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greases

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Published: 01 December 2019
Fig. 6 SEM morphologies of the greases: ( a ) fresh and ( b ) used More
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Published: 01 December 2019
Fig. 7 FTIR results of the greases: ( a ) fresh and ( b ) used More
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Published: 01 December 2019
Fig. 8 RS results of the greases: ( a ) fresh and ( b ) used More
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Published: 01 December 2019
Fig. 9 TGA results of the greases: ( a ) fresh and ( b ) used More
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Published: 01 December 2019
Fig. 10 XRD results of the greases: ( a ) fresh and ( b ) used More
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Published: 30 August 2021
Fig. 47 Grease condition during bearing disassembly with water ingress. Free water was noted, and milky grease is present along the rolling-contact surfaces More
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
...-type mineral-oil lubricant (containing molybdenum disulfide and polytetrafluoroethylene particles) or grease conforming to MIL-G-81322 (containing thickening agent and synthetic hydrocarbons) and had two-piece spot-welded retainers. On visual examination, the balls were observed to be embedded...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090448
EISBN: 978-1-62708-222-8
... the testing regimen. Grease was applied liberally within the housing assembly during production. Investigation included visual inspection, 24x SEM images, micro-FTIR in the ATR mode, and analysis using DSC. No signs of material contamination were found, but the thermograms showed a crystallization of the PET...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047935
EISBN: 978-1-62708-225-9
... was suspected to have caused the electric discharge by accumulation and discharge of static charge. The electrical resistance between the rotor and the motor frame lubricated with electrically conductive grease and the grease used in the current case was measured and compared to confirm the fact the currently...
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
... and was packed with molybdenum disulfide (MoS 2 ) lithium grease. Metallurgical structures and chemical compositions of the bearing’s matrix materials were inspected using a microscope and photoelectric direct reading spectrometer. SEM/EDS was used to examine the local morphology and composition of fracture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047125
EISBN: 978-1-62708-217-4
... Abstract A commercial aircraft wheel half, machined from an aluminum alloy 2014 forging that had been heat treated to the T6 temper, was removed from service because a crack was discovered in the area of the grease-dam radius during a routine inspection. Neither the total number of landings nor...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001382
EISBN: 978-1-62708-215-0
... Abstract A trunnion bolt that was part of a coupling in a metropolitan railway system failed in service, causing cars to separate. The bolt had been in service for more than ten years prior to failure. Visual examination showed that the failure resulted from complete fracture at the grease port...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0048150
EISBN: 978-1-62708-235-8
... Abstract Grease-wiper springs for cams formed from stampings of 0.25-mm thick carbon spring steel (0.65 to 0.80% C) fractured at the 0.025 mm radius on the stamped 135 deg corner at a 90 deg bend after 5,000,000 cycles. Tool marks 2 to 2.3 mm from the center of the stamped bend were disclosed...
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
... was installed in contact with the inner ring for accurate positioning of the microdrum. The particles contained in residue achieved after cleaning of the grease on bearings with a petroleum solvent were attracted by a magnet and detected under a SEM (SEM) to be flaked off particles from the outer raceway...
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Published: 01 December 1993
Fig. 2 One of the mating fracture surfaces. Fracture propagated from the two small zones of fatigue around the grease port hole. The dark zone at the bottom of the fracture surface is merely a shadow resulting from curvature of the surface. Note the old grease in the grease port. More
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Published: 01 January 2002
Fig. 4 Failed nose landing gear socket assembly due to LMIE. (a) Overall view of the air-melted 4330 steel landing gear axle socket. Arrow A indicates the fractured lug; arrow B, the bent but unfailed lug. Arrow C indicates the annealed A-286 steel interference-fit plug containing the grease More
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Published: 15 January 2021
interference-fit plug containing the grease fitting that was removed from the fractured lug. (b) The segment of the fractured lug (A) that remained attached to the launch bar. (c) The forward section of the lug shown in (b) after removal from the launch bar. Arrow A indicates the primary fracture side; arrow B More
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Published: 15 January 2021
Fig. 41 Comparison of the stabilized friction coefficient (5000 cycles test duration) of a cylinder-on-flat smooth surface as a function of the applied measured displacement amplitude between a dry and a grease-lubricated contact. Adapted from Ref 160 More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001727
EISBN: 978-1-62708-225-9
.... The formation of rust spots could be prevented by covering bolts with a suspension of graphite in grease (Lox-Safe). It became apparent that the presence of aluminum accelerated the stress-corrosion cracking of the stainless. Aluminum is anodic to stainless in the galvanic series — it can be used...
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Published: 01 January 2002
Fig. 6 Weld spots on contact surfaces of a type 440C stainless steel ball bearing. The spots are caused by static electrical discharges resulting from use of an electrically nonconductive grease. (a) and (b) Photographs of inner-raceway surface. 10 and 100×, respectively. (c) and (d) SEM More