Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Failure Criteria of a 6-Inch Carbon Steel Pipe Elbow According to Deformation Angle Measurement Positions

변형각의 측정 위치에 따른 6인치 탄소강관엘보의 파괴 기준

  • Yun, Da Woon (Seismic Research and Test Center, Pusan National University) ;
  • Jeon, Bub Gyu (Seismic Research and Test Center, Pusan National University) ;
  • Chang, Sung Jin (Seismic Research and Test Center, Pusan National University) ;
  • Park, Dong Uk (Seismic Research and Test Center, Pusan National University) ;
  • Kim, Sung Wan (Seismic Research and Test Center, Pusan National University)
  • 윤다운 (부산대학교 지진방재연구센터) ;
  • 전법규 (부산대학교 지진방재연구센터) ;
  • 장성진 (부산대학교 지진방재연구센터) ;
  • 박동욱 (부산대학교 지진방재연구센터) ;
  • 김성완 (부산대학교 지진방재연구센터)
  • Received : 2021.07.27
  • Accepted : 2021.10.21
  • Published : 2022.01.01
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Abstract

This study proposes a low-cycle fatigue life derived from measurement points on pipe elbows, which are components that are vulnerable to seismic load in the interface piping systems of nuclear power plants that use seismic isolation systems. In order to quantitatively define limit states regarding leakage, i.e., actual failure caused by low-cycle fatigue, in-plane cyclic loading tests were performed using a sine wave of constant amplitude. The test specimens consisted of SCH40 6-inch carbon steel pipe elbows and straight pipes, and an image processing method was used to measure the nonlinear behavior of the test specimens. The leakage lines caused by low-cycle fatigue and the low-cycle fatigue curves were compared and analyzed using the relationship between the relative deformation angles, which were measured based on each of the measurement points on the straight pipe, and the moment, which was measured at the center of the pipe elbow. Damage indices based on the combination of ductility and dissipation energy at each measurement point were used to quantitatively express the time at which leakage occurs due to through-wall cracking in the pipe elbow.

Keywords

Acknowledgement

본 연구는 한국연구재단이 주관하는 원자력연구개발사업 (NRF- 2020M2A8A4023949)의 지원을 받아 수행되었습니다.

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