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      The viscosity at the glass transition of a liquid lubricant

      Friction

      Tsinghua University Press

      elastohydrodynamic lubrication, glass transition, high pressure viscosity, EHL friction

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          Abstract

          In the classical study of elastohydrodynamic lubrication (EHL) which does not employ real, measurable viscosity in analysis, the possibility of a glass transition has not been considered in many years. Indeed, the two rheological assumptions of classical EHL, the Newtonian inlet and the equivalence of a traction curve to a flow curve, would not have persisted so long had the pressure dependence of the viscosity been accurately stated. With the recent appearance of viscosity obtained from viscometers in EHL analysis, the possibility of a glass transition in the contact should be reexamined, especially for the fragile traction fluids. This article employs published data for a synthetic cycloaliphatic hydrocarbon to estimate the glass transition viscosity so that, when using real viscosities in EHL simulations, the state of the liquid may be assessed. Far into the glassy state the liquid should be treated as an elastic solid with a yield stress.

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          Most cited references 19

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          Relaxation in liquids, polymers and plastic crystals — strong/fragile patterns and problems

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            Dielectric properties of glycerol in the range 0.1–105Hz, 218–357 K, 0–53 kb

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                Author and article information

                Journal
                Tsinghua Science and Technology
                Friction
                Tsinghua University Press (Xueyuan Building, Tsinghua University, Beijing 100084, China )
                2223-7690
                05 February 2019
                : 07
                : 01
                : 86-91 (pp. )
                Affiliations
                Center for High-Pressure Rheology, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta GA 30332-0405, USA
                Author notes
                * Corresponding author: Scott BAIR, E-mail: scott.bair@ 123456me.gatech.edu

                Scott BAIR. He received the B.S., M.S. and Ph.D degrees in mechanical engineering from Georgia Institute of Technology where he is Regents’ Researcher in the George W. Woodruff School of Mechanical Engineering. He has been performing experimental research in high pressure rheology for 44 years and has eleven U.S. patents and has published more than 180 journal articles.

                Article
                2223-7690-07-01-86
                10.1007/s40544-018-0210-1

                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                Page count
                Figures: 7, Tables: 2, References: 22, Pages: 6
                Categories
                Short Communication

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