Abstract
The effect of moisture absorption on the static and fatigue properties for plain-woven CF/epoxy composites (plain-woven CFRP) was examined when the humidity condition changed at the following stages; mixing of epoxy resin with hardener, laminating of carbon fabrics with epoxy resin, storage before testing and static and fatigue testing. At each stage, the materials were exposed to either completely dry nitrogen gas to isolate the materials from moisture or the laboratory atmosphere. The experimental results showed that the tensile strength and fatigue life of plain-woven CFRP were significantly improved when the materials were protected from moisture absorption at the mixing and laminating stages. This protection improved the resistance of crack growth and interfacial shearing strength at the fiber/matrix interface. Such improvement contributes to the enhancement of the tensile strength and fatigue life of plain-woven CFRP.
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