GF/PE 복합재료의 인장파괴거동에 관한 연구
A Study on the Tensile Fracture Behavior of Glass Fiber Polyethylene Composites
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초록
이 연구의 결과를 요약하면 다음과 같다. 1) GF/PE 복합재료의 온도의 변화에 따른 인장강도는 -50℃에서의 결과가 가장 높게 나타나고 -15℃, 실온 그리고 60℃의 순으로 낮게 나타났다. 2) GF/PE 복합재료의 파괴기구는 온도의 변화에 따라 매트릭스의 변형이 나타났으며 섬유의 풀아웃, 섬유와 매트릭스 사이의 디본딩을 관찰할 수 있었으며, 이와 같은 파괴기구과 종합적으로 상호작용한다고 생각된다.
Abstract
Many of researches regarding mechanical properties of composite materials are associated with humid environment and temperature. Especially the temperature is a very important factor influencing the design of thermoplastic composites. However, the effect of temperature on impact behavior of reinforced composites have not yet been fully explored. An approach which predicts critical fracture toughness G/sub IC/ was performed by the impact test in this work. The main goal of this work is to study the effect of temperature and span of specimen supports on the results of Charpy impact test for GF/PE composite. The critical fracture energy and failure mechanism of GF/PE composites were investigated in the temperature range of 60℃ to -50℃ by the Charpy impact test. The critical fracture energy showed the maximum at the ambient temperature, and it tended to decrease as the temperature increased or decreased from the ambient temperature. The major failure mechanisms are the fiber matrix debonding, the fiber pull-out and/or delamination and the matrix deformation.