A comparative study of mode I delamination behavior of unidirectional glass fiber-reinforced polymers with epoxy and polyurethane matrices using two methods

Montenegro, Davi M.; Pappas, Georgios A.; Botsis, J.; Zogg, Markus; Wegener, Konrad

doi:10.1016/j.engfracmech.2018.12.008

Cited by 14 publications

(8 citation statements)

References 30 publications

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“…However, one should note that a limited difference between the values of G and J is expected based on the information available in the literature. Fracture energies obtained through LEFM or the J-integral method differed by no more than 5% in glass/epoxy composites in the case of large scale fiber bridging [36]. Moreover, assuming the value of J-integral very close to G Ic did not impose a significant error on deriving a cohesive law and then in simulating delamination growth with finite element models in glass/epoxy composites similar to the one being studied here [37].…”

Section: Test Method Data Acquisition and Data Reductionmentioning

confidence: 79%

Loading rate effects on mode-I delamination in glass/epoxy and glass/CNF/epoxy laminated composites

Ekhtiyari

Shokrieh

Alderliesten

2020

Engineering Fracture Mechanics

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The main objective of the present study is to assess the loading rate effects on mode-I delamination growth in glass/epoxy laminated composites. Furthermore, hybrid reinforcement of these composites by incorporating carbon nanofibers (CNFs) was followed to enhance the interlaminar fracture resistance and affect its loading rate sensitivity. Experiments on DCB specimens made of glass/epoxy and glass/CNF/epoxy laminated composites were conducted by varying the loading rate from standard quasi-static testing up to 200 mm/sec crosshead speed in a servo-hydraulic test machine. More than 21% decrease was observed in the propagation fracture toughness of the glass/epoxy samples due to loading rate elevation in the studied range. Moreover, the results of the present study clearly show the benefits of CNF modification, not only in enhancing the fracture toughness but also in reducing the loading rate dependency. Adding CNFs to glass/epoxy composites caused 32.8% and 13.5% increase in the quasi-static values of the initiation-and propagation-interlaminar fracture toughness (G IC), respectively. Also, owing to CNF incorporation, the maximum drop in the propagation fracture toughness at elevated loading rates was decreased to 8%. Fractography inspections were performed to provide an in-depth explanation for the observed loading rate effects and the advantages of CNF reinforcement.

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Section: Test Method Data Acquisition and Data Reductionmentioning

confidence: 79%

Loading rate effects on mode-I delamination in glass/epoxy and glass/CNF/epoxy laminated composites

Ekhtiyari

Shokrieh

Alderliesten

2020

Engineering Fracture Mechanics

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“…The epoxy resin belongs to a class of thermosetting polymers that undergo cross linking when polymerized in the presence of a hardener (cross linker). The matrix material was prepared with ixture of the epoxy resin and hardener in the volume ratio of 2:1 [26].…”

Section: Moisture Absorption Testmentioning

confidence: 99%

“…Following ASTM D3039 / D3039M-00 (2006) method, [30]. Traction strength of dog bone shape specimens of 140 to 35 to 10 mm was performed using the standard ultimate testing machine (UTM), Shimadzu (Model AG-1) with 20 mm/min cross head speed [17,26].…”

Section: Tensile Strength Testmentioning

confidence: 99%

Studies on physico-mechanical behaviour of kenaf/glass fiber reinforced epoxy hybrid composites

Birniwa¹,

Abdullahi²,

Yakasai³

et al. 2021

Bull. Chem. Soc. Eth.

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In this study, various treated, untreated, and treated kenaf/glass fiber composites were fabricated using epoxy resin. A portion of kenaf fibers were subjected to treatment with alkali, sub-portion was taken for benzoyl peroxide and potassium permanganate prior to composite fabrication. This treatment on the composite material was undertaken to achieve improved modification of the interface between the matrix and fiber bond. A portion of the glass fiber was used for enhancing the mechanical properties of the hybrid composite. The tensile strength, flexural, density, water absorption and chemical resistance of the composites were analyzed using standard methods. FTIR was conducted on the fiber to ascertain the chemical treatment on the fibers, FESEM was used for the morphological study. The results obtained showed that the tensile and flexural strength improved from 46.45-298.3 kgf, and 10.5-54.7 kgf, respectively, in the composite samples. Chemical resistance of the kenaf fiber treated potassium permanganate composite improved compared to the untreated fiber composite in both cases. The density and water absorption properties of the composites were found to decrease in the treated fibers compared to untreated fiber composites, this treated composites showed less water absorption and density. The FTIR result revealed that reaction has taken place between the fiber and the treatment reagent. Hence, fiber modification has improved the properties of the composites due to increase in fiber-matrix interaction. KEY WORDS: Chemical properties, Epoxy resin, Hybrid, Kenaf, Mechanical strength, Natural fiber Bull. Chem. Soc. Ethiop. 2021, 35(1), 171-184. DOI: https://dx.doi.org/10.4314/bcse.v35i1.15

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“…Polyurethane is a low cost, high performance polymer, whose durability contributes significantly to the long lifetimes of many products. In recent years, PU has been increasingly used as a reinforcement material for composites because of its excellent mechanical properties and fast reaction times . Weather resistance is important for PUs used in outdoor applications.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, PU has been increasingly used as a reinforcement material for composites because of its excellent mechanical properties and fast reaction times. 2,3 Weather resistance is important for PUs used in outdoor applications. Polyurethane composites are used in composite profiles in structural applications 4 (eg, in trams, trains and buses as outdoor roofs and side covers), and also in construction (eg, windows) or as reinforcements for structures.…”

Section: Introductionmentioning

confidence: 99%

The influence of ultraviolet radiation on the optical properties of glass fibre reinforcements for polyurethane matrix composites

Sedlačík

Osička

Pavlı́nek

et al. 2019

Coloration Technology

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Polyurethanes represent one of the most frequently used polymeric matrixes in composites. Although there have been many studies focused on the weather resistance of polyurethanes, this important property is unheeded during the reinforcing phase. In this article, the effects of ultraviolet (UV) radiation on the changes in optical properties of commercially available glass fibre reinforcements containing various polymeric binders used as compatibilising agents for the polymeric matrix in the final composite products were studied. The standardised experiments were performed using accelerated ageing equipment, q‐lab ultraviolet tester, in dry mode. Chemical modification of the binder in the form of polyesters or silanes by UV irradiation was studied using Fourier Transform–infrared spectroscopy. Changes in the optical properties caused by the degradation processes of polymeric components due to UV irradiation were evaluated based on colour changes in the examined samples using the yellowness index; statistical evaluation of the data obtained was conducted with an Anderson–Darling test of normality and an ANOVA test. It was demonstrated that both the amount of the binder and the glass fibre reinforcement's construction play a more important role than the chemical structure of the binder.

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A comparative study of mode I delamination behavior of unidirectional glass fiber-reinforced polymers with epoxy and polyurethane matrices using two methods

Cited by 14 publications

References 30 publications

Loading rate effects on mode-I delamination in glass/epoxy and glass/CNF/epoxy laminated composites

Loading rate effects on mode-I delamination in glass/epoxy and glass/CNF/epoxy laminated composites

Studies on physico-mechanical behaviour of kenaf/glass fiber reinforced epoxy hybrid composites

The influence of ultraviolet radiation on the optical properties of glass fibre reinforcements for polyurethane matrix composites

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