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scuffing

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Published: 15 January 2021
Fig. 6 Closeup of scuffing wear failure. (a) Roughening of the surface. Reprinted from Ref 37 with permission from Elsevier. (b) Material transfer. Source: Ref 38 More
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Published: 15 January 2021
Fig. 23 Schematic of FZG back-to-back gear scuffing test setup. Source: Ref 135 More
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Published: 15 January 2021
Fig. 24 Evolution of tooth-surface damage during a scuffing test. Reprinted from Ref 138 with permission from Elsevier More
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Published: 30 August 2021
Fig. 23 Scuffing that occurred on startup of a case-hardened (59 HRC) gear 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
... additives with ISO 100 viscosity. After about 250 h of operation, two gearboxes failed by bending fatigue. Investigation showed the primary failure mode was scuffing, and the earlier bending fatigue failures were caused by dynamic loads generated by the worn gear teeth. Testing of a prototype gearbox showed...
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
... modes of adhesive wear including scoring, scuffing, seizure, and galling, and describes the processes involved in classic laboratory-type and standardized tests for the evaluation of adhesive wear. It includes information on standardized galling tests, twist compression, slider-on-flat-surface, load...
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Published: 01 June 2019
Fig. 2 Plot of contact temperature versus pinion roll angle for gear tooth geometry of scuffed gearset. Maximum T f , 226 °C (439 °F); scuffing probability, 63% More
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Published: 01 June 2019
Fig. 4 Plot of contact temperature versus pinion roll angle for gear tooth geometry that was optimized for maximum scuffing resistance. Maximum T f, 150 °C (302 °F); scuffing probability, <5% More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001482
EISBN: 978-1-62708-229-7
.... Subsequently, it was ascertained that trouble had been experienced with the centrifugal feed pumps, resulting in scuffing of some bronze rings. The presumption is that bronze particles had been carried in mechanical suspension in the feed water and deposited in the economizer tubes. Boiler tubes Copper...
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
... lubrication, the measurement of the backlash, and the necessary factors for starting the failure analysis. Next, the article explains various gear failure causes, including wear, scuffing, Hertzian fatigue, cracking, fracture, and bending fatigue, and finally presents examples of gear and reducer failure...
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Published: 01 June 2019
Fig. 3 Plot of film thickness versus pinion roll angle for gear tooth geometry that was optimized for maximum scuffing resistance. λ min , 0.097; probability of wear, 94% More
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Published: 01 June 2019
Fig. 1 Plot of film thickness versus pinion roll angle for gear tooth geometry of a scuffed gearset. Minimum specific film thickness, A min , 0.073; probability of wear, >95% More
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Published: 01 June 2019
Fig. 1 52100 steel jet-engine ball bearing that failed because of overheating resulting from misalignment. (a) Photograph of bearing components showing fractured cage. (b) Enlarged view of cage showing damage caused by scoring, scuffing, and plastic deformation around ball pockets More
Image
Published: 01 January 2002
Fig. 28 52100 steel jet-engine ball bearing that failed because of overheating resulting from misalignment. (a) Photograph of bearing components showing fractured cage. (b) Enlarged view of cage showing damage caused by scoring, scuffing, and plastic deformation around ball pockets More
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Published: 30 August 2021
Fig. 67 An AISI 52100 (100Cr6 or WN 1.3505) steel jet-engine ball bearing failed due to overheating that resulted from misalignment. (a) Bearing components showing fractured cage. (b) Enlarged view of the cage showing damage (scoring, scuffing, plastic deformation of the ball pockets More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047986
EISBN: 978-1-62708-217-4
..., and misalignment. Figure 1(a) shows a photograph of the bearing with the fractured cage. Damage caused by severe scoring, scuffing and plastic deformation of the material surrounding the ball pockets of the cage is shown in Fig. 1(b) . The cage was also cracked between pockets at several locations around...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001501
EISBN: 978-1-62708-221-1
... the top of the tooth, changing the mode from pitting to spalling ( Fig. 1 ). Both photographs show evidence of a double contact: the original setting, and a secondary pattern with the pinion moved out and away from the center of the gear. The convex (reverse) sides are slightly worn and scuffed high over...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001503
EISBN: 978-1-62708-234-1
... uniform contact area that is scuffed the full length of the pattern. The entire pinion head is black due to a heavy coating of iron-manganese-phosphate. Physical Examination Magnetic-Particle Inspection Magnetic-particle inspection revealed no indication of cracking. Surface Hardness Testing...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001815
EISBN: 978-1-62708-180-1
..., breakdown of the oil film will occur when the gear-tooth surface-equilibrium temperature has reached a specific value. Fifth, the scuffing load limit of mating tooth surfaces is speed dependent. With increasing speed, the load required to be supported by the reaction film decreases while the load that can...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001543
EISBN: 978-1-62708-218-1
.... The composites also maintain strengths close to the melting point of aluminum, and would not be subject to overaging. A 35–50 vol. % fiber composite would also have a considerably lower thermal expansion than aluminum. Service Is Rough Pistons in racing cars must operate without scuffing in cylinders up...