무게가 상이한 탄소부직포가 삽입된 CFRP적층판의 층간파괴인성
Interlaminar Fracture Toughness of CFRP Laminates with Carbon Non-Woven Tissue Having Different Weights
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초록
탄소부직포(CNWT)의 삽입에 의해 개선되는 층간파괴특성을 활용하기 위하여, CNWT의 무게에 대한 층간파괴인성값(GIC 및 GIIC)의 변화를 비교함으로써 CFRP적층판에 삽입되는 적절한 CNWT의 무게를 제안하고자 실험적으로 검토하였다. Mode I 및 Mode II 층간파괴인성값(GIC 및 GIIC)은 DCB실험과 ENF실험에 의하여 얻어졌으며, 6종류(8g/m2, 10g/m2, 12g/m2, 16g/m2, 20g/m2 및 24g/m2)의 CNWT가 각각 삽입된 6종류의 시험편들이 준비되었다. 6종류의 CNWT가 삽입된 시험편들에 대하여, 평균적인 GIC는 거의 비슷하였고 CFRP시험편과 비교하여 약간 감소하였다. 무게가 다른 CNWT가 삽입된 시험편들의 Mode II 층간파괴인성값(GIIC) 역시 서로 비슷하였으나, CFRP 시험편의 Mode II 층간파괴 인성값에 비해서는 약 2배 이상 크게 증가하였다. 탄소부직포의 무게에 따른 층간파괴인성값(GIC 및 GIIC)들 사이에는 각별한 상관관계가 보이지 않았으며, CNWT의 삽입에 의해 개선되는 층간파괴특성을 활용하기 위해서는 6종류의 CNWT 중에 경제적이고 무게가 가벼운 8g/m2의 CNWT를 선택하는 것이 바람직하다고 제안한다.
Abstract
For the practical use of improved interlaminar fracture toughness by interleaving carbon non-woven tissue (CNWT), intelaminar fracture toughnesses of CFRP laminates with CNWT having different weights were experimentally investigated. A suitable weight of interleaved CNWT in CFRP laminates was discussed with Mode I and Mode II tests. Mode I and Mode II interlaminar fracture toughnesses (GIC and GIIC) were obtained by DCB and ENF tests. Six kinds of specimens with CNWT were prepared. The weights of CNWT per square meter for six types of specimens are 8g/m2, 10g/m2, 12g/m2, 16g/m2, 20g/m2, and 24g/m2, respectively. The mean GIC and GIIC values of six kinds of specimens were not substantially different from one another. Compared with the CFRP specimen, the mean GIC values of six kinds of specimens were slightly decreased. But the mean GIIC values increased tremendously at least twice by interleaving CNWT. It seems that there is no interrelationship between the interlaminar fracture toughnesses (GIC and GIIC) and the interleaving CNWT weights. Consequently, it would be desirable to use the CNWT of 8g/m2 among the six kinds of CNWTs to take advantage of the interlaminar fracture toughness improved by interleaving CNWT, because the CNWT of 8g/m2 is a lightweight and low-priced material.
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