Flexural behavior of an FRP sandwich system with glass-fiber skins and a phenolic core at elevated in-service temperature

Manalo, Allan; Surendar, Swetha; Erp, Gerard Van; Benmokrane, Brahim

doi:10.1016/j.compstruct.2016.05.028

Cited by 38 publications

(16 citation statements)

References 20 publications

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“…This is because the former mechanical property was mainly governed by the resin properties and the corresponding fibre-matrix interaction while the latter property was predominantly influenced by the fibre properties [28,29]. Interestingly, this observation corroborates with that of Correia et al [9] who conducted an in-plane shear strength tests, through 10° off-axis tensile tests, on GFRP composites.…”

Section: Stiffnesssupporting

confidence: 80%

Temperature-sensitive mechanical properties of GFRP composites in longitudinal and transverse directions: A comparative study

Ferdous

Maranan

Sharma

et al. 2017

Composite Structures

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A comparative study was conducted to evaluate the temperature-sensitive mechanical properties of glass fibre reinforced polymer (GFRP) composites in the longitudinal and transverse directions. GFRP coupons with different shear span-to-depth ratios were tested under three-point static bending test at temperatures ranging from room temperature up to 200 o C. Timoshenko Beam Theory-based procedure was then adopted to calculate the flexural and shear moduli of the GFRP laminates under moderate and elevated in-service temperatures.The results showed that the mechanical properties of the transversely cut specimens is affected more by the increase in temperature than the longitudinally cut specimens. Similarly, the interlaminar shear and flexural strengths of GFRP composites were found influenced more by elevated temperature compared to the stiffness properties. Moreover, the shear modulus undergone more severe degradation compared to the flexural modulus. Simplified empirical models were proposed to estimate the mechanical properties of the GFRP pultruded laminates in both the longitudinal and transverse directions at varying temperatures.

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Section: Stiffnesssupporting

confidence: 80%

Temperature-sensitive mechanical properties of GFRP composites in longitudinal and transverse directions: A comparative study

Ferdous

Maranan

Sharma

et al. 2017

Composite Structures

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“…Epoxy resins are now commonly used as matrices in fibre reinforced polymer (FRP) composites as well as in coating, binding and adhesive materials [1][2]. This thermosetting resin is used for pavement overlays, wastewater pipes, hazardous waste containers, and decorative construction panels in aggressive environmental conditions [3][4][5][6][7][8][9]. They are also used as infill for structural repair systems [6,10,11] due to their superior properties including modulus and strain, tensile strength, strength development, resistance to chemical attacks and drying shrinkage compared to ordinary Portland cement-based materials.…”

Section: Introductionmentioning

confidence: 99%

“…Asset owners and engineers remain cautious about accepting epoxy matrices in civil infrastructure out of concern about their structural performance in the applications exposed to elevated temperatures. Manalo et al [8] mentioned that the most important reason for this concern is the incomplete and limited information about the temperature dependence of composites for their application, particularly in hot areas. Polansky et al, [18] found that exposing epoxy-based FRP laminates to temperatures ranging from 170°C to 200°C and for a duration of 10 to 480 hours will rapidly decrease the material's glass transition temperature (T g ) due the decrease in reaction to thermal stress.…”

Section: Introductionmentioning

confidence: 99%

Effect of elevated in-service temperature on the mechanical properties and microstructure of particulate-filled epoxy polymers

Khotbehsara

Manalo

Aravinthan

et al. 2019

Polymer Degradation and Stability

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In civil engineering applications, epoxy-based polymers are subject to different environmental conditions including in-service temperature, which might accelerate their degradation and limit their application ranges. Recently, different particulate fillers were introduced to enhance the mechanical properties and reduce the cost of epoxy-based polymers. This paper addresses the effect of in-service elevated temperature (from room temperature to 80 o C) in particulate-filled epoxy based resin containing up to 60% by volume of fire retardant and fly ash fillers through a deep understanding of the microstructure and analysis of their mechanistic response. An improvement in the retention of mechanical properties at in-service elevated temperature was achieved by increasing the percentages of fillers. The retention of compressive and split tensile strength at 80 o C for the mix containing 60% fillers was 72% and 52%, respectively, which was significantly higher than the neat epoxy. Thermo-dynamic analysis showed an increase in glass transition temperature with the inclusion of fillers, while these mixes also experienced less weight loss compared to neat epoxy, indicating better thermal stability. Scanning electron microscopy images showed the formation of dense microstructures for particulate-filled epoxy based resin at elevated temperatures. This indicates that the particulate filled epoxy resin exhibits better engineering

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“…The other two conditions were detrimental due to the presence of moisture, which could intensify the adverse effects of freeze/thaw and UV cycles. It is well known that the resin matrix degradation is the primary factor responsible for the degradation of FRPs’ mechanical properties [75]. Therefore, the laminates with continuous unidirectional fibers are resistant to material degradation as they have more fibers in the direction of the applied load compared to the woven and random fiber laminates.…”

Section: Resultsmentioning

confidence: 99%

Effect of Fibers Configuration and Thickness on Tensile Behavior of GFRP Laminates Exposed to Harsh Environment

et al. 2019

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The present study indicates the importance of using glass fiber reinforced polymer (GFRP) laminates with appropriate thickness and fibers orientation when exposed to harsh environmental conditions. The effect of different environmental conditions on tensile properties of different GFRP laminates is investigated. Laminates were exposed to three environmental conditions: (1) Freeze/thaw cycles without the presence of moisture, (2) freeze/thaw cycles with the presence of moisture and (3) UV radiation and water vapor condensation cycles. The effect of fiber configuration and laminate thickness were investigated by considering three types of fiber arrangement: (1) Continuous unidirectional, (2) continuous woven and (3) chopped strand mat and two thicknesses (2 and 5 mm). Microstructure and tensile properties of the laminates after exposure to different periods of conditioning (0, 750, 1250 and 2000 h) were studied using SEM and tensile tests. Statistical analyses were used to quantify the obtained results and propose prediction models. The results showed that the condition comprising UV radiation and moisture condition was the most aggressive, while dry freeze/thaw environment was the least. Furthermore, the laminates with chopped strand mat and continuous unidirectional fibers respectively experienced the highest and the lowest reductions properties in all environmental conditions. The maximum reductions in tensile strength for chopped strand mat laminates were about 7%, 32%, and 42% in the dry freeze/thaw, wet freeze/thaw and UV with moisture environments, respectively. The corresponding decreases in the tensile strength for unidirectional laminates were negligible, 17% and 23%, whereas those for the woven laminates were and 7%, 24%, and 34%.

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Flexural behavior of an FRP sandwich system with glass-fiber skins and a phenolic core at elevated in-service temperature

Cited by 38 publications

References 20 publications

Temperature-sensitive mechanical properties of GFRP composites in longitudinal and transverse directions: A comparative study

Temperature-sensitive mechanical properties of GFRP composites in longitudinal and transverse directions: A comparative study

Effect of elevated in-service temperature on the mechanical properties and microstructure of particulate-filled epoxy polymers

Effect of Fibers Configuration and Thickness on Tensile Behavior of GFRP Laminates Exposed to Harsh Environment

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