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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
... different temperatures and strain rates Fig. 11 Tensile stress-strain curves for several types of polymeric materials. Source: Ref 23 Fig. 12 Thermal dependence of elastic modulus for a typical polymer. Source: Ref 8 Fig. 2 Viscosity (η) dependence on molecular weight...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006849
EISBN: 978-1-62708-395-9
... Fig. 1 ASTM solution viscosity relationships Fig. 2 Examples of viscosity behavior Fig. 4 Torque rheometry as a function of molecular weight Fig. 5 Torque rheometry as a function of parts per hundred of filler Fig. 6 Torque rheometry as a function...
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.modes.c0090463
EISBN: 978-1-62708-234-1
... 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 contact...
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 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 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 (visual...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006930
EISBN: 978-1-62708-395-9
... parameter Symbol Units Velocity, angular velocity Shear rate γ ˙ 1/sec Displacement, angular displacement Shear strain γ … Force, torque Shear stress σ N/m 2 (Pa) Ratio Symbol Units Viscosity = stress/shear rate η Pa-sec Modulus(t) = stress(t)/strain G...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006924
EISBN: 978-1-62708-395-9
... Fig. 4 Viscosity as a function of shear rate for a highly filled uncured epoxy formulation. Source: Ref 11 Fig. 6 Steady-state viscosity as a function of shear rate for an epoxy resin with various levels of silica filler. Source: Ref 12 Fig. 7 Schematic representation of cure...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006916
EISBN: 978-1-62708-395-9
..., and impact strength of polyester. Adapted from Ref 4 Fig. 4 Results of the viscosity tests. Relative viscosity values: Bad lot—43, Good lot—48, Specifications—47 to 51 Fig. 7 Part that failed because of voids created by underpacking Fig. 8 (a) Part that cracked because...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.9781627083959
EISBN: 978-1-62708-395-9
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
... an order of magnitude difference between the two 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...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006931
EISBN: 978-1-62708-395-9
... … Osmometry, membrane Number-average molecular weight, M ¯¯¯¯n … M ¯¯¯¯n=103 to 106 Osmometry, vapor pressure to 30,000, interactions polymer/solvent M ¯¯¯¯n … M ¯¯¯¯n=300 Dilute solution viscosity Inherent viscosity, reduced viscosity, intrinsic viscosity Viscosity determination...
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
... transition was also apparent. The (I) indicates that the numerical temperature was determined as the inflection point on the curve. In order to assess the molecular weight of the housing material, the intrinsic viscosity of the resin was measured. A comparison of the results with historical data...
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
... ) 2 = ( 1 − ε 2 ) 2 ε π ( 1 + 0.62 ε 2 ) where η is the lubricant viscosity (which changes with temperature and pressure); N is the shaft speed (in revolutions per minute); p = W / DL , or the average pressure between the shaft and bearing 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
... viscosity and solution viscosity techniques, of producing results that directly represent the actual molecular weight and molecular weight distribution of the plastic resin. Another advantage is that GPC requires a relatively small sample size, 30 to 120 μg, for a complete evaluation ( Ref 7...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006933
EISBN: 978-1-62708-395-9
..., viscous 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 Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006935
EISBN: 978-1-62708-395-9
... glass. The material can be molded at lower pressures, so somewhat larger components can be produced on the same equipment, but there is a limit to part complexity due to the oriented glass. Lower resin viscosity demands care with use of slides and cores. As with all high-pressure processes, hollow...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006864
EISBN: 978-1-62708-395-9
... length of feed opening should be greater than the screw diameter. Lower melt viscosity Lower screw speed Decrease channel width Increase channel depth Use multiflighted mixing section at the end of the screw Solid bed breakup Poor transition-zone screw design Reduce...
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
... ) 2 ( L D ) 2 = ( 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...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006926
EISBN: 978-1-62708-395-9
... ) Considering the simple viscous flow, Eq 3 can be given by: (Eq 4) ∂ ϕ / ∂ t = ( P + σ ) / η where η is the viscosity of the swollen material under stress, which can be described by: (Eq 5) η = η 0 exp ( − mϕ ) exp [ − n ( P + σ ) ] where...