Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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Compressive Strength Restoration Evaluation of Sandwich Composite Laminates Repaired by Scarf Method

패치 보수된 샌드위치 복합재 적층판의 압축시 강도회복 평가

  • 김정석 (한국철도기술연구원, 철도구조연구실) ;
  • 윤혁진 (한국철도기술연구원, 철도구조연구실) ;
  • 김승철 (한국철도기술연구원, 철도구조연구실) ;
  • 서승일 (한국철도기술연구원)
  • Published : 2009.02.28
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Abstract

This study is for the evaluation of compressive strength restoration of sandwich composite laminates with adhesively bonded scarf patches. It was used in this study that the sandwich composite laminate with an aluminum honeycomb core and CF1263 woven fabric carbon/epoxy faces was applied to the car body structure for Korean tiling train. In this study, it was damaged by low velocity impact and repaired using scarf repair method. Then, the compressive strength restoration of assessed by compressive after impact (CAI) test. From the test, it could be known that the compressive strength was restored up to 72% by only scarf repair method and 91% applied by an extra ply over the undamaged one.

본 연구에서는 스카프 패취가 접착된 복합소재 샌드위치 적층판의 압축강도 회복특성을 평가하였다. 본 연구에서는 알루미늄 허니콤 심재와 CF1263 직조된 탄소/에폭시 면재를 갖는 틸팅열차차체에 적용된 샌드위치 시험편이 이용되었다. 샌드위치 시험편은 저속충격에 의해 손상을 가하고, 스카프 보수기법에 의해 보수되었다. 보수 후 CAI시험을 통해 충격 후 압축강도를 평가하여 강도회복정도를 정량적으로 규명하였다. 본 시험으로부터 단지 스카프 보수를 적용한 경우 약 72%정도의 강도를 회복하였고, 추가보수층 한층을 추가했을 경우 약 91%까지 강도를 회복시킬 수 있음을 확인하였다.

Keywords

References

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