Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Marco and Microscopic Observations of Fatigue Crack Growth Behavior in API 2W Gr. 50 Steel Joints

API 2W Gr. 50 강재 용접부의 피로균열전파거동의 거시적 및 미시적 관찰

  • Sohn, Hye-Jeong (Department of Mechanical Design Engineering, Pukyong National University) ;
  • Kim, Seon-Jin (Department of Mechanical and Automotive Engineering, Pukyong National University)
  • 손혜정 (부경대학교 대학원 기계설계공학과) ;
  • 김선진 (부경대학교 기계자동차공학과)
  • Received : 2012.08.06
  • Accepted : 2012.10.25
  • Published : 2012.10.31
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Abstract

It is well known that a considerable amount of scatter is shown in experimental results relating to fatigue crack growth even under identical and constant amplitude cyclic loading conditions. Moreover, flux cored arc welding (FCAW) is a common method used to join thick plates such as the structural members of large scale offshore structures and very large container ships. The objective of this study was to investigate the macro- and microscopic observations of the fatigue crack growth (FCG) behavior of the FCAWed API 2W Gr. 50 steel joints typically applied for offshore structures. In order to clearly understand the randomness of the fatigue crack growth behavior in the materials of three different zones, the weld metal (WM), heat affected zone (HAZ), and base metal (BM), experimental fatigue crack growth tests for each of five specimens were performed on ASTM standard compact tension (CT) specimens under constant amplitude cyclic loading. Special focus was placed on the fatigued fracture surfaces. As a result, a different behavior was observed at the macro-level, depending on the type of material property: BM, HAZ, or WM. The variability in the fatigue crack growth rate for WM was higher than that of BM and HAZ.

Keywords

References

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