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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.c9001798
EISBN: 978-1-62708-241-9
... Abstract The crosslinked epoxy resin encapsulant protecting an electromagnetic valve coil failed during long-term storage and was examined to determine the cause. The investigation included fault-tree analysis, FTIR and EDX spectroscopy, and differential scanning calorimetry...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048498
EISBN: 978-1-62708-234-1
... Abstract A graphite-epoxy tapered-box structure, which consisted of two honeycomb skin panels fastened to a spanwise spar with intermediate chordwise ribs, fractured during testing. Hinge-line deflection of the front spar was revealed. Through-thickness cracks in the forward and trailing edges...
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Published: 01 January 2002
Fig. 15 Good edge retention obtained in a cast epoxy mount containing soft ceramic shot filler. (Note the round particles in the epoxy at the top.) The specimen is annealed H13 hot work die steel, and it was etched with picral. More
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Published: 01 December 2019
Fig. 1 Curing mechanism of epoxy resin with anhydride as curing agent More
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Published: 01 December 2019
Fig. 2 Fault tree for failure of epoxy resin encapsulant More
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Published: 01 December 2019
Fig. 3 FTIR spectra of epoxy resin encapsulants ( a ) The whole spectra ( b ) Magnified spectra of carbonyl group More
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Published: 01 December 2019
Fig. 4 EDS spectra of epoxy resin encapsulants More
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Published: 01 December 2019
Fig. 5 TGA curves of epoxy resin encapsulants More
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Published: 01 December 2019
Fig. 6 DSC curves of epoxy resin encapsulants More
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Published: 30 August 2021
Fig. 18 Indications of rust behind the epoxy lining. Source: Ref 3 More
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Published: 15 May 2022
Fig. 21 SEM fractographs of an epoxy resin fractured by impact at ambient temperature. Direction of fracture from left to right. (a) Close-up view. Original magnification: 100×. (b) River pattern. Original magnification: 1000× More
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Published: 15 May 2022
Fig. 22 SEM fractographs of an epoxy resin fractured by impact at liquid nitrogen temperature. The direction of crack propagation is from left to right. (a) Low-magnification illustration of multiple parabolas. Original magnification: 100×. (b) Higher-magnification illustration of parabolas More
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Published: 15 May 2022
Fig. 19 Relationship for Tg and fractional conversion for an epoxy–amine system. The isothermal curing temperatures are indicated in the figure. Source: Ref 17 . The solid curve represents the best-fit calculation from the modified DiBenedetto equation. Adapted from Ref 19 , 20 More
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Published: 15 May 2022
Fig. 11 Schematic of the wear process of fiber-reinforced epoxy composite. Adapted from Ref 56 More
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Published: 15 May 2022
Fig. 3 Typical dynamic mechanical spectrum of high-temperature epoxy resin system. G ′, shear modulus; G ″, loss modulus More
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Published: 15 May 2022
Fig. 10 Differential scanning calorimetry thermogram of Fiberite 934 epoxy, 4.89 mg (0.075 gr), 10 °C/min (18 °F/min) heating rate. T g , subambient glass transition temperature of uncured resin; T i , initiation temperature or onset of reaction, indicating the beginning of polymerization More
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Published: 15 May 2022
Fig. 2 Epoxy reaction with primary amine More
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Published: 15 May 2022
Fig. 4 Viscosity as a function of shear rate for a highly filled uncured epoxy formulation. Source: Ref 11 More
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Published: 15 May 2022
Fig. 6 Steady-state viscosity as a function of shear rate for an epoxy resin with various levels of silica filler. Source: Ref 12 More
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Published: 15 May 2022
Fig. 11 Isothermal differential scanning calorimetry of epoxy resin at three temperatures. DGEBA, diglycidylether of bisphenol A; EDA, ethylene diamine. Source: Ref 25 More