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

한국해양공학회 (Korean Society of Ocean Engineers)
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굽힘하중을 받는 배관의 파손에 미치는 감육의 영향

Effect of wall Thinning on the Failure of Pipes Subjected to Bending Load

  • 안석환 (부경대학교 기계공학부) ;
  • 이수식 (부경대학교 신소재공학부 대학원) ;
  • 남기우 (부경대학교 신소재공학부)
  • AHN SEOK-HWAN (School of Mechanical Engineering, Pukyong National University) ;
  • LEE SOO-SIG (Graduate School of Materials Science and Engineering, Pukyong National University) ;
  • NAM KI-WOO (Division of Materials Science and Engineering, Pukyong National University)
  • 발행 : 2004.11.01
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초록

Effects of circumferentially local wall thinning on the fracture behavior of pipes were investigated by monotonic four-point bending. Local wall thinning was machined on the pipes in order to simulate erosion/corrosion metal loss. The configurations of the eroded area included an eroded ratio of d/t= 0.2, 0.5, 0.6, and 0.8, and an eroded length of I = 10 mm, 25 mm, and 120 mm. Fracture type could be classified into ovalization, local buckling, and crack initiation depending on the eroded length and eroded ratio. Three-dimensional elasto-plastic analyses were also carried out using the finite element method, which is able to accurately simulate fracture behaviors excepting failure due to cracking. It was possible to predict the crack initiation point by estimating true fracture ductility under multi-axial stress conditions at the center of the eroded area.

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