Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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Evaluation of Impact Damage and Residual Compression Strength after Impact of Glass/Epoxy Laminate Composites for Lightweight Bogie Frame induced by Ballast-Flying Phenomena

도상자갈 비산에 의한 경량 대차프레임 적용 유리/에폭시 적층 복합재의 충격손상 및 충격 후 잔류압축강도 평가

  • 구준성 (한밭대학교 기계설계공학과) ;
  • 신광복 (한밭대학교 기계공학과) ;
  • 김정석 (한국철도기술연구원 신교통연구본부)
  • Received : 2012.03.05
  • Accepted : 2012.04.09
  • Published : 2012.04.30
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Abstract

In order to evaluate the effect of structural degradation of a GFRP composite bogie frame due to ballast-flying phenomena, the impact test and residual compression test after impact was conducted for glass fiber/epoxy 4-harness satin woven laminate composites applied to skin part of a bogie frame. The impact test was performed using a instrumented impact testing system with energy levels of 5J, 10J, and 20J, and the impactor was designed to have various ballast shapes such as sphere, cube, and cone to consider the ballasted track environments. The residual compression strength was tested to evaluate the degradation of mechanical properties of impact-damaged laminate composites. The results showed that the damage area and the degradation of residual compressive strength after impact for laminate composites was increased with increase of impact energy for all ballast shapes, and was particularly most influenced by ballast shape of cone.

허본 논문에서는 도상자갈 비산에 의한 GFRP 복합재 대차프레임의 구조안전성을 평가하기 위해 대차프레임의 스킨부를 구성하는 유리섬유/에폭시 적층 복합재의 충격시험과 충격 후 잔류압축시험을 수행하였다. 충격시험은 충격시험장비를 사용하여 5J, 10J, 그리고 20J의 충격에너지에 대해 수행하였고, 선로상의 도상자갈 비산을 모사하기 위해 구형, 육면체형, 그리고 원뿔형의 충격체를 설계하여 충격시험을 수행하였다. 충격손상을 갖는 적층 복합재의 잔류압축강도를 평가하기 위해 충격 후 압축시험을 수행하여 충격에 의한 재료의 물성저하 여부를 판단하였다. 본 연구를 통하여 충격에너지가 증가함에 따라 적층 복합재의 충격손상영역과 압축강도저하가 증가하는 것을 확인하였으며, 원뿔형 형상의 도상자갈이 다른 형상에 비해 재료의 손상을 가중시키는 것을 확인하였다.

Keywords

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  1. Evaluation of structural integrity after ballast-flying impact damage of a GFRP lightweight bogie frame for railway vehicles vol.29, pp.6, 2015, https://doi.org/10.1007/s12206-015-0528-9