탄소섬유/에폭시수지 복합재료의 파괴에너지에 미치는 pH, strain rate 및 섬유부피분율의 영향을 연구하였다. pH 2-12 범위에서 strain rate를 2.37×10^(－3) sec^(－1)부터 23.67×10^(－3) sec^(－1)까지 변화를 시켰으며, 섬유부피분율은 0∼0.09이었다. Three point bending 시험에 의해 시편을 파단시킨 후 섬유의 debond된 길이와 pull-out된 길이를 ZPM 법에 의해 구하였다. 본 계의 파괴에너지는 주로 pull-out energy가 가장 크게 나타나며, pH 7인 경우가 pH 2, 12인 경우보다 더 큰 값을 나타내었다. 그리고, strain rate 및 섬유부피분율이 증가함에 따라 파괴에너지가 증가하였다.

The effects of pH, strain rate and fiber volume fraction on the fracture energy of carbon fiber/epoxy composites were investigated. The range of strain rate was from 2.37×10^(－3) sec^(－1) to 23.67×10^(－3) sec^(－1), that of pH was 2 to 12 and fiber volume fraction was 0 to 0.09. Fracture of the specimen was carried out by three point bending test and fiber debonded length and pull-out length were measured by Zeiss projection microscope. Pull-out energy gave a major contribution to the fracture energy. The fracture energy at pH 7 was larger than those at pH 2 and pH 12. Fracture energy increased with the increase of strain rate and fiber volume fraction.