Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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A Study on Failure Mechanisms of Composite Tubes with Woven Fabric Carbon, Glass and Kevlar/epoxy Under Compressive Loadings

직조된 탄소, 유리 및 케블라 섬유 복합소재 튜브의 압축하중하에서 파손 메커니즘 분석 연구

  • 김정석 (한국철도기술연구원, 철도구조연구실) ;
  • 윤혁진 (한국철도기술연구원, 철도구조연구실) ;
  • 이호선 (한국철도기술연구원, 철도구조연구실) ;
  • 권태수 (한국철도기술연구원, 철도구조연구실)
  • Published : 2009.08.30
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Abstract

In this study, the failure modes and energy absorption characteristics of four different kinds of circular tubes made of carbon, glass, Kevlar and carbon-Kevlar hybrid fibres composites with epoxy resin have been evaluated. To achieve these goals, compressive tests were conducted for the tubes under 10mm/min loading speed. Based on the test results, the carbon/epoxy tube showed the best energy absorption capability, while carbon-Kevlar/epoxy tubes were worst. In the failure mode during crushing, both of the carbon/epoxy tubes and the glass/epoxy tubes were crushed by brittle fracturing mode. The Kevlar/epoxy tubes were collapsed by local buckling mode like steel, while the carbon-Kevlar hybrid tubes were collapsed by mixed mode of local buckling and lamina bending.

본 연구에서는 탄소, 유리, 케블라 및 탄소-케블라 하이브리드 섬유로 제작된 원형튜브를 이용하여 각 소재별 에너지 흡수특성과 파손메커니즘을 규명하였다. 이를 위해 각 튜브에 대한 10mm/min의 준정적 압축시험을 수행하였다. 시험결과 탄소섬유 튜브가 가장 에너지 흡수특성이 우수했으며 탄소-케블라 하이브리드 섬유 튜브가 가장 낮은 에너지 흡수율을 보였다. 또한, 각 소재별 에너지 흡수메커니즘을 분석한 결과 탄소 및 유리섬유튜브는 취성파괴 모드로 압축되었다. 또한, 케블라 섬유 튜브는 국부좌굴에 의한 접힘모드가 지배적이고, 탄소와 케블라 하이브리드 섬유 튜브의 경우 단층굽힘과 국부좌굴모드가 혼합되어 나타났다.

Keywords

References

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