Abstract:Using pre-stressed carbon fibre reinforced polymer/plastic (CFRP) to strengthen bridge structures is currently considered a promising technology and the durability of the structure is closely related to the material property. CFRP have good corrosion resistance, but they also experience different degrees of swelling, corrosion and hydrolysis in water immersion environments. Stress accelerates this effect and leads to deterioration of the mechanical properties of the materials. This work aims to investigate the… Show more
“…36 In humid conditions, water acts as an external agent that is absorbed by the Kevlar fibers, in the case of moisture absorption, due to the existence of matrix cavities, the ionic compounds of NaCl enter to the matrix, and when the matrix dries, the ions crystallize after the solution evaporates, causing the volume of the matrix to expand. 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 …”
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.
“…36 In humid conditions, water acts as an external agent that is absorbed by the Kevlar fibers, in the case of moisture absorption, due to the existence of matrix cavities, the ionic compounds of NaCl enter to the matrix, and when the matrix dries, the ions crystallize after the solution evaporates, causing the volume of the matrix to expand. 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 …”
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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