Journal of Industrial Technology (산업기술연구)

Kangwon National University, Institute of Industrial Technology (강원대학교 산업기술연구소)
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A Study on the Initial Crack Growth in Spheroidal Graphite Cast Iron under Extremely Low Cycle Loading

극저사이클 하중을 받는 구상흑연주철의 초가균열성장에 관한 연구

  • 김민건 (강원대학교 기계메카트로닉스공학부) ;
  • 임복규 (강원대학교 대학원 기계메카트로닉스공학과) ;
  • 김동열 (삼척대학교 정말기계공학과)
  • Published : 2002.06.30
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Abstract

In this study, extremely low cycle fatigue tests were carried out under push-pull loading conditions using graphite cast iron (GCD). In order to clarify the fatigue fracture mechanism of GCD in an extremely low cycle fatigue regime successive observations of internal fatigue damage were performed. The results obtained are as follows. (1) The process of extremely low cycle fatigue can be classified into three stages which are composed of the generation, growth and coalescence of microvoids inside materials. (2) In an extremely low cycle fatigue regime, microvoids originate from debonding of graphite-matrix interface.

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