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All-Atom Molecular Dynamics Simulation of Submicron Thickness EHL Oil Film

[+] Author Affiliations
Hitoshi Washizu, Shuzo Sanda, Shi-Aki Hyodo, Toshihide Ohmori

Toyota Central R&D Labs., Inc., Nagakute, Aichi, Japan

Noriaki Nishino

Toyota Motor Corporation, Susono, Shizuoka, Japan

Atsushi Suzuki

Toyota Motor Corporation, Toyota, Aichi, Japan

Paper No. IJTC2007-44179, pp. 167-169; 3 pages
doi:10.1115/IJTC2007-44179
From:
  • ASME/STLE 2007 International Joint Tribology Conference
  • ASME/STLE 2007 International Joint Tribology Conference, Parts A and B
  • San Diego, California, USA, October 22–24, 2007
  • Conference Sponsors: Tribology Division
  • ISBN: 0-7918-4810-8 | eISBN: 0-7918-3811-0
  • Copyright © 2007 by ASME

abstract

All-atom molecular dynamics simulations of an elastohydrodynamic lubricating oil film have been performed to study the effect of the oil film thickness (large spatial scale; thickness: 430 nm, MD time: 25 ns) and the effect of pressure (long time scale; thickness: 10 nm, MD time: 50 ns, external pressure: 0.1 to 8.0 GPa). Fluid layers of n-hexane are confined between two solid Fe plates by a constant normal force. Traction simulations are performed by applying a relative sliding motion to the Fe plates. In a long spatial scale simulation, the mean traction coefficient was 0.03, which is comparable to the experimental value of 0.02. In a long time scale simulation, a transition of the traction behavior is observed around 0.5 GPa to 1.0 GPa which corresponds to a change from the viscoelastic region to the plastic-elastic region which have been experimentally observed. This phase transition is related to a suppressed fluctuation of the molecular motion.

Copyright © 2007 by ASME

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