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열팽창 치공구를 이용한 복합재료의 성형 및 압축압력 연구
Consolidation Pressure Control in Thermally-Expandable Rubber-Tool Process for Polymeric Composite Materials
HWAHAK KONGHAK, August 1998, 36(4), 536-542(7), NONE
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Abstract
본 연구에서는 복합재료의 가공에 있어서 압축(consolidation)또는 함침(infusion)에 필요한 압력을 열팽창치공구를 이용하여 생성시키는 열팽창치공구 공정을 연구하였다. 항공용 복합재료의 가공에 적합한 실리콘 계통의 고무치공구를 선정하였고 이 소재에 대하여 온도가 상승함에 따라 열팽창으로 생성되는 압력을 예측하기 위하여 열팽창계수와 effective bulk modulus를 측정하였다. 또한 1-D radial constrained expansion계를 설정하여 온도에 따른 압력형성을 실험적으로 측정하였고 이론과 비교하였다. 온도에 따른 압력생성을 예측하기 위한 모델링을 통하여 온도에 따른 압력증가를 열팽창 계수와 bulk modulus의 함수로 나타낼 수 있었으며, 압력은 자유부피와 몰드 configuration에 따라 영향을 받는 것으로 확인되었으며 이에 대한 정량적인 예측도 가능하였다.
As a novel composite manufacturing process, the thermally-expandable rubber-tool process was investigated in order to obtain the enhanced laminate consolidation and resin infusion in both thermoplastic- and thermoset-based composite systems. A silicon-based rubber tool was chosen for the primary applications in aircraft environment. The thermal expansion coefficient and bulk modulus of the rubber tool were measured by a 1-D radial expansion system and subsequently used to predict the pressure generated by the expanding rubber tool as a function of temperature. The generated pressure was expressed by the thermo-physical properties and as a function of processing temperature. Finally, the mold configurations including the relative gap and rubber tool volumes influenced the characteristic features of the pressure build-up in rubber-tool based thermal processing.
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