Proceedings of the Korea Committee for Ocean Resources and Engineering Conference (한국해양공학회:학술대회논문집)

Korean Society of Ocean Engineers (한국해양공학회)
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The Effect of Temperature on Fatigue Fracture in Pressure Vessel Steel at Low Temperature

저온 압력용기용 강의 피로파괴에 미치는 온도의 영향

  • Park, Keyung-Dong (School of Mechanical Engineering, Pukyong National University) ;
  • Ha, Keyung-Jun (Graduate School of Mechanical Engineering, Pukyoung National University)
  • 박경동 (부경대학교 기계공학부) ;
  • 하경준 (부경대학교 대학원 기계공학과)
  • Published : 2002.10.25
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Abstract

The fatigue crack growth behavior of the SA516/60 steel which is used for pressure vessels was examined experimentally at room temperature $25^{\circ}C,\;-30^{\circ}C,\;-60^{\circ}C,\;-80^{\circ}C,\;-100^{\circ}C$ and $-120^{\circ}C$ with stress ratio of R=0.05, 0.1 and 0.3. Fatigue crack propagation rate da/dN related with stress intensity factor range ${\Delta}K$ was influenced by stress ratio in stable of fatigue crack growth (Region II) with an increase in ${\Delta}K$. The resistance of fatigue crack growth at low temperature is higher compared with that at room temperature, which is attributed to tile extent of plasticity-induced by compressive residual stress according to the cyclic loads. Fractographic examinations reveal that the differences of the fatigue crack growth characteristics between room and low temperatures are mainly explained by the crack closure and the strengthening due to the plasticity induced and roughness induced.

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