Proceedings of the Korean Society of Marine Engineers Conference (한국마린엔지니어링학회:학술대회논문집)

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Fatigue Crack Properties of Pressure Structural Steel at Low Temperature

저온환경에서 압력 구조용 강의 피로균열특성

  • 최용범 (경상대학교 대학원 정밀기계공학과) ;
  • 박원조 (경상대학교 수송기계공학부) ;
  • 이광영 (경상대학교 수송기계공학부) ;
  • 허선철 (경상대학교 수송기계공학부) ;
  • 김정호 (동의대학교 산업기술연구소)
  • Published : 2001.05.01
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Abstract

Low temperature fatigue crack propagation ratio and characteristics of the pressure structural steel which is used for the low temperature pressure vessels. Fatigue crack properties was studied at room temperature of $25^{\circ}C$ and low temperature ranges $-60^{\circ}C,\; -80^{\circ}C \;and\; -100^{\circ}C$ with stress ratio of R=0.05, 0.1, 0.3 in the logarithmic relationship between the fatigue crack propagation rate (da/dN) and stress intensity factor $\DeltaK$, in low temperature case the relationship was extend to the range of low crack propagation rate. The fractured specimens were examined by SEM tested. That results showed specimen failed at low temperature exhibit the quasi-cleavage fracture formation, however, considerable ductility proceed final fracture.

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