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interface friction

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Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006829
EISBN: 978-1-62708-295-2
... (experimental validation using flat-on-flat interface). EDX, energy-dispersive x-ray. Adapted from Ref 68 , 69 . Reprinted with permission from Elsevier Fig. 19 Evolution of fretting wear rate increase with applied sliding amplitude for an adhesive wear Ti-6Al-4V interface. (a) Basic friction energy...
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
... such as metals. A polymer-polymer sliding pair, except in few instances, usually produces undesirable high friction and high wear conditions due to enhanced adhesion between the polymer. Also, poor conductivity of the polymers results in elevated temperature at the polymer/polymer interface, leading to melting...
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
... of variation in critical stress components with depth for a circular rolling contact of diameter 2 a Values relative to P o indicated in Eq 1 – 3 will be different for elliptical contacts. Also, the location and magnitude of these stresses strongly depend on the value of the friction coefficient...
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
... Simple application Very efficient for stable operating conditions (after running-in, high contact pressure, low oil temperature) Definition of average coefficient of friction required Does not predict gear scuffing during running-in Inefficient at high oil temperatures Does not explain...
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
... of this would be expended in shear at the interface, so α would be small, for example, 10%. The friction coefficient, μ, for an unlubricated contact generally falls in the range 0.5 to 1, it would be expected that K would be about an order of magnitude smaller than the sliding wear coefficient, k...
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
... on rebound measurements of a striking hammer) ( Ref 3 ), and only a small amount of this would be expended in shear at the interface, so α would be small, for example, 10%. The friction coefficient, μ, for an unlubricated contact generally falls in the range of 0.5 to 1, so it would be expected that K...
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
... of the main shaft (journals C, D, and E) to turn after the main shaft fractured at the interface of journals B and C, but it is possible for journal B to keep turning in this time. Hence, severe friction-wear process between the external surfaces of the bearing sleeve and the bearing bush could...
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
... of the snubbers will give rise to increased vibration of the blades and the onset of impact fretting. In some turbines, a wire is threaded through holes in the outer ends of the blades to dampen down vibration. In this case, the frictional energy dissipated in the fretting process is the effective agent and may...
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
... interfaces can be easily detected. Inclusions and other inhomogeneities can also be detected by causing partial reflection or scattering of the ultrasonic waves or by producing some other detectable effect on the ultrasonic waves. The disadvantages of ultrasonic inspection include: Manual operation...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003572
EISBN: 978-1-62708-180-1
... , the crack growth velocity, is related to fiber aspect ratio, elastic modulus of fiber, shear modulus of the matrix, stress of friction on damaged matrix-fiber interface, fiber fraction, and many other complex characteristic properties. If F N is large, thermal effect becomes significant...
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
... abrasion is said to exist when loose particles are trapped between rubbing solids. They become momentarily fixed in the rubbing process to produce scratching but may also roll in the interface to produce material removal by adhesive transfer to the loose particle. Adhesive transfer or adhesive wear almost...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003570
EISBN: 978-1-62708-180-1
...-droplet erosion. Both forms of liquid-impact erosion are discussed in detail in Friction, Lubrication, and Wear Technology , Volume 18 of ASM Handbook ( Ref 1 , 2 ). Most of what is presented in those articles is not repeated here; instead, emphasis in this article is on manifestations of damage...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001822
EISBN: 978-1-62708-180-1
... of specimen etched with 2% nital. 275× Abstract Abstract This article provides a background of friction-bearing failures due to overheating. The failures of locomotive axles caused by overheated traction-motor support bearings are discussed. The article also describes liquid-metal embrittlement (LME...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001788
EISBN: 978-1-62708-241-9
... between billet–container and billet–die interfaces with coefficient of friction equal to 0.1. Material Models The die is considered as an elastic body and the billet is made of aluminum and is modeled as a von Mises elastic-plastic material with isotropic hardening. Predicting stresses and strains...
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
.... Cavitation damage may occur when surfaces in contact with fluid are subjected to vibrations (e.g., water-cooled diesel-engine cylinder liner). Sometimes, cavitation can initiate other types of wear such as adhesion or abrasion because of wear particles produced at the friction interface, making the failure...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003560
EISBN: 978-1-62708-180-1
... of frictional energy dissipation at the interface between the wearing surfaces. Under these circumstances, the wear behavior is influenced by characteristics such as the friction coefficient and thermal conductivity of the two wear bodies. In materials that exhibit low values of thermal conductivity, one of two...
Book Chapter

Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006790
EISBN: 978-1-62708-295-2
..., or Scratching, Abrasion Sliding Abrasion As previously noted, the types of wear are sometimes classified as abrasive and adhesive wear. Adhesive wear is the result of microscopic welding at the interface between two mutually soluble metals. Adhesion is a major contributor to sliding resistance (friction...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003509
EISBN: 978-1-62708-180-1
... electron beam welds electroslag welds fatigue fitness-for-service assessment flash welds friction welding high-frequency induction welds inclusions joint design laser beam welds mechanical testing porosity upset butt welds weld discontinuity weldment failure weldment integrity WELDMENT...
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
... of the bearing halves where they contacted the shaft after the cap shifted. Fig. 10 Sliding bearings damaged by abrasion by foreign particles. (a) Unetched specimen showing a large foreign particle (arrow) at the interface of a bearing and shaft. 110×. (b) Bearing surface scored by metal chips...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.usage.c9001597
EISBN: 978-1-62708-236-5
... reached the bearing interface, spalling and localized seizure caused bearing failure and engine outage. Lubrication conditions appeared nominal as evidenced by bearing, piston, and oil examination. Although much good work was done in this case study, and many good conclusions were drawn, none...