On the response to hygrothermal aging of pultruded FRPs used in the civil engineering sector

Grammatikos, Sotirios; Evernden, Mark; Mitchels, John M.; Zafari, Behrouz; Mottram, J. T.; Papanicolaou, George

doi:10.1016/j.matdes.2016.02.026

Cited by 99 publications

(55 citation statements)

References 54 publications

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“…Elevated aging temperatures are chosen to increase diffusion rates without degrading the temperature-sensitive matrix material. Exceedingly high temperatures can alter the material physically or 5 chemically as evidenced by non-Fickian diffusion and/or changes in glass transition temperature (Tsai et al, 2009;Grammatikos et al, 2016).…”

Section: Hygrothermal Aging Of Fiber Reinforced Plastics 30mentioning

confidence: 99%

“…Many analysis techniques exist including single parameter analysis (Bourchak et al, 2007;Suzuki et al, 1987;deGroot et al, 1995;Ramirez-Jimenez et al, 2004), clustering and artificial neural networks 5 (Gutkin et al, 2011;Suresh Kumar et al, 2017;Pashmforoush et al, 2012) , as well as detailed waveform analysis (Ni and Iwamoto, 2002;Surgeon and Wevers, 1999;Voth, 2017). In this study, single parameter methods of Fast-Fourier-Transform (FFT) peak frequency and event energy are used to characterize the damage progression of the material.…”

Section: Composites and Acoustic Emissionmentioning

confidence: 99%

“…Although multi-variable techniques permit relationships to be made between many AE parameters in the analysis, differentiating between damage mechanisms remains a challenge. Clustering studies have shown that frequency content of AE waveforms persists as a dominant parameter for differentiating types 15 damage events (Gutkin et al, 2011;Pashmforoush et al, 2012).…”

Section: Composites and Acoustic Emissionmentioning

confidence: 99%

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Effects of moisture absorption on damage progression and strength of unidirectional and cross-ply fiberglass-epoxy composites

Nunemaker¹,

Voth²,

Miller³

et al. 2018

Preprint

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Abstract. Fiber-Reinforced-Polymer composites (FRP's) possess superior mechanical properties and formability, making them a desirable material for construction of large optimized mechanical structures, such as aircraft, wind turbines, and marine hydro kinetic (MHK) devices. However, exposure to harsh marine environments can result in moisture absorption into the microstructure of the FRP's comprising these structures and often degrading mechanical properties. Specifically, 10 laminate static and fatigue strengths are often significantly reduced, which must be considered in design of FRP structures in marine environments. A study of fiber-glass epoxy unidirectional and cross-ply laminates was conducted to investigate hygrothermal effects on the mechanical behavior of a common material system used in wind applications. Several laminates were aged in 50°C distilled water until maximum saturation was reached. Unconditioned control and the saturated samples were tested in quasi-static tension with the accompaniment of Acoustic Emission (AE) monitoring. Cross-ply laminates 15 experienced 54% reduction in strengths from due to moisture absorption, while unidirectional laminates strengths were reduced by 40%. Stress-strain curves and AE activity of the samples were analyzed to identify changes in damage progression due to aging.

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Section: Hygrothermal Aging Of Fiber Reinforced Plastics 30mentioning

confidence: 99%

Section: Composites and Acoustic Emissionmentioning

confidence: 99%

Section: Composites and Acoustic Emissionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of moisture absorption on damage progression and strength of unidirectional and cross-ply fiberglass-epoxy composites

Nunemaker¹,

Voth²,

Miller³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…Numerous research studies have been performed in the past showing the ingress of aqueous solutions with chemicals such as chlorides and sulfates, and even the ingress of pure water, in glass fiber reinforced polymer (GFRP) rebars can lead to gradual degradation of the glass fibers thereby affecting the durability and long-term mechanical performance of GFRP-rebar-incorporated concrete (readers can refer to [14,15] for some pioneering studies and to [16,17] for reviews on this topic). Despite these findings there has been a continuous growth in the use of GFRP rebars in concrete mainly because in real life (vs. laboratory) the resin coat on the lateral surface of the rebars can sufficiently protect the glass fibers.…”

Section: Guidance For Future Researchmentioning

confidence: 99%

Use of recycled FRP reinforcing bar in concrete as coarse aggregate and its impact on the mechanical properties of concrete

Yazdanbakhsh

Bank

Chen

2016

Construction and Building Materials

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“…In addition, the hygrothermal condition, defined as an environment with combined moisture and elevated temperature, is supposed to be the severest environmental condition to cause swelling, plasticization, and degradation of the matrix, which degrades the performance of FRP composites [12,13]. The influence of moisture absorption and temperature on mechanical properties of FRP composites has been documented in literatures [14][15][16]. Chu et al [14] investigated the tensile properties of GFRP profiles made of VE after immersion in deionized water at different temperatures.…”

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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On the response to hygrothermal aging of pultruded FRPs used in the civil engineering sector

Cited by 99 publications

References 54 publications

Effects of moisture absorption on damage progression and strength of unidirectional and cross-ply fiberglass-epoxy composites

Effects of moisture absorption on damage progression and strength of unidirectional and cross-ply fiberglass-epoxy composites

Use of recycled FRP reinforcing bar in concrete as coarse aggregate and its impact on the mechanical properties of concrete

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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