“…37 HFRP samples are more hydrophilic (due to the presence of Kevlar), than CFRP (slightly hydrophilic) and GFRP that does not contain Kevlar in their base composition. 22,38 Figure 6.Moisture absorption curves of CFRP, HFRP and GFRP, subjected to the aging process in saline water, at 70°C and a time of 1122 h (51 days).…”
Section: Resultsmentioning
confidence: 99%
“…37 HFRP samples are more hydrophilic (due to the presence of Kevlar), than CFRP (slightly hydrophilic) and GFRP that does not contain Kevlar in their base composition. 22,38 Roughness and hardness presented the lowest hardness in relation to the other laminated composites. These results are attributed to the fact that A-HFRP, by absorbing a greater amount of water, presented a more ductile surface, due to the superficial alteration and plasticization of the matrix with respect to the behavior of U-GFRP which presents a smoother and more ductile surface as it is not subjected to an aging process.…”
Section: Moisture Absorption Behaviormentioning
confidence: 87%
“…Hussian Siyah et al 21 in studies on the mechanical and adhesion characteristics of fiberglass/Kevlar hybrid composites in different proportions of epoxy resin, found that the proportion of resin and hardener has a profound importance on both mechanical and physical properties. In the results reported by Dávila et al 22 in the microstructural characterization of materials composite of glass fibers, carbon and Kevlar, obtained by the vacuum-assisted resin infusion process, showed minimal amounts of air inclusions (pores) and delamination. Kevlar fibers have been used as a fabric in laminated composite materials, but no studies have been reported where Kevlar fibers were used as surface reinforcement of laminated composites in erosive wear applications.…”
This study presents the effect caused by the saline environment (artificial seawater) on the physical and tribological properties of laminated composite materials reinforced with aramid fibers when they are subjected to erosive wear by sand particles. Composite materials made by epoxy resin and reinforced with glass fiber, carbon fiber and hybrid fiber (aramid with carbon) were studied. The laminates were superficially reinforced with layers of Kevlar fiber and prepared by the vacuum-assisted resin infusion process. The samples were subjected to a seawater accelerated aging process at 70°C for 1122 h. To reproduce erosive wear conditions of marine structural components, sea sand was used as solid particle under conditions of 4.5 bar of pressure, impact speed of 4.7 m/s and impact angle of 90°. The results showed that aged materials absorb more impact energy with respect to unaged counterparts, causing less material loss and a less depth in the wear track. The information generated by this research work may serve for the design and durability analysis of marine structures such as tidal turbine blades.
“…37 HFRP samples are more hydrophilic (due to the presence of Kevlar), than CFRP (slightly hydrophilic) and GFRP that does not contain Kevlar in their base composition. 22,38 Figure 6.Moisture absorption curves of CFRP, HFRP and GFRP, subjected to the aging process in saline water, at 70°C and a time of 1122 h (51 days).…”
Section: Resultsmentioning
confidence: 99%
“…37 HFRP samples are more hydrophilic (due to the presence of Kevlar), than CFRP (slightly hydrophilic) and GFRP that does not contain Kevlar in their base composition. 22,38 Roughness and hardness presented the lowest hardness in relation to the other laminated composites. These results are attributed to the fact that A-HFRP, by absorbing a greater amount of water, presented a more ductile surface, due to the superficial alteration and plasticization of the matrix with respect to the behavior of U-GFRP which presents a smoother and more ductile surface as it is not subjected to an aging process.…”
Section: Moisture Absorption Behaviormentioning
confidence: 87%
“…Hussian Siyah et al 21 in studies on the mechanical and adhesion characteristics of fiberglass/Kevlar hybrid composites in different proportions of epoxy resin, found that the proportion of resin and hardener has a profound importance on both mechanical and physical properties. In the results reported by Dávila et al 22 in the microstructural characterization of materials composite of glass fibers, carbon and Kevlar, obtained by the vacuum-assisted resin infusion process, showed minimal amounts of air inclusions (pores) and delamination. Kevlar fibers have been used as a fabric in laminated composite materials, but no studies have been reported where Kevlar fibers were used as surface reinforcement of laminated composites in erosive wear applications.…”
This study presents the effect caused by the saline environment (artificial seawater) on the physical and tribological properties of laminated composite materials reinforced with aramid fibers when they are subjected to erosive wear by sand particles. Composite materials made by epoxy resin and reinforced with glass fiber, carbon fiber and hybrid fiber (aramid with carbon) were studied. The laminates were superficially reinforced with layers of Kevlar fiber and prepared by the vacuum-assisted resin infusion process. The samples were subjected to a seawater accelerated aging process at 70°C for 1122 h. To reproduce erosive wear conditions of marine structural components, sea sand was used as solid particle under conditions of 4.5 bar of pressure, impact speed of 4.7 m/s and impact angle of 90°. The results showed that aged materials absorb more impact energy with respect to unaged counterparts, causing less material loss and a less depth in the wear track. The information generated by this research work may serve for the design and durability analysis of marine structures such as tidal turbine blades.
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