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

Korean Society of Ocean Engineers (한국해양공학회)
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Acoustic Emission Characteristic with Local Wall Thinning under Static and Cyclic Bending Load

정적 및 반복굽힘하중을 받는 감육된 탄소강배관의 AE 특성 평가

  • Ahn, Seok-Hwan (School of Materials Science and Engineering, Pukyong National University) ;
  • Kim, Jin-Hwan (Graduate School of Materials Science and Engineering, Pukyong National University) ;
  • Nam, Ki-Woo (Division of Materials Science and Engineering, Pukyong National University) ;
  • Park, In-Duck (Division of Materials Science and Engineering, Pukyong National University) ;
  • Kim, Yong-Un (Graduate School of Materials Science and Engineering, Pukyong National University)
  • 안석환 (부경대학교 기계공학부) ;
  • 김진환 (부경대학교 대학원 재료공학과) ;
  • 남기우 (부경대학교 재료공학부) ;
  • 박인덕 (부경대학교 재료공학부) ;
  • 김용운 (부경대학교 대학원 재료공학과)
  • Published : 2002.05.17
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Abstract

Fracture behaviors of pipes with local wall thinning are very important for the integrity of nuclear power plant. However, effects of local wall thinning on strength and fracture behaviors of piping system were not well studied. Acoustic emission(AE) has been widely used in various fields because of its extreme sensitivity, dynamic detection ability and location of growing defects. In this study, we investigated failure modes of locally wall thinned pipes and AE signals by bending test. From test results, we could be divided four types of failure modes of ovalization, crack initiation after ovalization, local buckling and crack initiation after local buckling. And fracture behaviors such as elastic region, yielding range, plastic deformation range and crack progress could be evaluated by AE counts, accumulative counts and time-frequency analysis during bending test. It is expected to be basic data that can protect a risk according to local wall thinning of pipes, as a real time test of AE.

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