go.jp
Yoichiro Matsumoto
Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
e-mail: ymats@mech.t.u-tokyo.ac.jp
Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division March 28, 2002; revised manuscript received September 5, 2002. Associate Editor: J. A. Tichy.
J. Tribol. Jul 2003, 125(3): 587-591 (5 pages)
Published Online: June 19, 2003
Article history
Received:
March 28, 2002
Revised:
September 5, 2002
Online:
June 19, 2003
Citation
Tanaka, K., Kato, T., and Matsumoto, Y. (June 19, 2003). "Molecular Dynamics Simulation of Vibrational Friction Force Due to Molecular Deformation in Confined Lubricant Film ." ASME. J. Tribol. July 2003; 125(3): 587–591. https://doi.org/10.1115/1.1538194
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