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Relevant bibliographies by topics / Isoviscous elastohydrodynamic lubrication

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Journal articles
Dissertations / Theses
Conference papers

Academic literature on the topic 'Isoviscous elastohydrodynamic lubrication'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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Journal articles on the topic "Isoviscous elastohydrodynamic lubrication"

1

Shahrivar, K., E. M. Ortigosa-Moya, R. Hidalgo-Alvarez, and J. de Vicente. "Isoviscous elastohydrodynamic lubrication of inelastic Non-Newtonian fluids." Tribology International 140 (December 2019): 105707. http://dx.doi.org/10.1016/j.triboint.2019.03.065.

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2

Hall, R. W., and M. D. Savage. "Two-Dimensional Elastohydrodynamic Lubrication Part 2: Solution of the Line Contact Problem." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 202, no. 5 (1988): 354–60. http://dx.doi.org/10.1243/pime_proc_1988_202_133_02.

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Following Part 1, this paper describes a method for solving the line contact problem in elastohydrodynamic lubrication. Using results derived in Part 1 together with the Reynolds lubrication equation and boundary conditions, an iterative scheme is designed so as to yield pressures, displacements and film thicknesses within a parabolic, lubricated contact. Converged numerical solutions are readily obtained over a parameter range which includes both isoviscous and weakly piezoviscous contacts.

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3

Hooke, C. J. "The Elastohydrodynamic Lubrication of Elliptical Point Contacts Operating in the Isoviscous Region." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 209, no. 4 (1995): 225–34. http://dx.doi.org/10.1243/pime_proc_1995_209_433_02.

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The elastohydrodynamic lubrication of point contacts is examined and results for the minimum film thickness are presented for a wide range of radius ratios and operating conditions. The results are compared with the predictions of the appropriate regime formulae. Although these formulae give a reasonable estimate of the contact's behaviour, the actual clearances are often substantially different, particularly close to the regime boundaries. Interpolation equations for seven values of radius ratio are given and these should be sufficient to allow the minimum clearance to be estimated for most i

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4

Balan, Mihaela Rodica, Vasile Ciprian Stamate, Luc Houpert, Ana Tufescu, and Dumitru Olaru. "Influence of the Geometry on the Rolling Friction Torque in Lubricated Ball-Race Contacts." Applied Mechanics and Materials 658 (October 2014): 271–76. http://dx.doi.org/10.4028/www.scientific.net/amm.658.271.

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Based on a theoretical model and an experimental methodology for defining the friction torque in a modified thrust ball bearing having only 3 balls and presented in [2], the authors experimentally investigated the influence of the ball diameter on friction torque when operating in mixed and full film lubrication conditions and maintaining the normal load, the race curvature and oil viscosity constant. The experiments were realized using ball diameters between 7.938 mm and 3 mm corresponding to maximum Hertzian pressure between 0.264 GPa and 1 GPa and a rotational speed between 60 rpm to 240 rp

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Jang, Siyoul, and John Tichy. "Rheological Models for Thin Film EHL Contacts." Journal of Tribology 117, no. 1 (1995): 22–28. http://dx.doi.org/10.1115/1.2830602.

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Rheological behavior in concentrated contacts has been studied extensively. In certain conditions such as a rough concentrated contact or sliding of nominally flat surfaces, films may be of molecular (nanometer) scale. The question arises as to whether the application of any viscous fluid model is appropriate. In this study, elastohydrodynamic lubrication analysis is performed on three candidate rheological models: (1) the classical case of viscosity variation with pressure, (2) an isoviscous model which idealizes porous layers on the solid surfaces representing the molecular microstructure, a

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6

Puiu, George Constantin, and Vasile Puiu. "The Influence of the Operating Conditions on the Lubrication Regimes of Ball Screws." Applied Mechanics and Materials 371 (August 2013): 581–85. http://dx.doi.org/10.4028/www.scientific.net/amm.371.581.

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In point contact related applications (ball bearings, ball-screws) the minimum and the central film thickness of lubricant have a particular importance. The literature presents various numerical solutions to determine these parameters in the case of elliptical contacts [1-4]. Most of them refer to the fully developed elastohydrodynamic lubrication regime (EHD). Hamrock [5] proposes four different lubrication regimes depending on the size and importance of two physical phenomena that occur in contact: elastic deformation of the bodies in contact under a given load and lubricant viscosity variat

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7

Jalali- Vahid, D., Z. M. Jin, and D. Dowson. "Isoviscous elastohydrodynamic lubrication of circular point contacts with particular reference to metal-on-metal hip implants." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 217, no. 5 (2003): 397–402. http://dx.doi.org/10.1243/135065003322445313.

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A full numerical analysis of elastohydrodynamic lubrication (EHL) of circular point contacts was carried out in the present study under isoviscous conditions with particular reference to metal-on-metal artificial hip joints, using a modified Newton-Raphson method. It was found to be possible to incorporate directly the physiological conditions, representative of typical metal-on-metal hip implants under in-vivo walking or in-vitro simulator testing, in the present numerical solutions. The predicted minimum and central film thicknesses were compared favourably with those estimated from various

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8

Lee, Rong-Tsong, and B. J. Hamrock. "Squeeze and Entraining Motion in Nonconformal Line Contacts. Part I—Hydrodynamic Lubrication." Journal of Tribology 111, no. 1 (1989): 1–7. http://dx.doi.org/10.1115/1.3261873.

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An analytical solution to the problem of combined entraining and normal squeeze motion in nonconformal line contacts hydrodynamically lubricated with an isoviscous, incompressible lubricant has been obtained without any limitations on dimensionless load, dimensionless entraining velocity, and dimensionless velocity parameter. The dimensionless load and entraining velocity are fixed for a complete range of operating parameters for both normal approach and separation. Results show that the lubrication of the outlet boundary and the location of the maximum pressure move upstream into the inlet re

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9

Ashman, D. "Investigation of the Failure of Heavily Loaded Journal Bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 208, no. 3 (1994): 167–71. http://dx.doi.org/10.1243/pime_proc_1994_208_367_02.

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This paper gives details of a combined theoretical and experimental investigation of a plain journal bearing under heavily loaded conditions together with a metrological study of the bearing geometry. It was found that under high loading conditions a simplified analytical expression relating the Sommerfeld number to the non-dimensional minimum film thickness, using a hydrodynamic solution of the isoviscous form of the Reynolds equation, could be developed. An alternative theoretical solution based on elastohydrodynamic lubrication was also considered. In addition, experimental work determined

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10

Chen, H., A. Yoshimura, and T. Ohyama. "Numerical analysis for the influence of water film on adhesion between rail and wheel." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 212, no. 5 (1998): 359–68. http://dx.doi.org/10.1243/1350650981542173.

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The adhesion force between rail and wheel is one of the important factors for proceeding towards the realization of high-speed railway. On the other hand, it is supposed that the water film formed between the rail and wheel has a remarkable influence on the adhesion force under rainy condition at higher speeds. In this paper, taking Bett and Cappi's viscosity values of water, which show quite a different behaviour from the viscosity of oil, the influence has been investigated of important factors such as rolling speed, contact pressure and temperature on water film thickness for a smooth surfa

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Dissertations / Theses on the topic "Isoviscous elastohydrodynamic lubrication"

1

Jaroš, Tomáš. "Utváření mazacího filmu v poddajném kontaktu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318376.

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This diploma thesis deals with the study of film formation in compliant contact. Primary attention is dedicated to the influence of the entrainment speed and slide-to-roll ratio (SRR) on the central film thickness. Based on a research study of the available experimental methods, the fluorescence microscopy was used to achieve the aim of the work. Experiments were realized in ball-on-disk configuration. Firstly, a validation of the method was performed where the solid contact of the ceramic ball and the glass disk was analyzed. Since the measured values were in a good agreement with the theoret

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2

Dočkal, Kryštof. "Analýza mazaného kontaktu poddajných těles." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231789.

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This diploma thesis deals with the proposal of methodology for film thickness eva- luation within compliant contacts. With respect to characteristics of such contact pairs, like variable film thickness, high surface roughness, or poor conductivity and reflectivity, the usage of conventional experimental methods is particularly complicated. In present study, an optical method based on the principle of fluo- rescent microscopy was employed in present thesis. An evaluation algorithm in- volving background normalization and calibration of fluorescent intensity to film thickness was created in a fo

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Conference papers on the topic "Isoviscous elastohydrodynamic lubrication"

1

Lee, S., and N. D. Spencer. "Influence of Surface Modification on Aqueous Lubrication of Elastomers." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63234.

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Water is generally not an efficient lubricant for most tribosystems due to its extremely low pressure-coefficient of viscosity. This barrier is less important, however, when elastomers are employed as tribopairs, since a low-pressure, conformal contact is readily achieved under these conditions, and thus the isoviscous-elastic lubrication (or soft elastohydrodynamic lubrication, “soft EHL”) mechanism can be activated. Isoviscous-elastic lubrication does not necessitate the increase of viscosity under pressure. The aqueous lubrication of elastomers, however, requires a careful control of surfac

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