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thick-film 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 Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0009190
EISBN: 978-1-62708-225-9
... than the measured oil sump temperature. The following data for the ISO VG 100 lubricant was obtained from Fig. and : μ 0 = 66 cP = 0.96 × 10 -6 reyns and α = 1.02 × 10 -4 in. 2 /lbf. Figure 1 shows a plot of the film thickness versus position on the pinion tooth. The minimum film thickness...
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
... lubricant is pumped into them at the pressure prevailing at their location in the bearing. In a hydrodynamic bearing carrying a steady load, the grooves should be located in the half of the beating behind the location of the minimum fluid-film thickness. Grooves may be circumferential, axial, or spiral...
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
... in the bearing. In a hydrodynamic bearing carrying a steady load, the grooves should be located in the half of the bearing behind the location of the minimum fluid-film thickness. As shown in Fig. 3 , the grooves may be circumferential, axial, or spiral in orientation. If they are supplied with lubricant from...
Image
Published: 15 May 2022
Fig. 4 The Stribeck curve demonstrates how sliding interfaces with added liquid lubricant transition through the major lubrication regimes. As the fluid film thickness ratio increases, asperity contact and friction coefficient initially decrease until viscous forces begin to dominate over More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001628
EISBN: 978-1-62708-234-1
... of this technique, very careful preservation of the sample is a necessity, and the analyses need to be performed under very high vacuum conditions, which take several hours to obtain. These analyses revealed that the oil was present over the surface with an approximate film thickness of 100 Å, and an oxide layer...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006911
EISBN: 978-1-62708-395-9
... and wear. When fluid lubricants are used at the sliding interface, the surfaces can slide on a fluid film and reduce asperity-asperity contact. As the fluid film thickness becomes larger than the surface roughness, the surfaces are only sliding on the fluid and have no asperity contact. The transition...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
... ). Generally, these conditions occur in inadequately lubricated contacts ( Ref 40 ) in which an insufficient lubrication-film thickness permits metal-to-metal contact between the contacting surfaces. Without lubrication, a direct-metal contact removes the protective oxide layer from the surface...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003524
EISBN: 978-1-62708-180-1
... mechanics fracture modes fracture surface lubricants macroscopic examination mechanical testing microscopic examination nondestructive inspection sampling simulated-service testing stress analysis wear failure ANALYZING the inevitable failures that occur during testing, manufacturing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003563
EISBN: 978-1-62708-180-1
... the lubrication regime is either boundary or mixed). However, the full film lubrication generally seen in rolling-element bearings should prevent such damage, except at the start/stop of rolling motion. Similarly, plastic flow and bulk failure depend on the bulk thermal and mechanical properties of the bearing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003571
EISBN: 978-1-62708-180-1
... in contact with ( Ref 40 ). In an effort to increase the life of seals, a number of studies have been carried out to estimate the film thickness of the lubricant for elastomer pressed against a metal ( Ref 41 , 42 , 43 ). The other example of the use of polymers in a lubricating environment...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
... of material from the surface of a bearing race depends on the lubricant viscosity and/or film thickness. Various theories have been proposed that attribute the spalling to hydrostatic pressure of the lubricant being forced into surface cracks to propagate them. Another theory states that the propagation...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006834
EISBN: 978-1-62708-329-4
... of Rolling-Element Bearings” in Friction, Lubrication, and Wear Technology , Volume 18 of ASM Handbook , 2017, which specifically covers the question of the lubrication function itself (elastohydrodynamic lubrication and the estimation of the minimum film thickness required to lubricate the contact...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006820
EISBN: 978-1-62708-329-4
... cracks. The layer of oxidized oil indicates the failure began long ago. A close-up view of another section of the worm shows the relatively fine macropitting that occurred where the lubricant film was not adequate ( Fig. 20 ). The layer of oxidized oil on the worm raised suspicions about...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006850
EISBN: 978-1-62708-395-9
... to increase the life of seals, a number of studies have been carried out to estimate the film thickness of the lubricant for elastomer pressed against a metal ( Ref 41 – 43 ). The other example of the use of polymers in a lubricating environment is that of the knee/hip joint replacement using UHMWPE ( Ref 44...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001516
EISBN: 978-1-62708-234-1
... magnetic coating is then sputtered by physical vapor deposition process or electrolytically or electroless deposited. In order to protect this magnetic film, which stores the data, a thin carbon film is sputtered. The carbon film acts both as a protective film and lubricant. The carbon overcoat, in its...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003565
EISBN: 978-1-62708-180-1
... in both normal and compound impact contacts. Wear rates are low as the contacting surfaces are separated by oxide films, which tend to have better lubricating properties than bare metal surfaces. Wear debris is generally fine and predominantly made up of metal oxide. Oxidative wear is particularly...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001646
EISBN: 978-1-62708-219-8
... reduction in deformation. Inadequate lubrication or breakdown of the lubrication film during wire drawing results in greater friction due to metal-to-metal contact between the steel wire and the tungsten carbide die. This may lead to local heating of the wire surface and its abrupt cooling...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006789
EISBN: 978-1-62708-295-2
... by: (Eq 5) Λ = h min R q 1 2 + R q 2 2 where h min is the minimum lubricant thickness between the mating surfaces, and R q1 and R q2 are their root-mean-square roughness values. When Λ is high, typically greater than 3, fluid-film lubrication is present...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006793
EISBN: 978-1-62708-295-2
... and can be found in both normal and compound-impact contacts. Wear rates are low because the contacting surfaces are separated by oxide films, which tend to have better lubricating properties than bare metal surfaces. Wear debris is generally fine and predominantly made up of metal oxide. Oxidative wear...