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
|Statement||Steven M. Sidik and John J. Coy.|
|Series||NASA technical paper ; 1130, NASA technical paper -- 1130.|
|Contributions||Coy, John J., United States. National Aeronautics and Space Administration. Scientific and Technical Information Office.|
|The Physical Object|
|Pagination||39 p. :|
|Number of Pages||39|
A simple theory of asperity contact in elastohydro-dynamic lubrication Article (PDF Available) in Wear 19(1) January with 2, Reads How we measure 'reads'. A statistical model of elasto-plastic asperity contact between rough surfaces Article in Tribology International 39(9) September with Reads How we measure 'reads'. Lubrication and lubricants: A treatise on the theory and practice of lubrication, Statistical model for asperity contact time fraction in elasthydrodynamic lubrication / Microasperity model for elastohydrodynamic lubrication of a spinning ball on a flat surface [electronic resource] /. 5=2 Statistical function for asperity load carrying capacity F 2 Statistical function for asperity contact area h Separation or ﬁlm thickness h 0 Initial gap between surfaces h ini Height of the highest peak relative to the mean centre-line of the surface m Mass of ﬂoating plate L Length of sliding strip p Hydrodynamic pressure p atm Cited by:
Using an asperity based model including five families of asperities (2 for full fluid lubrication and 3 for local boundary lubrication), we simulate mixed lubricated behavior. Our theoretical results confirm the relation between the mixed regime and the by: 1. the pressure and film deformation become time-dependent as the asperity enters the contact region. To determine the change in pressure and de-formation caused by the asperity, it is required to solve the coupled elastohydrodynamic equation at successive time intervals taking into account the effect of the squeeze film term. For each time interval,Cited by: 7. 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  or gases. Elasto-hydrodynamic lubrication. D. Dowson, G. R. Higginson. Archard Battelle Memorial Institute calculated capacitance cavitated Chapter coefficient of friction constant viscosity contact zone Crook deformation dielectric constant dimensionless disk machine displacement dry contact effect elastic elastic modulus elasto All Book Search.
This review of elastohydrodynamic lubrication (EHL) was derived from many excellent sources (Refs. 1–5). The review of Blok’s flash temperature theory was derived from his publications (Refs. 6–9). An excellent general reference on all aspects of tribology is the Encyclopedia of Tribology (Ref. 10). usually referred to elastohydrodynamic lubrication (EHL) regimes. At the same time, in the zones close to contact boundaries the contribution of the lubricant flow and contact solid elasticity are comparable [Kudish and Covitch, ]. The conditions when the lubrication film thickness is comparable to the height of surface asperities are usuallyFile Size: KB. 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 deform during the hydrodynamic Size: 7KB. asperity lubrication through use of the statistical distribution for height and radius. Mechanical behaviour of asperity Each asperity can act through several way and as an example, let us consider a particular situation of the contact of a rough deformable surface on a smooth rigid one (Figure 2). The general case of two rough surfaces.