Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Effective numerical approach to assess low-cycle fatigue behavior of pipe elbows

  • Jang, Heung Woon (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Hahm, Daegi (Risk and Environmental Safety Research Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Jung, Jae-Wook (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Hong, Jung-Wuk (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST))
  • Received : 2017.09.07
  • Accepted : 2018.01.30
  • Published : 2018.06.25
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Abstract

We developed numerical models to efficiently simulate the low-cycle fatigue behavior of a pipe elbow. To verify the model, in-plane cyclic bending tests of pipe elbow specimens were conducted, and a through crack occurred in the vicinity of the crown. Numerical models based on the erosion method and tie-break method are developed, and the numerical results are compared with experimental results. The calculated results of both models are in good agreement with experimental results, and the model using the tie-break method possesses two times faster calculation speed. Therefore, the numerical model based on the tie-break method would be beneficial to evaluate the strength of piping systems under seismic loadings.

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