Microscopic and Mesoscopic Evaluations of Materials. The Mechanism of Damage around Crack Tip in Rubber-Modified Epoxy Resin.

The fracture behavior of an interface crack tip has significant influence on the structural integrity of an adhesive joint. We investigate a damage zone and the deformation of rubber particles around a tip of an interface crack between rubber-modified epoxy resin and aluminum. They are compared with those around a crack tip in homogeneous rubber-modified epoxy resin. Cavitations in rubber particles are observed around a damaged crack tip in homogeneous resin but not around a damaged interface crack tip. Rubber particles around an interface crack tip are deformed ellipsoidally due to the residual stress even before being damaged, and interfaces between rubber particles and epoxy resin around an interface crack tip are debonded after being damaged.

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Damage zone around crack tip and fracture toughness of rubber-modified epoxy resin under mixed-mode conditions

Engineering Fracture Mechanics ◽

10.1016/s0013-7944(01)00151-5 ◽

2002 ◽

Vol 69 (12) ◽

pp. 1363-1375 ◽

Cited By ~ 25

Author(s):

Deok-Bo Lee ◽

Toru Ikeda ◽

Noriyuki Miyazaki ◽

Nak-Sam Choi

Keyword(s):

Fracture Toughness ◽

Epoxy Resin ◽

Mixed Mode ◽

Damage Zone ◽

Crack Tip ◽

Modified Epoxy

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Damage Zone around Crack Tip and Fracture Toughness of Rubber-Modified Epoxy Resin under Mixed Mode Condition.

Journal of the Society of Materials Science Japan ◽

10.2472/jsms.50.55 ◽

2001 ◽

Vol 50 (1) ◽

pp. 55-61 ◽

Cited By ~ 2

Author(s):

Deok-bo LEE ◽

Toru IKEDA ◽

Noriyuki MIYAZAKI

Keyword(s):

Fracture Toughness ◽

Epoxy Resin ◽

Mixed Mode ◽

Damage Zone ◽

Crack Tip ◽

Modified Epoxy

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Damage Zone around Crack Tip for Two-Phase Adhesive Joint with Rubber-Modified Epoxy Resin.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A ◽

10.1299/kikaia.66.939 ◽

2000 ◽

Vol 66 (645) ◽

pp. 939-945

Author(s):

Deok-bo LEE ◽

Toru IKEDA ◽

Noriyuki MIYAZAKI

Keyword(s):

Epoxy Resin ◽

Adhesive Joint ◽

Damage Zone ◽

Crack Tip ◽

Two Phase ◽

Modified Epoxy

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Failure Analysis on Rubber-Modified Epoxy Resin under Various Loading Speed Conditions

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.297-300.1907 ◽

2005 ◽

Vol 297-300 ◽

pp. 1907-1912 ◽

Cited By ~ 2

Author(s):

Deok Bo Lee ◽

Joo Hyung Kim

Keyword(s):

Fracture Toughness ◽

Composite Material ◽

Epoxy Resin ◽

Structural Reliability ◽

Fiber Composite ◽

Damage Zone ◽

Crack Tip ◽

Rubber Content ◽

The Matrix ◽

Modified Epoxy

A rubber-modified epoxy resin is widely used as adhesive and matrix materials for fiber composite material. The structural reliability of composite material depends on the fracture toughness of the matrix resin. In this study, the fracture toughness and the damage zone around a crack tip in rubber-modified epoxy resin were investigated. The volume fractures of rubber (CTBN1300×8) in the rubber-modified epoxy resin were 0%, 5% and 15% under several loading speeds. The fracture toughness(KIC) and the fracture energy(GIC) were measured by using 3-point bending specimens. The 4-point bending specimens were also used to observe damage zones at the vicinity of a crack tip in modified resins. The results show that the values of the fracture toughness and the sizes of damage zones at 5% and 15% rubber content decrease with increase in loading speed.

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The Mechanical Properties of Organic Modified Epoxy Resin

The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science ◽

10.35219/mms.2020.3.02 ◽

2020 ◽

Vol 43 (3) ◽

pp. 10-14

Author(s):

Georgel MIHU ◽

Claudia Veronica UNGUREANU ◽

Vasile BRIA ◽

Marina BUNEA ◽

Rodica CHIHAI PEȚU ◽

...

Keyword(s):

Mechanical Properties ◽

Composite Materials ◽

Epoxy Resin ◽

Epoxy Matrix ◽

Epoxy Resins ◽

Mechanical Tests ◽

Organic Modification ◽

Three Point Bending ◽

Modified Epoxy

Epoxy resins have been presenting a lot of scientific and technical interests and organic modified epoxy resins have recently receiving a great deal of attention. For obtaining the composite materials with good mechanical proprieties, a large variety of organic modification agents were used. For this study gluten and gelatin had been used as modifying agents thinking that their dispersion inside the polymer could increase the polymer biocompatibility. Equal amounts of the proteins were milled together and the obtained compound was used to form 1 to 5% weight ratios organic agents modified epoxy materials. To highlight the effect of these proteins in epoxy matrix mechanical tests as three-point bending and compression were performed.

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Hydrophobic Modification of Graphene Oxide and Its Effect on the Corrosion Resistance of Silicone-Modified Epoxy Resin

Metals ◽

10.3390/met11010089 ◽

2021 ◽

Vol 11 (1) ◽

pp. 89

Author(s):

Wei Yuan ◽

Qian Hu ◽

Jiao Zhang ◽

Feng Huang ◽

Jing Liu

Keyword(s):

Contact Angle ◽

Corrosion Resistance ◽

Graphene Oxide ◽

Physical Properties ◽

Epoxy Resin ◽

Electrochemical Impedance ◽

Salt Spray ◽

X Ray ◽

Modified Graphene Oxide ◽

Modified Epoxy

This study modified graphene oxide (GO) with hydrophilic octadecylamine (ODA) via covalent bonding to improve its dispersion in silicone-modified epoxy resin (SMER) coatings. The structural and physical properties of ODA-GO were characterized by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and contact angle tests. The ODA-GO composite materials were added to SMER coatings by physical mixing. FE-SEM, water absorption, and contact angle tests were used to evaluate the physical properties of the ODA-GO/SMER coatings, while salt spray, electrochemical impedance spectroscopy (EIS), and scanning Kelvin probe (SKP) methods were used to test the anticorrosive performance of ODA-GO/SMER composite coatings on Q235 steel substrates. It was found that ODA was successfully grafted onto the surfaces of GO. The resulting ODA-GO material exhibited good hydrophobicity and dispersion in SMER coatings. The anticorrosive properties of the ODA-GO/SMER coatings were significantly improved due to the increased interfacial adhesion between the nanosheets and SMER, lengthening of the corrosive solution diffusion path, and increased cathodic peeling resistance. The 1 wt.% ODA-GO/SMER coating provided the best corrosion resistance than SMER coatings with other amounts of ODA-GO (including no addition). After immersion in 3.5 wt.% NaCl solution for 28 days, the low-frequency end impedance value of the 1 wt.% ODA-GO/SMER coating remained high, at 6.2 × 108 Ω·cm2.

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