Durability of Glass Fibre Reinforced Polymer Pultruded Profiles: Comparison Between QUV Accelerated Exposure and Natural Weathering in a Mediterranean Climate

Sousa, João M.; Correia, João R.; Cabral-Fonseca, S.

doi:10.1007/s40799-016-0024-x

Cited by 47 publications

(9 citation statements)

References 20 publications

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“…They reveal cracks and the exposure of the embedded fibers from under the epoxy subjected to deterioration from acid attack, sustained/assisted by the diffusion of corrosion species. Similar findings have been reported by many researchers [27,[50][51][52], who have stated that glass and Kevlar fiber-reinforced polymer composites degrade when subjected to environmental aging. However, the attack was more noticeable in the case of KFRP, since the greater degree of degradation in the fiber and fiber/matrix interface was recognized because of the greater moisture uptake of the Kevlar material.…”

Section: Sem Analysissupporting

confidence: 91%

Towards the Development of Novel Hybrid Composite Steel Pipes: Electrochemical Evaluation of Fiber-Reinforced Polymer Layered Steel against Corrosion

et al. 2021

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Corrosion remains one of the major and most costly challenges faced by the steel industry. Various fiber-reinforced polymer coating systems have been proposed to protect metallic piping distribution networks against corrosion. Despite increasing interest among scientific and industrial communities, there is only limited predictive capability for selecting the optimum composite system for a given corrosive condition. In this study, we present a comprehensive evaluation of the electrochemical behavior of two different fiber-reinforced polymer composite systems against the corrosion of carbon steel pipes under a wide range of acidic and corrosive solutions. The composites were made of glass and Kevlar fibers with an epoxy resin matrix and were subjected to corrosive solutions of 0.5 M NaCl, 0.5 M HCl, and 0.5 M H2SO4. The kinetics of the corrosion reactions were evaluated using potentiodynamic polarization (PDP) tests. In addition, electrochemical impedance spectroscopy (EIS) tests were carried out at open circuit potentials (OCPs). It was demonstrated that the glass fiber-reinforced polymer coating system offered the best protection against corrosion, with a high stability against deterioration when compared with epoxy and Kevlar fiber-reinforced polymer coating systems. Scanning electron microscopy images revealed cracks and deteriorated embedded fibers due to acid attack, sustained/assisted by the diffusion of the corrosion species.

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Section: Sem Analysissupporting

confidence: 91%

Towards the Development of Novel Hybrid Composite Steel Pipes: Electrochemical Evaluation of Fiber-Reinforced Polymer Layered Steel against Corrosion

et al. 2021

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“…The irradiance level is further correlated with the natural day level in Lisbon, an urban Mediterranean environment. 37 Accordingly, 40 days of Q-UV accelerated weathering are equivalent to 450 natural days of exposure at Lisbon. 37…”

Section: Resultsmentioning

confidence: 99%

“…37 Accordingly, 40 days of Q-UV accelerated weathering are equivalent to 450 natural days of exposure at Lisbon. 37…”

Section: Resultsmentioning

confidence: 99%

“…For the present study, the above-mentioned two sets of specimens are exposed to UV radiation in the 295-365 nm band at a temperature of 50 C. An irradiance level of 0.89 W/m 2 at 340 nm is chosen to match the typical maximum irradiance of sunlight during summer at noon as per the ASTM: G154. 36,37 The temperature is maintained at 50 C, higher than the room temperature to accelerate the weathering process. However, this is less than the glass transition temperature (T g ) of epoxy resin (99 C) used.…”

Section: Uv Weathering Conditionsmentioning

confidence: 99%

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Ultra-violet health monitoring of smart composite laminate using embedded fiber Bragg grating sensors

Mohanta

Padarthi

Chokkapu

et al. 2020

Journal of Composite Materials

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A novel approach is developed to evaluate the property retention on prolonged ultra-violet exposure and hence, health monitoring of glass fiber reinforced polymer composite laminate. This is achieved in a non-destructive manner by mapping the strength retention with the established strain. Embedded fiber Bragg grating sensor and strain gauges are employed to monitor the strain evolution within the laminate. Tensile and flexural tests are conducted at regular intervals to estimate the mechanical strength retention with varying duration of ultra-violet exposure. Through this analysis, it is observed that the property degradation mechanism follows the first-order reaction kinetics. The degradation of matrix material along with the stress relaxation over time develops the stress–strain fields near the interfaces of matrix and fiber. Moreover, the established strain is interpreted by formulating the model that considers the unifying influence of stress relaxation and chemical degradation. This model has closely (R2 = 0.9810 and 0.9790) predicted the experimental data of strain than the existing ones (R2 = 0.9142 and 0.9119). Besides, property retention is mapped with the predicted strain. More importantly, FESEM and FTIR confirm the fact that ultra-violet radiation degrades the matrix material, and thus the mechanical property gets significantly deteriorated. This suggests that the strain measurement is an effective, non-destructive and health monitoring technique to assess the property degradation of the manufactured glass fiber reinforced polymer composites.

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“…They found that UV mainly resulted in gloss loss and a change in color (surface yellowing). Further experimental study was conducted by Sousa et al [8]. They reported that the tensile strength of glass fiber reinforced polymer (GFRP) profiles made of unsaturated polyester (UP) and vinylester (VE) decreased by 21% and 3% after 3000 h of artificial accelerated aging weathering chamber (QUV) exposure, respectively.…”

Section: Introductionmentioning

confidence: 99%

Improving durability of glass fiber reinforced polymer composites by incorporation of ZnO/OMMT nanoparticles subjected to UV radiation and hygrothermal aging

Fang

Wang

et al. 2020

Mater. Res. Express

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Glass fiber reinforced polymer (GFRP) composites have high sensitivity to UV radiation, temperature, and moisture, and these factors lead to the decrease of mechanical properties. This study attempts to modify unsaturated polyester (UP) and vinylester (VE) resins with nano zinc oxide (ZnO) and organomontmorillonite (OMMT), in order to improve UV radiation resistance and hygrothermal resistance. The nano ZnO/OMMT modified UP and VE based GFRP composites were subjected to UV radiation and hygrothermal aging at 30°C, 50°C and 60°C (95% RH) for 90 days. Mass loss, moisture uptake, color change, flexural properties and short-beam-shear test were investigated. In comparison to unmodified GFRP specimens, ZnO/OMMT modifying decreased the mass loss, the color change, saturation moisture uptake, and the coefficient of diffusion. After exposure in UV radiation for 90 days, the flexural strength and interlaminar shear strength of nano modified GFRP composites increased by 23.5% and 27.8% compared with those of the unmodified GFRP composites. Nano ZnO/OMMT modifying also increased the flexural strength and interlaminar shear strength by 26.5% and 27.2% in hygrothermal condition at 60°C. Furthermore, based on the change of mechanical properties and Arrhenius rate model, a prediction model was proposed to predict the life of nano modified FRP composites.

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Durability of Glass Fibre Reinforced Polymer Pultruded Profiles: Comparison Between QUV Accelerated Exposure and Natural Weathering in a Mediterranean Climate

Cited by 47 publications

References 20 publications

Towards the Development of Novel Hybrid Composite Steel Pipes: Electrochemical Evaluation of Fiber-Reinforced Polymer Layered Steel against Corrosion

Towards the Development of Novel Hybrid Composite Steel Pipes: Electrochemical Evaluation of Fiber-Reinforced Polymer Layered Steel against Corrosion

Ultra-violet health monitoring of smart composite laminate using embedded fiber Bragg grating sensors

Improving durability of glass fiber reinforced polymer composites by incorporation of ZnO/OMMT nanoparticles subjected to UV radiation and hygrothermal aging

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