Abstract
Mechanical property of CFRP decreased by water absorption. In this study, effects of water absorption and freezing on flexural creep property and fracture toughness of CFRP are investigated. Water absorption test was conducted at 90℃ for 24, 48 and 72 hours. After water absorption, the specimens were kept in the -15℃ environment for 24 hours. The dimension of the specimen increased due to water absorption. The increase rate of thickness in freezing was bigger than that of only water absorption environment. Cracks occurred in the interface during water absorption. The interfacial crack progressed when the freeze expansion occurred. Therefore, creep property and fracture toughness of CFRP decreased. In addition, it is thought that creep properties decreased due to the decrease of a glass transition point after water absorption.
