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fluid-film lubrication

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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
... Abstract This article discusses the classification of sliding bearings and describes the major groups of soft metal bearing materials: babbitts, copper-lead bearing alloys, bronze, and aluminum alloys. It provides a discussion on the methods for fluid-film lubrication in bearings. The article...
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...
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...
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 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 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.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
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006850
EISBN: 978-1-62708-395-9
... of a polyetheretherketone (PEEK)-matrix composite with 20% (by volume) PTFE particulates showed that solid-state lubricant PTFE particulates in the PEEK matrix decreased the PTFE/PEEK composite friction coefficient and wear rate appreciably by continuous formation of PTFE transfer films over the contact surface between...
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: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
... severe when the lubrication condition is the mixed elastohydrodynamic (EHD) type, where the fluid film vanishes locally and instantaneous asperity contacts take place. The sliding action between the mating surfaces generates frictional heat that increases the surface bulk temperature when the heat cannot...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001575
EISBN: 978-1-62708-217-4
... by overheating. It is very important to highlight that engine syntetic lubricating fluid looses properties and begins to release carbon deposits in the range of 230 ÷ 250°C. Neither carboned deposits nor burnt oil film were detected during visual examination of the frozen components. On the other hand...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001846
EISBN: 978-1-62708-241-9
... the fatigue cracks to initiate. However, the initiating process was the loss of lubricant in the system. Therefore, it is recommended that careful attention be given to lubrication and the condition of the grease and other lubricating fluids be monitored when feasible. References References 1. Steel...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006869
EISBN: 978-1-62708-395-9
... external lubrication fluids because polymers are self-lubricating. The tribological performance of RPs can be improved by adding reinforcement such as particles, fibers, or a mix of both. The distribution of fillers in terms of shape, size, type, volume fraction, and fiber orientation relative...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006794
EISBN: 978-1-62708-295-2
... of Fluid Machinery , Metall. Mater. Trans. A , Vol 48 , 2017 , p 2193 – 2206 10.1007/s11661-017-4004-2 7. Szala M. , Walczak M. , Pasierbiewicz K. , and Kamiński M. , Cavitation Erosion and Wear Mechanisms of AlTiN and TiAlN Films Deposited on Stainless Steel Substrate...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003569
EISBN: 978-1-62708-180-1
... propellers, valves, heat-exchanger tubes, and other hydraulic structures in contact with high-velocity liquids subjected to pressure changes. This type of wear also has been observed in mechanical devices such as plain bearings, seals, and orifices in which fluid goes through severe restrictions. Cavitation...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006796
EISBN: 978-1-62708-295-2
... of LDI erosion under the influence of a liquid film and surface roughness and on the prediction of LDI erosion. The fundamentals of LDI and processes involved in initiation of erosion are also discussed. empirical erosion model liquid droplet impingement erosion liquid film prediction model...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003562
EISBN: 978-1-62708-180-1
...,” “cocoa,” or “red mud.” In components that are lubricated so that ordinary corrosion is not likely to occur, the presence of reddish brown debris is indicative of fretting. If a component is not lubricated, the presence of oxide powder may not necessarily signify fretting but, rather, wear. Fretting also...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006782
EISBN: 978-1-62708-295-2
... and stereo- and 3D digital microscopy examinations are completed, scanning electron microscopy (SEM) examination may be needed. Samples must be cleaned of any lubricant or fluid. Sometimes, samples with dried scale/deposit can be analyzed initially, followed by cleaning and reexamination. The SEM examination...
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
.... Polymers are viscoelastic, that is, they respond to stress as if they were a combination of elastic solids and viscous fluids, but not always in a stable 50–50 proportion. The balance of the storage and loss components of a polymer is important in determining its melt processibility and functionality...