Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Estimation of Probability Distribution of Fatigue Lives in Crank Throw Forged Steel

크랭크스로 단조강의 피로수명의 확률분포 추정

  • Kim, Seon-Jin (Department of Mechanical Design Engineering, Pukyong National University) ;
  • Ahn, Seok-Hwan (Department of Mechatronics, Jungwon University)
  • 김선진 (부경대학교 기계설계공학과) ;
  • 안석환 (중원대학교 메카트로닉스학과)
  • Received : 2016.02.23
  • Accepted : 2016.05.18
  • Published : 2016.06.30
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Abstract

Because of the severe service environment of the large marine vessel, the fatigue strength and its evaluation play an important role in design and maintenance of marine crankshaft. The aim of this work is to investigate the probability distribution of fatigue lives in crank throw forged steel and to develop the methodology for estimation of the probabilistic design fatigue strength. Detailed studies were performed on the constant amplitude axial loading fatigue test. The experiments were controlled by stress ratio of -1 and 15Hz frequency for each stress level. The considerable variability of fatigue life was observed in each stress level under rigidly controlled constant fatigue testing conditions. The fatigue life of crank throw forged steel was well followed the log-normal and Weibull distribution. In addition, it can be used for the estimation of probabilistic design fatigue strength by using the proposed methodology.

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References

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