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Formula for Estimation of Effective Applied Load at Cracked Section Considering Compliance Change and its Application Under Dynamic Loading Conditions

[+] Author Affiliations
Yeji Kim

Korea Institute of Nuclear Safety, Daejeon, South Korea

Young-Jin Oh

KEPCO Engineering and Construction, Gimcheon, South Korea

Yun-Jae Kim

Korea University, Seoul, South Korea

Il-Soon Hwang

Seoul National University, Seoul, South Korea

Paper No. PVP2018-84877, pp. V03AT03A053; 6 pages
  • ASME 2018 Pressure Vessels and Piping Conference
  • Volume 3A: Design and Analysis
  • Prague, Czech Republic, July 15–20, 2018
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5162-3
  • Copyright © 2018 by ASME


The refinement of the piping integrity assessment methods has emerged as a priority issue, in response to heightened concerns about the beyond design basis accident following several events. The compliance change in structures may have a significant influence on the fracture estimation. For instance, the deformation of a crack in the piping system may result in a decrease of the applied moment at the cracked section. To consider these effects, the authors have developed the general formula for prediction of the effective applied moment at circumferential cracked section based on the elastic beam theory. Using the developed formula, one can evaluate the extent of the load reduction at a crack position due to the change in compliance. This paper aims to expand the applicability of the formula for dynamic loading conditions. By conducting the time history analysis using FE model accompanying the comparisons with the piping system experiment results, it was confirmed that the formula is also available for dynamic loading conditions. It is expected that the proposed formula can be implemented in sthe piping integrity assessment to consider the restraint effect.

Copyright © 2018 by ASME



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