Abstract
In this study, water absorption and flexural strength properties of carbon fiber reinforced plastics (CFRP) were examined. The properties of epoxy resin were also examined. Mass gains were measured after immersion in a distilled water under RT(Room Temperature), 50℃, 70℃ and 90℃ conditions. Static flexural tests were conducted after immersion for 180 days. As a result, following conclusions were obtained. Mass gain of CFRP and epoxy resin increased with an increase of water temperature. The reason of this phenomenon was the cracks occurred in CFRP and epoxy resin when CFRP and epoxy resin were immersed in a distilled water at 90℃. The flexural strength of CFRP and epoxy resin did not decrease over 60.8%, 78.5% in a distilled water for 180 days. When CFRP and epoxy resin were immersed in a distilled water over 120days at high temperature, strength did not recover over 43.8%, 70.8% by drying. The reasons were the cracks occurred in matrix.
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