Elastohydrodynamic lubrication of rectangular contacts
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Elastohydrodynamic lubrication of rectangular contacts by Bernard J. Hamrock

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Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service in Washington, D.C, [Springfield, Va .
Written in English


  • Lubrication and lubricants.,
  • Bearings (Machinery),
  • Rolling contact.

Book details:

Edition Notes

StatementBernard J. Hamrock and Bo O. Jacobson.
SeriesNASA technical paper -- 2111.
ContributionsJacobson, Bo O., 1942-, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch.
The Physical Object
Pagination27 p. :
Number of Pages27
ID Numbers
Open LibraryOL17829386M

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A procedure is outlined for the numerical solution of the complete elastohydrodynamic lubrication of rectangular contacts incorporating a non-Newtonian fluid model. The approach uses a Newtonian model as long as the shear stress is less than a limiting shear by: The analysis of an isothermal elastohydrodynamic lubrication (EHL) point contact was evaluated numerically. This required the simultaneous solution of the elasticity and Reynolds equations. In the elasticity analysis the contact zone is divided into equal rectangular areas and it is assumed that a uniform pressure is applied over each by: The paper presents a numerical solution for the elastohydrodynamic lubrication of low modulus point contacts which is broadly equivalent to the theory of .   Chapter Eighteen of Fundamentals of Fluid Film Lubrication by Bernard J. Hamrock, Steven R. Schmid, and Bo O. Jacobson is entitled Elastohydrodynamic Lubrication of Rectangular gular EHL contacts are also known as EHL line contacts. This chapter describes how to numerically solve for this category of contacts, discusses the .

Elastohydrodynamic lubrication is the condition that occurs when a lubricant is introduced between surfaces that are in rolling/sliding contact, such as ball and rolling element bearings, gears, etc. In this lubrication regime, the load is sufficiently high enough for the surfaces to elastically deform during the hydrodynamic action. Procedures outlined by the authors in an earlier publication () on theoretical formulation for isothermal elastohydrodynamic lubrication of point contacts are used to assess the influence of. The book thoroughly addresses all aspects of the topic, from viscosity and rotor-bearing dynamics to elastohydrodynamic lubrication and fluid inertia effects. Fully worked examples, analytical and numerical methods of solutions, practice problems, and detailed illustrations are included in this authoritative reference. This chapter outlines a procedure for the numerical solution of the complete isothermal elastohydrodynamic lubrication problem for rectangular contacts. This procedure calls for the simultaneous solution of the elasticity and Reynolds' equations. In the elasticity analysis, the conjunction is divided into equal rectangular areas.

  Finite Element Modeling of Elastohydrodynamic Lubrication Problems is an ideal book for researchers and graduate students in the field of Tribology. About the Author WASSIM HABCHI, P H D, is an Associate Professor of Mechanical Engineering in the Department of Industrial and Mechanical Engineering at the Lebanese American University, : Wassim Habchi. A numerical solution of time dependent compressible elastohydrodynamic lubrication of line contacts has been obtained. The results show the effects of various operating parameters on the transient response behavior of a lubricated contact. The analysis models a startup situation where the surfaces are initially at rest and in contact. The treatment of elastohydrodynamic lubrication begins with the consideration of elasticity effects in chapters 19 and Elastohydrodynamic lubrication of rectangular conjunctions is considered in chapter 21 and of elliptical conjunctions in chapter Film thicknesses for different fluid film lubrication regimes are presented in chapter element performance -the lubrication mechanism in small, highly stressed conjunctions between the rolling element and the rings or races -is considered in the elastohydrodynamic lubrication section. Conformal and Nonconformal Surfaces Hydrodynamic lubrication is Cited by: