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lubricant rheology

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Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006399
EISBN: 978-1-62708-192-4
...-established and widely accepted analytical methods and design and analysis charts for dealing with some of the issues in the area of engine and power train tribology. It provides a discussion on lubricant rheology and the prediction of lubricating film thickness. The article reviews the frictional power loss...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006423
EISBN: 978-1-62708-192-4
.... An increase in temperature results in a change in lubricant rheology, a decrease in flow stress of surface asperities and subsurface material, and an increase in chemical reactivity between the material being deformed and the lubricant. In the drawing process, hydrodynamic lubrication is promoted...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006403
EISBN: 978-1-62708-192-4
... that involve solid contact (see also the article “Laboratory Testing Methods for Solid Friction” in this Volume). Friction forces under lubricated conditions are mostly lower than those of solid friction and depend on the shear resistance of interfacial boundary films and on the rheology of the lubricant...
Book Chapter

By Rob Bosman
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006381
EISBN: 978-1-62708-192-4
.... , Franco J.M. , and Gallegos C. , Relationship among Microstructure, Rheology and Processing of a Lithium Lubricating Grease , Chem. Eng. Res. Des. , Vol 83 ( No. 9 ), 2005 , p 1085 – 1092 10.1205/cherd.04311 7. Delgado M.A. , Valencia C. , Sánchez M.C. , Franco...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.9781627081924
EISBN: 978-1-62708-192-4
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006370
EISBN: 978-1-62708-192-4
... is the mean velocity, η is the lubricant viscosity, θ is the bite angle, and σ is the material flow strength. γ is called the pressure-viscosity coefficient and appears in the Barus equation for lubricant rheology: (Eq 11) η = η o e γ p where p is the pressure and η o is the viscosity...
Book Chapter

By Justin Heimsch
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005273
EISBN: 978-1-62708-187-0
... had its genesis in Merton Flemings' lab in 1971 with the rheological experiments done by David Spencer as part of his doctoral thesis. The discovery that shearing a semimolten metal produced potentially castable rheologies ignited tremendous interest in what would be an entirely new area of casting...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006393
EISBN: 978-1-62708-192-4
..., surface texture, and lubricant chemistry. Typical values range from 0.1 to 0.2 with hydrocarbon-based oils ( Ref 45 ). The coefficient of friction becomes entirely a function of lubricant rheology when full-film separation prevails ( Ref 46 ). It is common to consider the ratio of the sliding...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006849
EISBN: 978-1-62708-395-9
... properties of polymer. This is followed by a section describing molecular weight determination using viscosity measurements. Next, the article discusses the use of cone and plate and parallel plate geometries in melt rheology. It then reviews the processes involved in the analysis of thermoplastic resins...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004032
EISBN: 978-1-62708-185-6
.... The lubricant contains many surfactants and binders that change the droplet surface energy, rheology, physics, and thermodynamics. The lubricant contains fine particles of graphite (submicron to several microns in diameter) in colloidal suspension. Consequently, the flow is actually multiphase. The composition...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006424
EISBN: 978-1-62708-192-4
... on lubricant rheology. Thus, a highly viscous or semisolid lubricant such as lanolin may give lower friction at low speeds than viscous oil, yet result in higher friction at high speeds where its shear strength is higher than that of an oil film. Effects of Process and Surface Geometry As in all PHD...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006411
EISBN: 978-1-62708-192-4
... 11 Lubricant properties Basic properties Performance properties Bulk modulus Corrosion/rust Surface tension Wettability Thermal conductivity Volatility Electrical conductivity Foaming/air release Heat capacity Toxicity Refractive index Biodegradability Rheology...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006405
EISBN: 978-1-62708-192-4
... Abstract This article focuses on lubricants classified as either internal combustion engine or nonengine lubricants, and the lubricant additives. The functional groups of chemically active and inert additives, as well as friction modifiers and other additives, are described in detail...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003402
EISBN: 978-1-62708-195-5
... assumption used in polymer and composites processing, as compared to the fully developed temperature profile due to low Reynolds number flows. One of the most common situations in which the fully developed flow is used is in conjunction with the lubrication approximation. This allows one to simplify...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006369
EISBN: 978-1-62708-192-4
... coefficients, the latter of which depend on the viscosity and rheology of the liquid metal. Because the friction and wear of these materials are elevated when the surfaces are oxidized, and because soft metals function better as lubricants when they are in the molten state, they excel as solid lubricants...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006422
EISBN: 978-1-62708-192-4
... visible. Effects of Roll Surface Roughness Roll surface roughness can be beneficial or harmful depending on the magnitude of the roughness relative to film thickness, on lubricant rheology, and on the directionality of the roll surface texture. Rolls are usually ground under closely controlled...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006413
EISBN: 978-1-62708-192-4
... near the top piston ring zone. This results in oil having different rheology at the top-ring zone compared with that in the sump. Additive concentrations are also expected to vary. Enrichment factors of metallic compounds of oil sampled from the piston-ring groove are critical for lubrication. Metallic...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006409
EISBN: 978-1-62708-192-4
... Abstract This article provides an overview of experimental, analytical, and numerical tools for temperature evaluation of dry and lubricated systems. It describes the analytical methods and numerical techniques for frictional heating and temperature estimation, as well as viscous heating...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006427
EISBN: 978-1-62708-192-4
... or waviness patterns on the skirt and surface roughness; skirt design details such as ovality and axial profile, and lubricant thickness and rheology. The piston skirt is considered compliant and flexible in response to mechanical loads such as the oil film pressure itself. The mechanical deformations add...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002490
EISBN: 978-1-62708-194-8
... bodies usually can provide the required rheology with minor additives such as dispersants (deflocculants) and through control of clay fractions and particle size distribution. For technical and advanced ceramics that contain no clay fraction organic binders, plasticizers and lubricants are added...