Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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Dynamic Property Evaluation of Four-Harness Satin Woven Glass/epoxy Composites for a Composite Bogie Frame

복합소재 대차프레임용 4매 주자직 유리섬유/에폭시 복합소재의 진동특성평가

  • Kim, Il Kyeom (New Transportation Systems Research Center, Korea Railroad Research Institute) ;
  • Kim, Jung Seok (New Transportation Systems Research Center, Korea Railroad Research Institute) ;
  • Seo, Sung Il (Emerging Transportation Technology Research Division Korea Railroad Research Institute) ;
  • Lee, Woo Geun (Railway System Engineering, University of Science and Technology)
  • Received : 2012.08.22
  • Accepted : 2012.09.17
  • Published : 2013.02.28
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Abstract

In this study, the natural frequency and damping ratio of a four-harness satin woven glass/epoxy composite material are evaluated by means of modal tests and a finite element analysis. To achieve this goal, glass/epoxy beam specimens with different lengths and thicknesses were manufactured via autoclave curing. In the test, the maximum damping ratio was found to occur at the lowest test frequency. As the test frequency increased, the damping ratio decreased exponentially to a critical value. After that value, the damping ratio increased gradually to the maximum test frequency.

본 연구에서는 복합소재 전동차용 대차프레임에 적용되는 4매 주자직 유리섬유/에폭시 복합소재에 대한 고유진동 특성과 주파수에 따른 감쇠특성을 평가하였다. 이를 위해 오토클레이브 성형을 통해 길이와 두께가 다른 유리섬유/에폭시 빔 시편을 제작하였다. 시험결과 감쇠비의 최대값은 최소 고유진동수에서 발생하였다. 또한, 주파수가 증가함에 따라감쇠비는 지수 함수적으로 임계치까지 감소하였다. 이후에는 주파수에 따라 증가하는 경향을 보였다.

Keywords

References

  1. J.S. Kim, H.J. Yoon (2011) Structural behaviors of a GFRP composite bogie frame for urban subway trains under critical load conditions, ICM11, Italy, June, pp. 5-9.
  2. J.S. Kim, H.J. Yoon, S.H. Lee, W.G. Lee, K.B. Shin (2011) Durability evaluation of the composite bogie frame under different shapes and loading conditions, ICCM18, Korea, August June, pp. 22-26.
  3. J.S. Kim, W.G. Lee (2012) Manufacturing and structural behavior evaluation of composite side beams using autoclave curing and resin transfer moulding method, International Journal of Precision Engineering Manufacturing, 13, pp. 723-730. https://doi.org/10.1007/s12541-012-0094-3
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  5. Roger M. Crane. (1989) Damping loss factor determination of glass and graphite epoxy laminated composites using vertically oriented cantilever beams, David Taylor Research Center.
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