Results 251 to 260 of about 55,747 (307)
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Mixed lubrication — an overview
Lubrication Science, 1997AbstractThe regime known as ‘mixed’ lubrication lies between those of hydrodynamic and elastohydrodynamic. This paper reviews work on this subject, in order to recognise the key areas of progress, and of ignorance. Film thickness and surface roughness are discussed, to conclude that below certain values of λ, there are limitations to earlier models ...
H A Spikes
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A S L E Transactions, 1975
This paper presents a model for mixed lubrication. The surface asperities are represented by short plasto-elastic cylinders with spherical tops. The heights of these cylinders are assumed to have a Gaussian distribution. By combining the solution of the Reynolds equation and the solution from boundary lubrication theory or the microelastohydrodynamic ...
Yuh-Hwang Tsao, Kin N. Tong
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This paper presents a model for mixed lubrication. The surface asperities are represented by short plasto-elastic cylinders with spherical tops. The heights of these cylinders are assumed to have a Gaussian distribution. By combining the solution of the Reynolds equation and the solution from boundary lubrication theory or the microelastohydrodynamic ...
Yuh-Hwang Tsao, Kin N. Tong
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Lubrication Science, 2003
AbstractThis paper reviews recent research in mixed lubrication, focusing on the current understanding of lubricant entrainment, and thus film thickness, and of friction in thin‐film, rough‐surface lubricated contacts. By combining research using optical interferometry on the experimental side and numerical modelling on the theoretical side, we now ...
H. A. Spikes, A. V. Olver
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AbstractThis paper reviews recent research in mixed lubrication, focusing on the current understanding of lubricant entrainment, and thus film thickness, and of friction in thin‐film, rough‐surface lubricated contacts. By combining research using optical interferometry on the experimental side and numerical modelling on the theoretical side, we now ...
H. A. Spikes, A. V. Olver
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Tribological Behavior of Aqueous Copolymer Lubricant in Mixed Lubrication Regime
ACS Applied Materials & Interfaces, 2016Although a number of experiments have been attempted to investigate the lubrication of aqueous copolymer lubricant, which is applied widely in metalworking operations, a comprehensive theoretical investigation at atomistic level is still lacking. This study addresses the influence of loading pressure and copolymer concentration on the structural ...
Ta, Thi Dinh +6 more
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Enhanced Lubricity in Mixed Alkanethiol Monolayers
The Journal of Physical Chemistry B, 2005The frictional properties of two-component mixed alkanethiol monolayers were investigated with frictional force microscopy. With large chain length differences, the two types of molecules segregated into large islands and reveal similar frictional properties as those of single-component monolayers.
Zuo, L., Xiong, Y., Xie, XC, Xiao, XD
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Mixed Lubrication of Strip Rolling
Tribology Transactions, 1994An analytical model for strip rolling operating in the mixed regime is developed. The model combines analysis for the influence of bulk plastic deformation on the effective hardness of the strip asperities with an approach to allow for the influence of roughness on lubricant flow. An approximate correction for thermal effects is also included.
Shen Sheu, William R. D. Wilson
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Friction Reduction in Mixed Lubrication
Tribology Letters, 2007Minimization of frictional losses in the drivetrain of heavy-duty vehicles is important from both consumer satisfaction and environmental perspectives. Approaches to friction reduction in these components can be evaluated using simulation-based investigations.
Ashlie Martini, Dong Zhu, Qian Wang
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Proceedings of the Institution of Mechanical Engineers, 1972
The phenomena observed when a lubricated contact or bearing is operating under mixed lubrication conditions are assumed to arise from an interaction of the surface asperities or roughness as well as from hydro-dynamic action of the sliding surfaces. It is shown how one of the previously published stochastic models of hydrodynamic lubrication can be ...
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The phenomena observed when a lubricated contact or bearing is operating under mixed lubrication conditions are assumed to arise from an interaction of the surface asperities or roughness as well as from hydro-dynamic action of the sliding surfaces. It is shown how one of the previously published stochastic models of hydrodynamic lubrication can be ...
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Chemical Films and Mixed Lubrication
A S L E Transactions, 1983This paper relates studies of film behavior in mixed lubrication in a concentrated contact. In the simulator, 52100 steel specimens and TCP in hexadecane as lubricant are used. When the pure EHL regime is studied, no solid film is formed on surfaces, but within the boundary lubrication regime, the chemical decomposition of the additive contributes to a
J. M. Georges +3 more
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Mixed Lubrication and Lubricated Wear
1993This review attempts to update our current analytical understanding of the macro-scale lubrication variables such as the average film thickness, lubricant and contact pressures, shear stress, and surface temperature, as well as the micro-scale random variables induced by the randomly distributed asperity contacts.
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