Minimum film thickness in elliptical contacts for different regimes of fluid-film lubrication
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Minimum film thickness in elliptical contacts for different regimes of fluid-film lubrication by Bernard J Hamrock

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

Subjects:

  • Fluid-film bearings,
  • Lubrication and lubricants

Book details:

Edition Notes

StatementBernard J. Hamrock and Duncan Dowson, Lewis Research Center
SeriesNASA technical paper ; 1342
ContributionsDowson, D., joint author, Lewis Research Center, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office
The Physical Object
Pagination22 p. :
Number of Pages22
ID Numbers
Open LibraryOL14932233M

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FILM THICKNESS FOR DIFFERENT REGIMES OF FLUID-FILM LUBRICATION Bernard J. Hamrock National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio b There are a number of reasonably well-defined regimes within the full range of conditions of fluid-film lubrication of elliptical contacts. EachFile Size: KB. film thickness is defined for the four fluid-film lubrication regimes just described for conjunctions ranging from circular to rectangular. The film thickness equations for the respective lubrication regimes come from theoretical studies reported in previous chapters on elastohydrodynamic and hydrodynamic lubri-cation of elliptical Size: 2MB. The predicted minimum film thickness is compared in Table for different bearings, with the corresponding lubrication regimes. The importance of the fluid-film lubrication contribution to the overall tribological performance of metal-on-metal bearings has been recognised under well-lubricated conditions.   Chapter Twenty of Fundamentals of Fluid Film Lubrication by Bernard J. Hamrock, Steven R. Schmid, and Bo O. Jacobson is entitled Film Thickness for Different Regimes of Fluid Film Lubrication. This chapter covers film thickness in non-conformal contacts. There are two variables which each have two settings that determine the lubrication state.

Hamrock, B.J. and Dowson, D. (b) “Minimum Film Thickness in Elliptical Contacts for Different Regimes of Fluid Film Lubrication” Proceedings of 5th Leeds-Lyon Symposium. Google Scholar Hamrock, B.J., Jacobson, B., and : Bernard J. Hamrock. Fundamentals of Fluid Film Lubrication book by the authors Bernard J. Hamrock, Steven R. Schmid Specifically focuses on fluid film, hydrodynamic, and elastohydrodynamic lubrication, this book studies the most important principles of fluid film lubrication for the correct design of bearings, gears and rolling operations and the prevention of. In mixed and fluid film lubrication regimes, the pressure and coefficient increase for larger dents. Furthermore, as the dent increases and the Sommerfeld number decreases, the flow rate. Other articles where Fluid-film lubrication is discussed: lubrication: Fluid-film lubrication.: Interposing a fluid film that completely separates sliding surfaces results in this type of lubrication. The fluid may be introduced intentionally, as the oil in the main bearings of an automobile, or unintentionally, as in the case of water between a smooth rubber.

Fluid bearings are noncontact bearings that use a thin layer of rapidly moving pressurized liquid or gas fluid between the moving bearing faces, typically sealed around or under the rotating shaft. The moving parts do not come into contact, so there is no sliding friction; the load force is supported solely by the pressure of the moving are two principal ways of getting . With regard to lubricant film thickness between surfaces in relative motion, four regimes can be recognized: hydrodynamic, boundary, mixed, and elastohydrodynamic. The parameter usually used for characterizing these regimes is the ratio of the minimal film thickness h to the asperity height R a.A commonly accepted illustration of the regimes is the Stribeck curve (Fig. ) . Hamrock, B. J., and Dowson, D., , “Minimum Film Thickness in Elliptical Contacts for Different Regimes of Fluid Film Lubrication,” Proceedings of the 5th Leeds-Lyon Symposium on Tribology, pp. 22–Cited by: Hydrodynamic Lubrication of Nonconformal Surfaces. Simplified Solutions for Stresses and Deformations. Elastohydrodynamic Lubrication of Rectangular Conjunctions. Elastohydrodynamic Lubrication of Elliptical Conjunctions. Film Thickness for Different Regimes of Fluid Film Lubrication. Rolling Element Bearings. Additional Lubrication Applications.