Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
권호 표지

Evaluation of Mode I Interlaminar Fracture Toughness for Carbon Fabric/Expocy Composite for Tilting Train Carbody

틸팅열차 차체용 탄소섬유직물/에폭시 복합재의 모우드 I 층간파괴인성 평가

  • 허광수 (금오공과대학교 기계공학부) ;
  • 김정석 (한국철도기술연구원) ;
  • 윤성호 (금오공과대학교 기계공학부)
  • Published : 2005.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

Model I interlaminar fracture behaviors of the carbon/epoxy composite, one of the candidate composites for a tilting train carbody, were investigate by the use of DCB(Double cantilever beam) specimens. These specimens were made of CF3327 plain woven fabric with epoxy resin, and an artificial starter delamination was fabricated by inserting Teflon film with the thickness of $12.5{\mu}m$ of $25.0{\mu}m$ at the one end of the specimen. Mode I interlaminar fracture toughness was evaluated for the specimens with the different thickness of an inserter. Also delamination propagating behaviors and interlaminar fracture surface were examined through an ooptical travelling scope and a scanning electron microscope. We found that abruptly unstable crack propagation called as stick-slip phenomena was observed. In addition, interlaminar fracture behaviors were affected on the location and the morphology of a crack tip as well as an interface region.

Keywords

References

  1. Shin, K.B., Yoo, W.H., and Mun, H.S. (2002). 'The Application of Composite Materials in the Railway Vehicle System,' Journal of The Korean Society for Composite Materials, Vol.15, No.5, pp.66-71
  2. Shin, K.B., Koo, D.H., and Hahn, S.H. (2004). 'The Development Project of Korean Tilting Train Express with Maximum Design Speed of 200km/h,' Journal of The Korean Society for Composite Materials, Vol.17, No.3, pp.62-65
  3. Margolis, J.M. (1986). Advanced Thermoset Composites: Industrial and Commercial Applications, Van Nostrand Reinhold Company, New York
  4. Bae, D.W., et. al. (2004). Development of Carbody Shape/Interior and Facilities Technology, Final Report, Fiber Glass ompany
  5. Goertzen, W.K. and Kessler, M.R. (2004). 'Thermal Expansion of Woven Carbon Fiber Composites Used in Pipe Overwrap Repair Systems,' Proc. of the Eleventh Annual Int. Conf. on Composites Engineering, Hilton Head Island, SC, USA
  6. Kotaki, M. and Hamada, H. (1997). 'Effect of Interfacial Properties and Weave Structure on Mode I Interlaminar Fracture Behaviour of Glass Satin Woven Fabric Composites,' Composites Part A, Vol.28A, pp.257-266
  7. Russel, A.J. and Street, K.N. (1982). 'Factors Affecting the Interlaminar Fracture Energy of Graphite/Epoxy Laminates,' Proc. of the Fourth Int. Conf. on Composite Materials, Tokyo, Japan
  8. Chai, H. (1984). 'The Characterization of Mode I Delamination Failure in Non-Woven Multidirectional Laminates,' Composites, Vol.15, No.3, pp.277-290 https://doi.org/10.1016/0010-4361(84)90708-0
  9. Todo, M. and P-YB. Jar, P-YB. (1998). 'Study of Mode I Interlaminar Crack Growth of Fiber Reinforced Composites Using DCB Specimens,' Composite Science and Technology, Vol.58, pp.105-118
  10. ASTM D5528-94a (2000). Standard Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites, American Society for Testing Materials, Vol.15.03
  11. ISO 15024 (2001). Fiber-Reinforced Plastic Composites - Delamination of Mode I Interlaminar Fracture Toughness, GIC, for Unidirectionally Reinforced Materials
  12. Alif, N., Carlsson, L.A., and Gillespie, J.W. Jr., (1997). 'Mode I, Mode II, and Mixed Mode Interlaminar Fracture of Woven Fabric Carbon/Epoxy,' Composite Materials: Testing and Design, Thirteenth Volume, ASTM STP 1242, pp.82-106
  13. Broek, D. (1983). Elementary Engineering Fracture Mechanics, Martinus Nijhoff Publishers, The Hague
  14. Hashemi, S., Kinloch, A.J., and Williams, J.G. (1989). 'Corrections Needed in Double Cantilever Beam Tests for Assessing the Interlaminar Failure of Fiber-composites,' Journal of Materials Science Letter, Vol.8, pp.125-129 https://doi.org/10.1007/BF00730701
  15. Williams, J.G. (1989). 'The Fracture Mechanics of Delamination Tests,' Journal of Strain Analysis, Vol.24, No.4, pp.207-214 https://doi.org/10.1243/03093247V244207
  16. Yoon, S.H., et. al. (2005). 'Evaluation of Mode II Interlaminar Fracture Toughness for Carbon Fabric/Epoxy Composites for Tilting Train Carbody,' Journal of The Korean Society for Railway, Vol.8, No.2, pp.195-201