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contact wear

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Published: 01 December 2019
Fig. 2 Examples of contact wear and gouging on one side (see black arrows) of the mating components More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003564
EISBN: 978-1-62708-180-1
... fatigue failure, the delamination failure, and the rolling-contact wear. ceramics delamination failure fatigue cracks propagation rolling contact fatigue test machines rolling-contact fatigue rolling-contact wear spalling fatigue failure surface cracks TECHNICAL CERAMICS used...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048253
EISBN: 978-1-62708-234-1
.... It was found that gear 1 had a lower hardness than specified while the case hardness of gear 2 was found to be within limits. Both the pitting and the wear pattern were revealed to be more severe on gear 1 than on gear 2. Surface-contact fatigue (pitting) of gear 1 (cause of lower carbon content...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001741
EISBN: 978-1-62708-234-1
... was designed to handle soft lignite coals but had been used to crush hard deep-mined anthracite coals. Anthracite Crushers Lignite Loads (forces) Taper roller bearings Carburized steel Rolling-contact wear Metallographic evidence of microstructural features in the shape of ‘butterflies’ ( Fig...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001189
EISBN: 978-1-62708-218-1
... or case hardening would have been better under these circumstances. Fuel injection pumps Gears Pitting (wear) C45 Rolling-contact wear Two fuel injection pump gears that were nitrided in a cyanide bath were submitted by the engine manufacturer for examination of hardness distribution...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047998
EISBN: 978-1-62708-225-9
... environmental conditions and were installed as a corrective measure. Importance of dirt free supply and drainage of oil was discussed. Ball bearings Leakage Lubricants Overheating Shafts (power) Bearing steel Rolling-contact wear Pitting corrosion A large number of drive-shaft hanger bearings...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001680
EISBN: 978-1-62708-221-1
... of Cables, uses a broader definition for wire rope fatigue that includes these interactions.[ 6 ] In mine hoisting, wear is present in three broad categories: 1) Crown wear on the outside of the rope due to motion over a sheave or drum, 2) wear from line contact between wires, and 3) wear from point...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001498
EISBN: 978-1-62708-218-1
... of single-tooth contact. The cause of failure was tooth-tip interference from the mating gear teeth. Because the mating parts within the assembly had not been returned or examined, unanswered questions remained. Axles Interference Mining Motor trucks 43BV12 Rolling-contact wear Fatigue fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047975
EISBN: 978-1-62708-225-9
... by contact fatigue mechanism (flaking) activated by the subsurface nonmetallic inclusions. Aircraft components Bearing races Flaking Transmissions (sutomotive) Bearing steel Fatigue fracture Rolling-contact wear The pilot of an aircraft reported illumination of the transmission oil-pressure...
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
... was continuous high overload that may also have contributed to the bearing displacement. Bearings Bevel gears Differential gears Displacement Lift trucks Mechanical drives 4820H UNS H48200 Fatigue fracture Rolling-contact wear A spiral bevel gear and pinion set that showed “excessive wear...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001248
EISBN: 978-1-62708-221-1
... in the lubricating oil line. Such would cause seizure of the gears and damage. The incidence of such defects stopped after corrective measures were taken. Cracking (fracturing) Spur gears Surface defects Fe-0.20C-1.25Ni-1.0Cr-0.9Mo Rolling-contact wear At one time there were instances of failure...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047968
EISBN: 978-1-62708-225-9
... life Supports Temperature 440C UNS S44004 Fatigue fracture Rolling-contact wear The radial-contact ball bearings supporting a computer microdrum became noisy and were removed for examination. A sample of the lubricant used with the bearings was sent to the laboratory with four sets...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001754
EISBN: 978-1-62708-241-9
... As-received photographs of the primary hardware of interest in the investigation: ( a ) beveled gear, ( b ) sleeve, ( c ) outer race, ( d ) inner race, ( e ) rolling elements, ( f ) generic schematic of assembly Fig. 2 Examples of contact wear and gouging on one side (see black arrows) of the mating...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047964
EISBN: 978-1-62708-223-5
... of the grinding machine was reconditioned to eliminate the undulations and retained austenite was minimized by careful heat treatment. Bevel gears Cracks Gear boxes Magnetic particle testing Spalling Surface grinding 8620 UNS G86200 Rolling-contact wear The service life of a production gearbox...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001500
EISBN: 978-1-62708-221-1
... diagonally across the profile of the loaded side, which was consistent on every tooth. Agricultural equipment Bevel gears Design Loads (forces) Tractors 4820H UNS H48200 Rolling-contact wear Fatigue fracture A spiral bevel gear and pinion set was submitted for examination and evaluation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001191
EISBN: 978-1-62708-225-9
...) spread in steps which finally led to the breaking off of parts from the middle flange and complete failure of the rings. Bearing steel Roller bearings Scouring Stress cracking 100CrMn 6 Fatigue fracture Rolling-contact wear Inner rings of spherical roller bearings out of the full...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001092
EISBN: 978-1-62708-214-3
... was 35 to 38 HRC. These hardness levels were within specification. Hardness in the case below the burnished and spalled areas was the same as in the undamaged zones. Contact stresses Transmissions (automotive) 4320H UNS H43200 Rolling-contact wear Fatigue fracture Handbook of Case Histories...
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
... alternating stress field within the rolling-contact bodies, which eventually leads to material removal. The mechanism of RCF thus differs from the delamination theory of wear ( Ref 1 , 2 ), which also relies on cyclic loading but in sliding conditions and at asperity level. The alternating stress field...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001231
EISBN: 978-1-62708-232-7
... bottom was machined only roughly. Also, the yield point was a little bit too low. Forgings Gears Pitting (wear) Rolling mills Fe-0.4C-0.8Si-1.1Mn Rolling-contact wear Fatigue fracture The rim of a gear wheel of 420 mm width and 3100 mm in diameter broke after four years of operation time...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001831
EISBN: 978-1-62708-241-9
... direct reading spectrometer. SEM/EDS was used to examine the local morphology and composition of fracture and contact surfaces. Chemical and thermal properties of the bearing grease were also examined. The investigation revealed that the failure was caused by wear due to dry friction and impact, both...