Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Prediction of Surface Crack Growth Considering the Wheel Load Increment Due to Rail Defect

레일손상에 의한 윤중증가를 고려한 표면균열 성장예측

  • Jun, Hyun-Kyu (R&D Strategy Division, Korea Railroad Research Institute) ;
  • Choi, Jin-Yu (R&D Strategy Division, Korea Railroad Research Institute) ;
  • Na, Sung-Hoon (Audit & Inspection Division, Korea Railroad Research Institute) ;
  • You, Won-Hee (High Speed Railroad Interface Research Division, KRRI)
  • 전현규 (한국철도기술연구원 기술전략실) ;
  • 최진유 (한국철도기술연구원 기술전략실) ;
  • 나성훈 (한국철도기술연구원 감사실) ;
  • 유원희 (한국철도기술연구원 고속철도인터페이스연구실)
  • Received : 2011.04.26
  • Accepted : 2011.06.15
  • Published : 2011.09.01
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Abstract

Prediction of a minimum crack size for growth, which is defined as a crack size that grows fast enough to keep ahead of its removal by contact wear and periodic grinding, is the most demanding work to prevent rail from fatigue failure and develop cost effective railway maintenance strategy In this study, we investigated the wheel load increment due to a rail defect during a train ran over it, and its effect on the minimum crack size for growth. For this purpose, we developed simulation software based on the Fletcher and Kapoor's "2.5D" model and measured wheel load increment during a train passed over a defect. A maximum contact pressure and contact patch size were calculated by 3D FEM and crack growth analyses were performed by varying two of dominant contact contributors; surface friction coefficient(0.1, 0.2, 0.3 and 0.4) and crack aspect ratio. The minimum crack sizes for growth were calculated from 0.29 to 1.44mm depending on the contact conditions. They were decreasing with increasing surface friction coefficient and decreasing with crack aspect ratio(a/b).

Keywords

References

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