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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 Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090430
EISBN: 978-1-62708-222-8
...Abstract Abstract The handle from a consumer product exhibited an apparent surface defect. The handle had been injection molded from a medium viscosity grade ABS resin. The anomalous appearance was objectionable to the assembler of the final product and resulted in a production lot being placed...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090424
EISBN: 978-1-62708-222-8
...Abstract Abstract A plastic bracket exhibited relatively brittle material properties, which ultimately led to catastrophic failure. The part had been injection molded from a medium-viscosity polycarbonate resin and had been in service for a short duration prior to the failure. Investigation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0090463
EISBN: 978-1-62708-234-1
.... The housing had been injection molded from a commercially available, medium-viscosity grade of PC, formulated with an ultraviolet stabilizer. In addition to the PC housing, the design of the switch included an external protective zinc component installed with a snap-fit and two retained copper press-fit...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0090451
EISBN: 978-1-62708-218-1
... mating materials. An assessment of the molecular weight of the failed jacket samples as well as a non-failed part and the molding resin samples was performed using several techniques. A combination of MFR, intrinsic viscosity, and finally, gel permeation chromatography (GPC) was used, because...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006806
EISBN: 978-1-62708-329-4
... are the same as for the hydrodynamic case, but the governing equations are much more complicated ( Ref 3 ). Elastohydrodynamic lubrication reduces the chances of mechanical wear because the lubricant film increases due to local deformation of the bearing surface, and the lubricant viscosity increases due...
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
... modulus, tan delta Temperature-dependent behavior, aging/degradation, solid-liquid interactions Gel permeation chromatography (GPC) Weight-average molecular weight, molecular weight distribution Degradation, suitability of material for use Melt flow rate (MFR) Melt viscosity Degradation...
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
... weight of the housing material, the intrinsic viscosity of the resin was measured. A comparison of the results with historical data revealed a substantial reduction in the viscosity of the failed part material. This indicated that the housing material had undergone significant molecular degradation...
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
... = ( 1 − ϵ 2 ) 2 ϵ π ( 1 + 0.62 ϵ 2 ) where η is the lubricant viscosity (which will change with temperature and pressure), N is the shaft speed (in rpm), p = W / DL or the average pressure between the shaft and bearing due to the applied load W , L...
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
... for estimating the viscosity ratio, κ Table 12 Guide values for estimating the viscosity ratio, κ Value of κ (unitless) Lubrication regime type Further influences to note ≥4 Full fluid No gain to increase; internal losses ≥2 Fluid No gain to increase; internal losses ≥1 Fluid...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003551
EISBN: 978-1-62708-180-1
... on corrosion failures of refractories and technical ceramics. On the slagging issue only, viscosity, velocity, actual time contact, temperature, partial pressures, total pressure, heat transfer, and mass transfer have a direct effect on failure rates. As an example, Ref 18 includes an enlightening...
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
.... Ingram M. , Hamer C. , and Spikes H. , A New Scuffing Test Using Contra-Rotation , Wear , Vol 328–329 , 2015 , p 229 – 240 10.1016/j.wear.2015.01.080 92. Blok H. , Gear Wear as Related to Viscosity of Gear Oils , Proc. Summer Conf.—MIT, Mech. Wear , Vol 61 ( No. 25...
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
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
.... The bulk temperature and the temperature at the contact point are important for their effects on viscosity and additive chemistry, both at startup and during operation. The temperatures become especially critical at high pitch-line velocities, that is, more than approximately 30 m/s (100 ft/s) or 4500 rpm...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
... of material from the surface of a bearing race depends on the lubricant viscosity and/or film thickness. Various theories have been proposed that attribute the spalling to hydrostatic pressure of the lubricant being forced into surface cracks to propagate them. Another theory states that the propagation...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003522
EISBN: 978-1-62708-180-1
... on the transition temperatures. The next step is to determine the MW and/or MWD of the polymer. A primary method (such as light scattering) or secondary methods (such as dilute solution viscosity, gel permeation chromatography (GPC), or melt rheology) can be used to characterize the MW and MWD. Differences in MW...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006757
EISBN: 978-1-62708-295-2
... chromatography (GPC) Weight-average molecular weight, M ¯ w ; molecular weight distribution (MWD) Low-angle light scattering M ¯ w , MWD Osmometry, membrane Number-average molecular weight, M ¯ n Osmometry, vapor pressure M ¯ n Dilute solution viscosity...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001087
EISBN: 978-1-62708-214-3
... to limestone slurry without appropriate modification of the pump. The viscosity of limestone slurry is much lower than that of lime slurry. The conversion to limestone slurry without altering the pump speed or impeller design resulted in fluid dynamics outside the operational limits of the pump. Remedial...
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
... crack nucleation and wear debris formation. In repetitive normal impact applications with lubrication, it is probable that asperity contact will be frequent, except for combinations of low-contact pressure, high-viscosity oils, and low surface roughness. It is likely, therefore, that the contact...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001357
EISBN: 978-1-62708-215-0
...% 254 280    85% 351 365 Sulfur, w/c 0.50 0.55 Cetene index 48 48 Inflammation point (°C) 60 70 Draining point (°C) 5 5 Viscosity SSU at 37.8°C 35 38 Ashes w/c Traces Traces Oxidation stability test Do not pass Do not pass Neutralization number, mg KOH/g 0.3...