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hydrodynamic lubrication

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Published: 31 December 2017
Fig. 15 Method of inducing hydrodynamic lubrication with a solid lubricant in wire drawing. Adapted from Ref 33 More
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Published: 31 December 2017
Fig. 18 Schematic of conceptual hydrodynamic lubrication regime in wire drawing More
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Published: 31 December 2017
Fig. 21 Die set for hydrodynamic lubrication using viscous fluids. Source: Ref 1 More
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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: 01 December 1998
Fig. 32 Step-by-step development of a hydrodynamic lubricating film in a unidirectionally loaded journal bearing More
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...
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Published: 31 December 2017
Fig. 24 Die designs to passively pressurize (a) soap lubricants and (b) liquid lubricants to encourage hydrodynamic lubrication. The difference in the length of the inlet geometry is due to the fact that the viscosity of liquid lubricants is generally much lower than that of solid lubricants More
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Published: 31 December 2017
Fig. 9 Appearance of deformed surfaces in rolling of aluminum under different lubrication regimes: (a) work roll surface finish reproduced under boundary lubrication, (b) smearing due to lubricant breakdown, (c) surface roughening under hydrodynamic lubrication. Source: Ref 16 More
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Published: 30 August 2021
Fig. 4 Schematic of the transition from (a) inadequate (boundary) lubrication at startup to (b) hydrodynamic lubrication at full speed, h is minimum separation More
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Published: 31 December 2017
Fig. 2 The Stribeck curve, showing how the coefficient of friction varies with a lubricity parameter including lubricant viscosity (η) interface speed ( V ), and die pressure ( P ) through boundary, mixed, and hydrodynamic lubrication conditions. Adapted from Ref 32 More
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Published: 01 January 2002
Fig. 1 Schematic of the transition from inadequate (boundary) lubrication at start-up to hydrodynamic lubrication at full speed. (a) Steady load at start-up. (b) Steady load at full speed More
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Published: 31 December 2017
generation is induced by the asperity-contacts, whereas the remaining fraction is determined by the heat generated due to viscous friction within the lubricant film. Depending on the lubricant regime, i.e., boundary, mixed, or full hydrodynamic lubrication, the contribution of both parts will vary. More
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Published: 31 December 2017
Fig. 25 Hydrostatic drawing die with actively pressurized inlet zone to encourage hydrodynamic lubrication. Source: Ref 63 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: 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.a0006365
EISBN: 978-1-62708-192-4
... of a lubrication film ( Ref 7 ). Under full-film lubrication, where one finds the most successful implementation of surface texturing (i.e., sliding bearings, face seals, piston rings, hard drives), the individual dimples also act as hydrodynamic pressure pockets, which increase the load-bearing capacity ( Ref 8...
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
... lubrication, which is a common method to separate the bearing surfaces (configuration IV in Fig. 1 ). In conformal bearings, surfaces are usually separated by a thick oil or gas film generated hydrodynamically/aerodynamically by the surface velocities or hydrostatically by an externally pressurized lubricant...
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
.... Methods of friction and wear control depend on the component. For example, metal rubbing is dominant in the valvetrain system, whereas hydrodynamic lubrication is the norm in the crankshaft and camshaft bearings. Due to the higher metal-to-metal contacts in the valvetrain system, wear is more sensitive...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001809
EISBN: 978-1-62708-180-1
... and presents the steps for failure analysis of sliding bearings. It also reviews the factors responsible for bearing failure with examples. aluminum alloys babbitts bronze contaminants copper-lead bearing alloys elasto-hydrodynamics failure analysis fluid-film lubrication grooves load-carrying...
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...