환경인자에 노출된 탄소섬유/에폭시 복합재의 장기 층간전단강도 예측 = Prediction of Long-Term Interlaminar Shear Strength of Carbon Fiber/Epoxy Composites Exposed to Environmental Factors

다국어 초록 (Multilingual Abstract)

The purpose of this study was to predict the long-term performance using the interlaminar shear strength of carbon fiber/epoxy composites exposed to environmental factors. Interlaminar shear specimens, manufactured by the filament winding method, were exposed to the conditions of drying at 50℃, 70℃, and 100℃ and of immersion at 25℃, 50℃, and 70℃ for up to 3000 hours, respectively. According to the results, the interlaminar shear strength did not vary significantly with the exposure time for the drying at 50℃ and 70℃, but it increased somewhat for the drying at 100℃ due to the post curing as the exposure time increased. The interlaminar shear strength of the specimens exposed to the immersion at 25℃ did not change significantly at the beginning of exposure, but it decreased with the exposure time and the degree of decrease increased as the environmental temperature increased. The linear regression equations for the environmental temperatures were obtained from the interlaminar shear strength of the specimens exposed to the immersion for up to 3000 hours. Using these linear regression equations, the interlaminar shear strength was estimated to be within 5.5% of the measured value at 25℃ and 50℃, and 2.3% of the measured value at 70℃. Therefore, the proposed performance prediction procedures can predict well the long-term interlaminar shear strength of carbon fiber/epoxy composites exposed to environmental factors.

참고문헌 (Reference)

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