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J. Ocean Eng. Technol. 1996;10(4):75-83.    

Effect of moisture on interlaminar fracture toughness of CFRP composites
CFRP 복합재료의 층간파괴인성치에 미치는 수분의 영향
김형진,김종훈,고성위,김엄기
경상대학교 기관공학과,부경대학교 제어계측공학과,부경대학교 제어계측공학과,공주대학교 기계공학과
© 1996 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Interlaminar Fracture Toughness, Environmental, DCB Specimen, ENF Specimen, Critical Energy Release Rate, Fractrue Mechanisms
핵심용어: 층간파괴인성, 환경효과, DCB 시험편, ENF 시험편, 임계에너지 방출률, 파괴기구
Abstract
Polymeric composites can be subjected to a wide variety of environmemtal conditions in practical use. One of most important conditions to be considered in the stuctural design using such materials is the miisture envirnment. Thus the moisture effect on interlaminar fracture toughness $G_IC$ and $G_IIC$ of CFRP(carbon fiber reinforced plastic) composed of carbon fibers and epoxy resin is studied in this paper. Specimens were first processed in 25, 50, $80^{circ}C$ flesh water and $25^{circ}C$ sea water for various periods of time. After that, the water absorption and fracture toughness tests were performed under laboratory atmosphere. As result, the specimen processed in $80^{circ}C$ flesh water indicates the highest misture absorbing capability, the second in $50^{circ}C$ flesh water, the third in $25^{circ}C$ sea water, and the specimen in $25^{circ}C$ flesh water does the lowest. The interlaminar fracture toughness $G_IC$ increases, approaches to the maximum, and decreases as the immersion time increases. In case of interlaminar $G_IIC$, the value of the specimen processed in $80^{circ}C$ flesh water turns out to be higher than others. In addition, the scanning electron micrographs(SEM) of fracture surfaces were also examined in order to explain the mechanism of fracture.


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