Identification of the Shear Plane During Sliding of Solid Boundary Films: Potassium Chloride Films on Iron

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• 作者：Hongyu Gao ; Wilfred T. Tysoe ; Ashlie Martini
• 关键词：Boundary lubrication friction ; Friction mechanisms ; Dynamic modeling
• 刊名：Tribology Letters
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：62
• 期：1
• 全文大小：1,530 KB
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• 作者单位：Hongyu Gao (1)
  Wilfred T. Tysoe (2)
  Ashlie Martini (1)
  
  1. School of Engineering, University of California – Merced, Merced, CA, 95343, USA
  2. Department of Chemistry and Laboratory for Surface Studies, University of Wisconsin – Milwaukee, Milwaukee, WI, 53211, USA
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Tribology, Corrosion and Coatings
  Surfaces and Interfaces and Thin Films
  Theoretical and Applied Mechanics
  Physical Chemistry
  Nanotechnology
  
• 出版者：Springer Netherlands
• ISSN：1573-2711

文摘

The commonly observed linear variation in shear strength with contact pressure is explored using a model system consisting of a potassium chloride (KCl) film between two iron counterfaces, for which a linear dependence has been found experimentally. The effect of artificially changing the KCl lattice spacing is explored using molecular dynamics (MD) simulations, where the interaction potential between the iron and KCl was previously optimized using surface science experiments for KCl on iron. It is found that the shear plane can change from occurring within the KCl film to taking place between the film and iron, depending on lattice spacing. In addition, shear within the KCl film leads to an increase in friction force with lattice spacing, while shear at the KCl–Fe interface leads to a decrease in friction with lattice spacing. The transition between the two regimes depends on the applied load. MD simulations of an equilibrium KCl film reveal that shear occurs at the KCl–iron interface, consistent with experiment, where no KCl transfer is found. Accordingly, the friction force increases with load, where the MD simulations yield a proportionality constant between shear strength and contact pressure of 0.115 ± 0.004, in excellent agreement with the experimental value of 0.14 ± 0.02. This result can be interpreted using the Prandtl–Tomlinson model where the pressure dependence arises from the external work carried out on the system due to the change in interlayer spacing at the sliding interface.