Influence of Layer Thickness on the Mechanical Properties in the Laminated Composites

적층형 복합재료에서 Unit Ply의 두께가 기계적 성질에 미치는 영향

  • 문창권 (부산수산대학교 재료공학과)
  • Published : 1995.12.01

Abstract

This study has been investigated the Influence of layer thickness on the mechanical properties of cross laminated carbon fiber/epoxy composites. And also the difference of mechanical properties between cross laminated composites of unidirectional prepreg and fabric prepreg has been investigated. Experimental results are showed that the Interlamina Shear Strength(ILSS) of cross laminated carbon fiber/epoxy composites decreased with increasing thickness of unit ply and the decree of delamination in the laminated composites increased as ILSS decreased. Fracture toughness and impact values were found to increase as delamination occurs to some extent in the laminated composites. It Is also shown thats mechanical properties of cross laminates from unidirectional prepreg were better than those of cross laminates from fabric prepreg.

탄소섬유와 epoxy 수지의 prepreg로 성형된 Cross형 적층판 복합재료에서 unfit ply의 두께가 복합재료의 기계적 성질에 미치는 영향과, unidirectional prepreg 및 fabric prepreg로된 적층판의 기계적 성질의 차이를 비교 검토하였다. 그 결과 unit ply의 두께가 두꺼울수록 면내전단강도는 작아졌으며, 면내전단강도가 작아 질수록 층간박리 현상이 현저하게 나타났다. 또 적당한 층간박리의 발생은 파괴인성치와 층격치를 증가시키지만 심한 층간박리는 오히려 그 값들을 감소시켰다. 그리고 unidirectional prepreg로 성형된 적층판이 fabric prepreg로 성형된 적층판보다 인장강도, 파괴인성치, 파괴일 및 충격치 등의 기계적 성질이 우수했다.

Keywords

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