열가소성 탄소섬유 강화 복합소재의 계면 결합력이 고속 압축 거동에 미치는 영향에 관한 연구
Effect of Interfacial Bonding on the High Strain Rate Compression Behavior of the Carbon Fiber Reinforced Thermoplastic Composites
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초록
본 연구는 탄소섬유 강화 열가소성 복합재의 고속 변형률 조건에서 계면 결합력과 기계적 성능을 분석하였다. 분자동역학 시뮬레이션을 통해 탄소섬유와 고분자 수지 간의 계면 특성을 평가하였으며, 이를 바탕으로 섬유 부피분율과 수지 종류에 따른 층간 전단 강도 및 고속 압축 거동을 비교하였다. 연구 결과, PA66 기반 복합재는 PA6 기반 복합재보다 더 높은 계면 결합력을 나타냈으며, 이는 복합재의 기계적 강도에 기여하는 것으로 확인되었다. 또한, split-Hopkinson pressure bar를 이용한 고속 압축 시험에서 계면 결합력이 향상된 복합재는 응력 분산이 효과적으로 이루어져 우수한 파괴 저항성을 나타냈다.
Abstract
This study investigates the interfacial bonding and mechanical performance of carbon fiber reinforced thermoplastic composites under high strain rate conditions. The interfacial properties between carbon fibers and polymers were analyzed using molecular dynamics simulations. The study focused on the effect of fiber volume fraction and polymer type on the interlaminar shear strength and high strain rate compression behavior of CFRTP materials. The results indicate that higher interfacial bonding properties enhance the mechanical strength. Additionally, the Split Hopkinson pressure bar test result was confirmed to improve stress distribution under dynamic compression because of interfacial bonding. The increase of interfacial bonding properties contributes to superior fracture resistance.
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