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Evaluation of Thermal Fatigue Lifetimes of Cast Iron Brake Disc Materials

제동 디스크용 주철의 물성 및 열피로 특성평가

  • 구병춘 (한국철도기술연구원 신교통연구본부) ;
  • 임충환 (STX 메탈주식회사 기술연구소)
  • Received : 2011.06.01
  • Accepted : 2012.05.21
  • Published : 2012.08.01

Abstract

We measured the mechanical and thermal properties of four types of cast irons used for manufacturing the brake discs of railway vehicles. It was found that these properties could be controlled by varying the composition of Ni, Cr, and Mo. Thermal fatigue tests were carried out by using a thermal fatigue tester in which thermal cycles could be controlled. Thermal crack initiation and propagation were measured on cylindrical specimens. Finally, we simulated the thermal fatigue test procedure by finite element analysis and calculated the thermal fatigue lifetimes by Manson-Coffin's equation and the maximum principal strain. The estimated thermal fatigue lifetimes corresponded to the measured lifetimes when the total crack length was $40{\mu}m{\sim}1mm$.

Keywords

Brake Disc;Cast Iron;Finite Element Analysis;Thermal Fatigue;Railway Vehicle

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