Design & Manufacturing

Korean Society of Die & Mold Engineering (한국금형공학회)
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A study on slit opening and flexural strength of carbon/epoxy prepregs with slit patterns

슬릿 패턴 형상에 따른 Carbon/Epoxy 프리프레그 성형물의 굽힘 강도 특성 및 슬릿 변형량 분석

  • Lee, Sung-Gyun (Department of Product Design & Manufacturing Engineering, Seoul National University of Science&Technology) ;
  • Won, Si-Tae (Department of Product Design & Manufacturing Engineering, Seoul National University of Science&Technology) ;
  • Yoon, Gil-Sang (Korea Institute of Industrial Technology, Molds&Dies Technology R&D Group) ;
  • Kim, Yong-Dae (Korea Institute of Industrial Technology, Molds&Dies Technology R&D Group) ;
  • Kim, Dong-Earn (Department of Product Design & Manufacturing Engineering, Seoul National University of Science&Technology)
  • 이성균 (서울과학기술대학교 대학원 제품설계금형공학과) ;
  • 원시태 (서울과학기술대학교 대학원 제품설계금형공학과) ;
  • 윤길상 (한국생산기술연구원 금형기술그룹) ;
  • 김용대 (한국생산기술연구원 금형기술그룹) ;
  • 김동언 (서울과학기술대학교 대학원 제품설계금형공학과)
  • Received : 2016.05.10
  • Accepted : 2016.06.03
  • Published : 2016.06.07
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Abstract

Designed patterns of slit are introduced to the uni-directional (UD) prepreg in order to enhance the formability of the carbon/epoxy composites without wrinkling and laddering. Three different types of the slit alignment along the thickness direction are applied to analyse the deformation behavior during the compression moulding process of laminates. Degrees of the slit open and the mechanical strength are evaluated based on the level of the compaction pressure in the course of forming process. Results have shown that the mechanical strength of laminates having slits could attain at least 80% of the conventional ones without slits. However, further studies are required to identify the direct relevance of the slit alignment in laminate to the mechanical properties.

Keywords

References

  1. IRS Global, "자동차 경량화 관련 소재 및 부품 개발동향과 국내외 참여업체 사업전략", pp. 46-89, 2013.
  2. J. Njuguna, "Lightweight Composite Structures in Transport", Woodhead Publishing, 2016.
  3. G. Davies, "Materials for Automobile Bodies", Butterworth-Heinemann, 2012.
  4. P. Feraboil, E. Peitso, T. Cleveland, "Notched behavior of prepreg-based discontinuous carbon fiber/epoxy system", Composite Part A, vol.40, pp. 289-299, 2009. https://doi.org/10.1016/j.compositesa.2008.12.012
  5. J. Wulfsberg, A. Herrmann, G. Ziegmann, G. Lonsdorfer, N. Stob, M. Fette, "Combination of Carbon fibre sheet moulding compound and prepreg compression moulding in aerospace industry", J. of Procedia Eng., vol.81, pp. 1601-1607, 2014. https://doi.org/10.1016/j.proeng.2014.10.197
  6. 전성식, 이대길, 김주학 "섬유부피분율에 따른 복합재료의 충격에너지 특성", 대한기계학회 1998년도 춘계학술대회 논문집, pp. 78-83, 1998.
  7. John J. Gangloff Jr., S. Sinha, Suresh G. Advani, "A model for tow impregnation and consolidation for partially impregnated thermoset prepreg", Int. SAMPE Technical Conference, 2011.
  8. 서안나, 이종현, "열기계적 분석법으로 측정된 레진 포뮬레이션의 경화 수축 특성", Korean J. Met. Mater, Vol.50, No.9 , pp. 629-636, 2012. https://doi.org/10.3365/KJMM.2012.50.9.629
  9. 기술표준원, "KS M ISO 14130 : 섬유 강화 플라스틱 복합 재료 - 단봉법에 의한 겉보기 층간 전단 강도의 측정", 2012.
  10. Yu Uriya, Jun Yanggimoto, "Erichsen cupping test on thermosetting CFRP sheets", Int. J. of Mater. Form, 2016.
  11. P. Harrison, R.Gomes, N.Curado-Correia, "Press forming a 0/90 cross-ply advanced thermoplastic composite using the double-dome benchmark geometry", Composite Part A, vol.54 pp. 56-69, 2013. https://doi.org/10.1016/j.compositesa.2013.06.014