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Modified J Estimation by GE/EPRI Method for Circumferential Surface Cracked Pipes Under Bending or Combined Bending and Pressure Loads

[+] Author Affiliations
Jing Zhang, Chang-Jun Liu, Fu-Zhen Xuan, Pei-Ning Li

East China University of Science and Technology, Shanghai, China

Paper No. PVP2011-57334, pp. 1029-1037; 9 pages
doi:10.1115/PVP2011-57334
From:
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4453-3
  • Copyright © 2011 by ASME

abstract

In order to assess the structural integrity of the components in nuclear power plants, it is necessary to accurately evaluate the J-integral. EPRI J-integral estimation method has been widely used. However for the pipes with circumferential surface cracks, since the solutions of fully plastic factors H1 were few under the combined pressure and bending loading condition. In such a case, EPRI J-integral might be non-conservative in elastic-plastic transition zone. Considering the problems, detailed finite element analysis (FEA) were conducted in this work, and H1 , shape factors F were provided for the pure pressure, pure bending, and combined pressure and bending conditions. The reasons for non-conservatism of EPRI method were discussed, and a modified J estimation method was developed. For validation, failure assessment curves (FACs) were employed to compare the proposed J-integral estimation, EPRI J-integral and FEA method. The results showed that FAC based on the proposed J-integral method agreed well with FEA result, which provided good confidence in the use of this method.

Copyright © 2011 by ASME
Topics: Pressure , Stress , Pipes

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