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grease degradation

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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 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 of which worsened as a result of high-temperature degradation of the bearing grease. Fatigue cracks initiated...
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
... had been degraded, producing a reduction in the molecular weight and reducing both the mechanical integrity and chemical-resistance properties of the parts. Crystallization Electrical appliances Grease Housings Injection molding Molding resins Undercrystallization Polycarbonate...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001527
EISBN: 978-1-62708-224-2
..., or a comparable surface science methodology. In questions concerning the presence or absence of lubricant, or if the identification of a wire rope lubricant is needed, infrared spectrometry may provide answers. The fiber core could also be analyzed for evidence of overheating, grease degradation, and organic...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003525
EISBN: 978-1-62708-180-1
..., including catastrophic mechanisms, such as brittle fracture, ductile overload, creep rupture, environmental stress cracking, molecular degradation, and fatigue. In the case of failure involving fracture, the determination of the failure mode involves identifying how the crack initiated and how...
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
... (suffix “HRS,” grease-retention action), contacting rubber lips (suffix “RS”), and multiple contacting rubber lips (suffix “ELS”). Note the complexity of the sealing geometry while improving its overall performance. Source: Ref 2 The five main properties to consider when determining...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006909
EISBN: 978-1-62708-395-9
... product formation on the apparatus surface. All moving parts should be coated in molybdenum grease to prevent stiction. Moisture Conditioning The degree of degradation that occurs in polymeric systems, particularly FRPs, when in service can often be linked directly with the amount of moisture...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001385
EISBN: 978-1-62708-215-0
..., the connection becomes so loose that there is no longer true electrical contact and series arcs are drawn, leading to rapid deterioration of the wiring and terminal. This sequence of events occurred in incident 3. Heat buildup in the electrical connection also degrades the insulation on the aluminum wires...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003554
EISBN: 978-1-62708-180-1
... 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 fitting that was removed from the fractured lug. (b) The segment of the fractured lug (A) that remained attached...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006786
EISBN: 978-1-62708-295-2
... gear socket assembly due to liquid-metal-induced embrittlement (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...
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
... reddish-brown debris of ferric oxide, which, when mixed with oil or grease, produces debris that is often referred to as “blood,” “cocoa,” or “red mud.” Hence, in components that are lubricated so that ordinary corrosion is not likely to occur, the presence of reddish-brown debris is indicative...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006938
EISBN: 978-1-62708-395-9
... coefficients. The part in question may also be exposed to chemical agents which are present in vehicles, including grease, oil, lubricants, and cleaning agents, as well as external chemicals, such as road salt. Thus, definition of the chemical environment during use is also important. All of these demands...
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
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003541
EISBN: 978-1-62708-180-1
... of the polymer are also known to cause premature failure ( Ref 9 ). Environmentally enhanced failure generally involves crazing or cracking as the underlying mechanism. Degradation by Heat and Light <xref rid="a0003541-ref5" ref-type="bibr">(Ref 5)</xref> Another serious consideration in failure analysis...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006915
EISBN: 978-1-62708-395-9
..., and addresses related considerations such as melt viscosity and melt strength, crystallization, orientation, die swell, melt fracture, shrinkage, molded-in stress, and polymer degradation. composition elastic modulus engineering plastics polymer properties polymer structure shear rate...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006865
EISBN: 978-1-62708-395-9
...). (d) 100 °C (212 °F). Courtesy of Mobay Chemical Company Degradation by Heat and Light Another serious consideration in failure analysis of polymers is the fact that their mechanical properties may severely deteriorate by exposure to heat and/or light ( Ref 4 ). Thus, structural components...
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
... at the true interface. The chemical-wear mechanism is initiated if the frictional heat can chemically affect the polymer surface, resulting in the production of degraded polymer molecules. The other important parameter to consider in interfacial wear is the roughness of the counterface. For rough and hard...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006758
EISBN: 978-1-62708-295-2
... caused by improper handling such as attempting to piece two fracture surfaces back together, or allowing contaminants such as oil and grease on the damaged surface. Crack sizes may not be determined with as high a level of certainty as desired due to equipment issues, lack of availability...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006927
EISBN: 978-1-62708-395-9
... such as acids and bases, gasoline and other fuels, and solvents (paint and lacquer thinner, acetone, toluene, etc.). However, there also are chemicals in fats, oils, greases, lubricants, detergents and cleaning solutions, and disinfectants that can affect plastics. How a plastic material is affected...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006913
EISBN: 978-1-62708-395-9
... in.) radius Same as for type 1, particularly for rubber tapes and other narrow widths of thin materials 5 Hemispherical electrodes 12.7 mm (0.5 in.) in diameter (e) Filling and treating compounds, gels, and semisolid compounds and greases, embedding, potting, and encapsulating materials 6 Opposing...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006771
EISBN: 978-1-62708-295-2
... be compared to reference materials to infer what should or should not be present. Reference materials can include starting substrate materials (before and after cleaning processes); pure compounds and coatings used in the manufacturing of the device; dried solvents, oils, greases, and cleaning solution...