Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on Improving the Fatigue Life for a Woven Glass Fabric/Epoxy Laminate Composite Applied to Railway Vehicles

철도차량용 직물 유리섬유/에폭시 적층 복합재의 피로수명 향상 방안 연구

  • Ko, Hee-Young (School of Mechanical Engineering, Hanbat Nat'l Univ.) ;
  • Shin, Kwang-Bok (School of Mechanical Engineering, Hanbat Nat'l Univ.) ;
  • Kim, Jung-Seok (Division of Railroad Structure Research, Korea Railway Research Institute)
  • 고희영 (한밭대학교 기계설계공학과) ;
  • 신광복 (한밭대학교 기계설계공학과) ;
  • 김정석 (한국철도기술연구원 철도구조연구실)
  • Published : 2010.02.01
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Abstract

In this study, the fatigue characteristics and life of a woven glass fabric/epoxy laminate composite applied to railway vehicles was evaluated. The fatigue test was conducted using a tension-tension load with a stress ratio R of 0.1 and frequency of 5 Hz. Two types of woven glass fabric/epoxy laminate composite was used in the fatigue test: with and without carbon/epoxy ply reinforcement. In addition, the fatigue life of the woven glass fabric/epoxy laminate composite was compared with that of aluminum 6005, which is used in the car body and underframe structures of railway vehicles. The test results showed that the failure strength and life of the woven glass fabric/epoxy laminate composite reinforced with three carbon/epoxy plies had a remarkable improvement compared with that of the bare specimen without reinforcement.

본 연구는 철도차량에 적용되는 직물 유리섬유/에폭시 적층 복합재의 피로특성 및 피로수명에 대해 평가하였다. 이때, 피로시험은 0.1의 응력비(R)와 5Hz의 주파수에서 인장-인장 하중 조건이 고려되었으며, 시험편은 카본/에폭시 플라이가 보강된 시험편과 보강되지 않은 시험편 두 가지 타입을 고려하였다. 또한, 직물 유리섬유/에폭시 적층 복합재의 피로수명을 평가하기 위해 철도차량 차체와 언더프레임에 주로 사용되는 알루미늄 6005와 비교하였다. 본 연구를 통하여 3장의 카본/에폭시 플라이가 보강된 직물 유리섬유/에폭시 적층 복합재 시험편이 보강되지 않은 기본 시험편보다 피로강도 및 피로수명이 크게 향상됨을 확인하였다.

Keywords

References

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