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elastohydrodynamic lubrication

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Published: 30 August 2021
Fig. 69 Elastohydrodynamic lubrication and the influence of film thickness on the damaging mechanism of the contact areas. Source: Ref 50 More
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006401
EISBN: 978-1-62708-192-4
.... The article details the classifications of lubrication regimes, namely, boundary, mixed, hydrodynamic, and elastohydrodynamic lubrications. It discusses the various types of lubricant materials and additives, including liquid lubricants, solid lubricants, gaseous lubricants, greases, green lubricants...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006426
EISBN: 978-1-62708-192-4
... bearings. It provides information on the bearing component materials. The article describes the lubrication requirements and lubrication methods, namely, elastohydrodynamic lubrication and grease lubrication. It reviews the adjustment factors influencing fatigue life of the bearing. The article also...
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Published: 31 December 2017
Fig. 31 Localized geometric difference between hydrodynamic lubrication and elastohydrodynamic lubrication mechanisms. (a) Geometric gap in hydrodynamic lubrication. (b) Geometric gap in elastohydrodynamic lubrication More
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Published: 31 December 2017
Fig. 17 Gear life as a function of specific film thickness (λ) in the boundary lubrication (BL) regime, the mixed lubrication (ML) regime, and in the elastohydrodynamic lubrication (EHL) regime More
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Published: 30 August 2021
Fig. 5 Relationship of coefficient of friction to Sommerfeld number, η N / p . EHL, elastohydrodynamic lubrication More
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Published: 31 December 2017
Fig. 7 Film thickness effects on friction and wear rate. EHL, elastohydrodynamic lubrication. Adapted from Ref 35 and 36 More
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Published: 31 December 2017
Fig. 30 Main geometrical and kinetic parameters of a nonconformal contact situation with elastohydrodynamic lubrication and two bodies of radius r I and r II in rolling contact with each other More
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Published: 31 December 2017
at 5000 rpm using modified four-ball machine with Exxon Turbo 2389 as test lubricant in mixed elastohydrodynamic lubrication regime. Adapted from Ref 16 , 19 More
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006806
EISBN: 978-1-62708-329-4
... provides an overview of bearing materials, and then presents the various lubrication mechanisms: hydrostatic, hydrodynamic, boundary lubrication, elastohydrodynamic, and squeeze-film lubrication. The article describes the effect of debris and contaminant particles in bearings. The steps involved in failure...
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
... hydrodynamic lubrication, elastohydrodynamic lubrication (EHL), mixed lubrication, and boundary lubrication. In full hydrodynamic lubrication both surfaces are completely separated by a relatively thick lubricant film (1 to 100 μm, or 39 to 3940 μin.), and friction and frictional heating is entirely dominated...
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
... , the inlet is labeled “lubricant entrance.” The pressure rise within the fluid may be sufficient to generate a load-carrying film between the adjacent solids (see the article “Properties of Liquid Lubricants” in this Volume for more details on lubricant properties). The elastohydrodynamic theory ( Ref 24...
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 is relevant in lubricated tribosystems involving the formation of an elastohydrodynamic film; and the slide-to-roll ratios when motion involves a combination of sliding and rolling motion. Temperature ( T ) of the structural components at a stated location and time. In addition to the operating (steady...
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
... regimes of lubrication. The two main forms are hydrodynamics and elastohydrodynamics. The former refers to the formation of a coherent lubricant film between the contacting surfaces without any localized contact deformation. This occurs at low-to-medium applied loads, with pressures not exceeding several...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002376
EISBN: 978-1-62708-193-1
... surfaces. The film thickness (EHL) divided by composite roughness is termed λ. References 6 and 38 are examples of elastohydrodynamic lubrication (EHL) film calculations for line contact and point contact conditions. Lubricant properties (absolute viscosity and pressure coefficient of viscosity...
Book Chapter

Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006358
EISBN: 978-1-62708-192-4
.... The form and finish are adequate. The lubricant and lubrication system are adequate. The system is adequately protected from rust and contaminants. Pitting fatigue life versus contact stress and elastohydrodynamic lubrication conditions is considered. However, determination of the size...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.9781627081931
EISBN: 978-1-62708-193-1
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0005723
EISBN: 978-1-62708-193-1
... E elastic (Young's) modulus 'ta amplitude of resolved shear stress Em, Emech mechanical strain rate EHL elastohydrodynamic lubrication Emax maximum strain 't5 shear stress amplitude in saturation Emin minimum strain 'tf flow shear stress EMF electromagnetic field Ep plastic strain Epl plastic strain...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006354
EISBN: 978-1-62708-192-4
... gearboxes surface roughness elastohydrodynamic lubrication BECAUSE GEARS are common machine components, they can be taken for granted. It is not generally appreciated that they are complex systems, and successful design requires knowledge from all engineering disciplines. Gear design is a process...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006398
EISBN: 978-1-62708-192-4
..., and the practical aspects and solutions in the friction, lubrication, and wear mitigation of sliding bearings. The lubrication of bearings includes thick-film lubrication, thin-film lubrication, and boundary lubrication. The article concludes with a discussion on the effects of material elasticity...