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Book Chapter
Failure Analysis of Epoxy Resin Encapsulant During a Long-Term Storage
Available to PurchaseSeries: 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...
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 with thermogravimetric analysis. Based on test data, the epoxy resin had not been properly cured and was hydrolyzed in its compromised state because of humidity. Hence, the depolymerized material gradually softened to the point where the effect of creep caused it to flow, ultimately causing the failure.
Book Chapter
Compression Fracture of a Graphite-Epoxy Test Structure Due to a Buckling Instability
Available to PurchaseSeries: 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...
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 of the compression-loading skin panel were revealed by nondestructive visual examination. A band of de-lamination between the areas of through-thickness skin fracture at the front and rear spar was revealed. A map of the local directions of crack propagation over the fracture surface was generated by the orientation of river patterns and resin microflow during microscopic examination of sectioned samples of the panel. It was discovered that crack initiation occurred at the periphery of a fastener hole located at the front spar. Propagation occurred chordwise across the compression-loaded skin panel. As a corrective measure, the fastener spacing was reduced to prevent the buckling mode that precipitated fracture.
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Good edge retention obtained in a cast epoxy mount containing soft ceramic ...
Available to PurchasePublished: 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.
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in Failure Analysis of Epoxy Resin Encapsulant During a Long-Term Storage
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 1 Curing mechanism of epoxy resin with anhydride as curing agent
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in Failure Analysis of Epoxy Resin Encapsulant During a Long-Term Storage
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 2 Fault tree for failure of epoxy resin encapsulant
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FTIR spectra of epoxy resin encapsulants ( a ) The whole spectra ( b ) Magn...
Available to Purchase
in Failure Analysis of Epoxy Resin Encapsulant During a Long-Term Storage
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 3 FTIR spectra of epoxy resin encapsulants ( a ) The whole spectra ( b ) Magnified spectra of carbonyl group
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in Failure Analysis of Epoxy Resin Encapsulant During a Long-Term Storage
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 4 EDS spectra of epoxy resin encapsulants
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in Failure Analysis of Epoxy Resin Encapsulant During a Long-Term Storage
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 5 TGA curves of epoxy resin encapsulants
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in Failure Analysis of Epoxy Resin Encapsulant During a Long-Term Storage
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 6 DSC curves of epoxy resin encapsulants
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in Failure Analysis of Heat Exchangers
> Analysis and Prevention of Component and Equipment Failures
Published: 30 August 2021
Fig. 18 Indications of rust behind the epoxy lining. Source: Ref 3
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SEM fractographs of an epoxy resin fractured by impact at ambient temperatu...
Available to PurchasePublished: 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×
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SEM fractographs of an epoxy resin fractured by impact at liquid nitrogen t...
Available to PurchasePublished: 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
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Relationship for Tg and fractional conversion for an epoxy–amine system. Th...
Available to Purchase
in Manufacturing-Related Failures of Plastic Parts
> Characterization and Failure Analysis of Plastics
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
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Schematic of the wear process of fiber-reinforced epoxy composite. Adapted ...
Available to PurchasePublished: 15 May 2022
Fig. 11 Schematic of the wear process of fiber-reinforced epoxy composite. Adapted from Ref 56
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Typical dynamic mechanical spectrum of high-temperature epoxy resin system....
Available to PurchasePublished: 15 May 2022
Fig. 3 Typical dynamic mechanical spectrum of high-temperature epoxy resin system. G ′, shear modulus; G ″, loss modulus
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Differential scanning calorimetry thermogram of Fiberite 934 epoxy, 4.89 mg...
Available to PurchasePublished: 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
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in Characterization of Thermosetting Resins and Polymers
> Characterization and Failure Analysis of Plastics
Published: 15 May 2022
Fig. 2 Epoxy reaction with primary amine
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Viscosity as a function of shear rate for a highly filled uncured epoxy for...
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in Characterization of Thermosetting Resins and Polymers
> Characterization and Failure Analysis of Plastics
Published: 15 May 2022
Fig. 4 Viscosity as a function of shear rate for a highly filled uncured epoxy formulation. Source: Ref 11
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Steady-state viscosity as a function of shear rate for an epoxy resin with ...
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in Characterization of Thermosetting Resins and Polymers
> Characterization and Failure Analysis of Plastics
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
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Isothermal differential scanning calorimetry of epoxy resin at three temper...
Available to Purchase
in Characterization of Thermosetting Resins and Polymers
> Characterization and Failure Analysis of Plastics
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
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