Simulation of Extremely Low Cycle Fatigue Fracture in Ductile Cast Iron

구상흑연주철 극저사이클 피로파괴의 시뮬레이션 구현

  • 김민건 (강원대학교 기계메카트로닉스공학부) ;
  • 임복규 ((재)울산산업진흥테크노파크 자동차부품혁신센터)
  • Published : 2006.12.01


In this study, fatigue tests were carried out under push-pull loading condition using spheroidal graphite cast iron in order to clarify the internal fatigue fracture mechanism in an extremely low cycle fatigue regime. It is found that a successive observation of internal fatigue damage it is found that the fracture processes go through three stages, that is, the generation, growth and coalescence of microvoids originated from debonding of graphite-matrix interface. It is also found that the crack which is initiated from the void propagates by coalescence of neighboring cracks and the fatigue crack growth rate can be expressed in form of the Manson-Coffin rule type. In this paper, quantitative analyses of fatigue properties for realization of simulation about fatigue life evaluation are also presented.


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