Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Experimental Testing of Curved Aluminum Honeycomb/CFRP Sandwich Panels

곡면형상의 알루미늄 하니콤/CFRP 샌드위치 패널에 관한 실험적 연구

  • Roy, Rene (Department of Aerospace and System Engineering, Research Center for Aircraft Parts Technology, Gyeongsang National University) ;
  • Park, Yong-Bin (Department of Aerospace and System Engineering, Research Center for Aircraft Parts Technology, Gyeongsang National University) ;
  • Kweon, Jin-Hwe (Department of Aerospace and System Engineering, Gyeongsang National University) ;
  • Choi, Jin-Ho (School of Mechanical Engineering, Gyeongsang National University)
  • Received : 2012.12.05
  • Accepted : 2013.03.18
  • Published : 2013.04.30
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Abstract

This paper presents the fabrication and 3-point flexion testing of carbon fiber reinforced polymer (CFRP) composite face/aluminum honeycomb core sandwich panels. Specimen sandwich panels were fabricated with three honeycomb types (3.18 mm, 4.76 mm, and 6.35 mm cell size) and three panel radii (flat, r = 1.6 m, r = 1.3 m). The curved sandwiches were fabricated normally with the core in the W-direction. The tensile mechanical properties of the CFRP $2{\times}2$ twill fabric face laminate were evaluated (modulus, strength, Poisson's ratio). The measured values are comparable to other CFRP fabric laminates. The flat sandwich 3-point flexion test core shear strength results were 11-30% lower than the manufacturer published data; the test set-up used may be the cause. With a limited sample size, the 1.3 meter panel curvature appeared to cause a 0.8-3.8% reduction in ultimate core shear strength compared to a flat panel.

본 논문에서는 탄소섬유강화플라스틱 면재와 알루미늄 샌드위치 심재를 가지는 복합재 샌드위치의 제조와 3절점 굽힘 실험에 대해 연구하였다. 시편은 3가지 하니컴 종류(3.18 mm, 4.76 mm, 6.35 mm의 셀 크기)와 3가지 곡률 반지름(평판, r = 1.6 m, r = 1.3 m)을 가지도록 제작하였다. 샌드위치 곡률의 기준은 W-방향을 기준으로 제작 하였다. CFRP $2{\times}2$ 트윌의 인장에서 기계적 물성치(탄성계수, 강도, 푸아송 비)를 측정하여 그 값들을 다른 CFRP 섬유 적층판의 값과 비교하였다. 실험결과 평판 샌드위치 패널의 3절점 굽힘 실험에서 심재의 전단강도는 공개된 데이터에 비해 11-30% 낮게 나왔다. 제한된 시편 크기에서 1.3미터 곡률을 가지는 패널은 평판 패널에 비해 심재의 극한 전단강도가 0.8-3.8% 감소한 것으로 나타났다.

Keywords

References

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