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

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.

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