Last edited by Groshakar
Thursday, May 14, 2020 | History

2 edition of Lubricant rheology applied to elastohydrodynamic lubrication found in the catalog.

Lubricant rheology applied to elastohydrodynamic lubrication

W. O. Winer

Lubricant rheology applied to elastohydrodynamic lubrication

by W. O. Winer

  • 6 Want to read
  • 35 Currently reading

Published by National Aeronautics and Space Administration, for sale by the National Technical Information Service in Washington, Springfield, Va .
Written in English

    Subjects:
  • Viscosity.,
  • Hydrodynamics -- Simulation methods.

  • Edition Notes

    StatementWard O. Winer and David M. Sanborn.
    SeriesNASA contractor report ; NASA CR-2837, NASA contractor report -- NASA CR-2837.
    ContributionsSanborn, David M., United States. National Aeronautics and Space Administration., Georgia Institute of Technology.
    The Physical Object
    Paginationx, 204 p. :
    Number of Pages204
    ID Numbers
    Open LibraryOL15222152M

    Book Description. Elastohydrodynamic Lubrication for Line and Point Contacts: Asymptotic and Numerical Approaches describes a coherent asymptotic approach to the analysis of lubrication problems for heavily loaded line and point contacts. This approach leads to unified asymptotic equations for line and point contacts as well as stable numerical algorithms for the solution of these. Fine Tune Your Methods for Solving Elastohydrodynamic Lubrication Problems In most cases, the equations in the book are derived from first principles. The author describes each of the asymptotic and numerical methods in detail, making it easier for readers to apply them to various problems.

    Hydrodynamic Lubrication Journal Bearings • Thrust Bearings Dynamic Properties of Lubricant Films Linearized Spring and Damping Coefficients • Stability of a Flexible Rotor Elastohydrodynamic Lubrication Contact Mechanics • Dimensional Analysis • Film-Thickness Design Formulas • Minimum Film Thickness Calculations. The lubrication regime of many machine elements with non-conformal contacts such as rolling element bearings, gears, etc. is generally classified as elastohydrodynamic lubrication (EHL). In EHL, the non-conformance of the bodies results in high contact pressures Cited by:

    Elastohydrodynamic (EHD) lubrication is found in many of today’s most common machine components like gears, rolling element bearings and cam followers. EHD lubrication features many distinct challenges where the non-conformal nature of the contacts gives rise to elastic deformation of the surfaces and contact pressures up to several gigapascals. applied to the bottom surface of the domain. In the contact region (where p satisfies Reynolds equation), the condition () σ σ22 = =−yy p is applied. Zero stress boundary condition is applied to the other boundaries. • Load equilibrium The external load applied to Cited by: 1.


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Lubricant rheology applied to elastohydrodynamic lubrication by W. O. Winer Download PDF EPUB FB2

Read the latest chapters of Tribology Series atElsevier’s leading platform of peer-reviewed scholarly literature. Lubricant rheology applied to elastohydrodynamic lubrication. Washington: National Aeronautics and Space Administration ; Springfield, Va.: For sale by the National Technical Information Service, INVESTIGATIONS OF LUBRICANT RHEOLOGY AS APPLIED TO ELASTOHYDRODYNAMIC LUBRICATION NASA GRANT NO.

NSG Co-Principal Investigators S. Bair Research Engineer W. Winer Professor for NASA-Lewis Research Center. This book gives a thorough overview on recent developments in lubricant rheology, elastohydrodynamic lubrication and the effects of surface roughness and particulate contamination in the lubricant on the overall behaviour of a heavily loaded lubricated by: Description: This book gives a thorough overview on recent developments in lubricant rheology, elastohydrodynamic lubrication and the effects of surface roughness and particulate contamination in the lubricant on the overall behaviour of a heavily loaded lubricated contact.

One of the aims of the book is to make clear to the reader that a. This book gives a thorough overview on recent developments in lubricant rheology, elastohydrodynamic lubrication and the effects of surface roughness and particulate contamination in the lubricant on the overall behaviour of a heavily loaded lubricated Edition: 1.

A modified torsional Kolsky bar is used to shear a thin annular layer of lubricant held between concentric cylinders. The shear rates obtained range from 4 × 10 3 to 4 × 10 4 s −1; the duration of the shear pulse is about shear stress history and the corresponding shear-rate history are deduced using standard torsional Kolsky bar by: Rheology and elastohydrodynamic lubrication.

[Bo O Jacobson] institution or organization should be applied. Print; E-mail. E-mail. All fields are required. Enter Pitting and micropitting -- Mixed lubrication -- Lubricant contamination -- Influence of residual and static stresses -- Overview of the different parameters.\/span.

"Elastohydrodynamic lubrication (EHL) is a relatively new area in the development of lubrication theory and practice. This monograph is devoted to selected performances of liquid lubricants, particularly mineral oils and synthetic fluids. combines asymptotic and numerical techniques to solve EHL problems for line and point : Hardcover.

loaded contacts, inlet and exit zones, lubrication film thickness, lubricant rheology, grease, lubricant degradation polymer additives Contents 1. Introduction 2. Stress-induced lubricant degradation 3. Basic equations governing the fluid elastohydrodynamic lubrication (EHL) of line and point contacts Equations of fluid motion File Size: KB.

Full text of "NASA Technical Reports Server (NTRS) Lubricant rheology applied to elastohydrodynamic lubrication" See other formats.

Elastohydrodynamic lubrication is a form of hydrodynamic lubrication involving physical interaction between two contacting surfaces and liquid where elastic deformation of the contacting surfaces due to heavily loading applied will affect the elastohydrodynamic pressure and fluid film thickness significantly.

In this paper, a line contact EHL is modeled through the cylinder contact to a flat Author: Dedi Rosa Putra Cupu, Adli Bahari, Kahar Osman, Jamaluddin Sheriff. That classical elastohydrodynamic lubrication (EHL) is not a quantitative field can be illustrated by its failure to provide a consistent and rigorous definition of the viscosity-pressure : Wassim Habchi.

Elastohydrodynamic lubrication (EHL) model predicts that the film thickness h between an elastic sphere and plane decreases with the entrance speed v, following a formula proposed by Dowson and h-v curve, if plotted on log-log scales, will appear as a straight line as shown in Fig.

ed technology now allows to measure the EHL film thickness in a resolution less than nm. Investigations of lubricant rheology as applied to elastohydrodynamic lubrication of lubricant shear rheological behavior in the amorphous solid region and near the liquid-solid transition are.

Lubrication is the process or technique of using a lubricant to reduce friction and wear and tear in a contact between two surfaces.

The study of lubrication is a discipline in the field of tribology. Lubricants can be solids (such as Molybdenum disulfide MoS 2), solid/liquid dispersions (such as grease), liquids (such as oil or water), liquid-liquid dispersions [citation needed] or gases.

The pressure range covered includes both the liquid and glassy states of the lubricant. The results show that a limiting shear stress model is an appropriate model for lubricant behavior under these conditions.

The experimental results also show little change in the Cited by: 4. Lubrication Knowledge Menu. Elastohydrodynamic (EHD) Lubrication. Definition of EHD lubrication.

The lubrication principles applied to rolling bodies, such as ball or roller bearings, is known as elastohydrodynamic (EHD) lubrication. Rolling body lubrication. This book gives a thorough overview on recent developments in lubricant rheology, elastohydrodynamic lubrication and the effects of surface roughness and particulate contamination in the lubricant on the overall behaviour of a heavily loaded lubricated contact.

It is well-documented that parameters, such as film thickness and temperature in EHL contacts, can be measured experimentally using a range of techniques include optical interferometry, ultrasonics, capacitance and infrared emission.

Considerably less is known, however, about the flow of lubricant through such contacts. Information about lubricant flow would greatly benefit the prediction of Cited by:.

Elastohydrodynamic lubrication (EHL) is a mode of fluid-film lubrication in which hydrodynamic action is significantly enhanced by surface elastic deformation and lubricant viscosity increases due to .about rheology than you ever wanted to know.

6 The basics of viscosity index There are many factors to calculating the viscosity of a lubricant. But understanding its temperature in cold and hot environments is the first step. 8 The mysterious world of lubricant additives This handy primer is your guide to theseFile Size: 1MB.the surfaces and support the applied load.

Elastohydrodynamic lubrication is the condition that occurs when a lubricant is introduced between surfaces that are in rolling contact, such as ball and rolling element bearings. In this lubrication regime, the load is sufficiently high enough for the surfaces to elastically deformFile Size: 7KB.