Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Evaluation of Residual Stress for Thermal Damage of Railway Wheel Tread

차륜 답면의 열손상에 대한 잔류응력 평가

  • Kwon, Seok-Jin (Vehicle and Track Research Department, Korea Railroad Research Institute) ;
  • Seo, Jung-Won (Vehicle and Track Research Department, Korea Railroad Research Institute) ;
  • Lee, Dong-Hyung (Vehicle and Track Research Department, Korea Railroad Research Institute) ;
  • Ham, Young-Sam (Vehicle and Track Research Department, Korea Railroad Research Institute)
  • 권석진 (한국철도기술연구원 차륜궤도연구실) ;
  • 서정원 (한국철도기술연구원 차륜궤도연구실) ;
  • 이동형 (한국철도기술연구원 차륜궤도연구실) ;
  • 함영삼 (한국철도기술연구원 차륜궤도연구실)
  • Received : 20110229
  • Accepted : 2011.04.04
  • Published : 2011.05.01
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Abstract

The thermo-mechanical interaction between brake block and wheel tread during braking has been found to cause thermal crack on the wheel tread. Due to thermal expansion of the rim material, the thermal cracks will protrude from the wheel tread and be more exposed to wear during the wheel/block contact than the rest of the tread surface. The wheel rim is in residual compression stress when is new. After service running, the region in the tread has reversed to tension. This condition can lead to the formation and growth of thermal cracks in the rim which can ultimately lead to premature failure of wheel. In the present paper, the thermal cracks of railway wheel, one of severe damages on the wheel tread, were evaluated to understand the safety of railway wheel in running condition. The residual stresses for damaged wheel which are applied to tread brake are investigated. Mainly X-ray diffusion method is used. Under the condition of concurrent loading of continuous rolling contact with rails and cyclic frictional heat from brake blocks, the reduction of residual stress is found to correlate well with the thermal crack initiation.

Keywords

References

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