Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Fatigue Crack Growth Behavior of Gray Cast Iron for Brake Disc of a Passenger Car

대형승용차 디스크 브레이크용 회주철의 피로균열 전파 거동

  • Kim, Ho-Kyung (Department of Automotive Engineering, Seoul National University of Technology) ;
  • Park, Jin-Ho (Department of Automotive Engineering, Graduate School, Seoul National University of Technology) ;
  • Yang, Kyoung-Tak (Department of Automotive Engineering, Graduate School, Seoul National University of Technology) ;
  • Choi, Deok-Ho (Department of Automotive Engineering, Graduate School, Seoul National University of Technology)
  • 김호경 (서울산업대학교 자동차공학과) ;
  • 박진호 (서울산업대학교 산업대학원 자동차공학과) ;
  • 양경탁 (서울산업대학교 산업대학원 자동차공학과) ;
  • 최덕호 (서울산업대학교 산업대학원 자동차공학과)
  • Published : 2006.08.31
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Abstract

Fatigue crack propagation tests for the brake disc cast iron were conducted for investigating fatigue crack propagation rate(da/dN), crack propagation path and fracture toughness($K_c$) of the material. The threshold stress intensity factor range, ${\Delta}K_{th}$, was found to be about $6MPa{\sqrt{m}}$ at the stress ratio of R = 0.1. Also, fracture toughness value was determined to be $24.7MPa{\sqrt{m}}$. Irregular fatigue fracture surfaces were observed, indicating that fatigue crack growth occurred at the interface between randomly scattered flak graphite and ferrite, where the interfacial strength was relatively weak.

Keywords

References

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