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Element Size Dependent Damage Modeling of Ductile Crack Growth in Circumferential Through-Wall Cracked Pipe Tests

[+] Author Affiliations
Jong-Hyun Kim, Nak-Hyun Kim, Yun-Jae Kim

Korea University, Seoul, Korea

Do-Jun Shim

Engineering Mechanics Corporation of Columbus, Columbus, OH

Paper No. PVP2012-78277, pp. 393-399; 7 pages
doi:10.1115/PVP2012-78277
From:
  • ASME 2012 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Toronto, Ontario, Canada, July 15–19, 2012
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5502-7
  • Copyright © 2012 by ASME

abstract

This paper proposes an element-size-dependent damage model to simulate ductile crack growth in full-scale cracked pipes. The proposed method is based on the stress-modified fracture strain damage model modified from stress reduction technique proposed previously by the authors. A modification is made that the critical accumulated damage for progressive cracking is assumed to be dependent on the element size. The proposed method is then compared with a circumferential through-wall cracked pipe test that was conducted during Degrade Piping Program[18].

The bending moment at crack initiation, maximum bending moment, crack extension, and J-integral values were calculated from the FE damage analysis. These results were compared with the experimental results. In addition, results obtained from an existing J-estimation scheme were provided for comparison. All results showed reasonable agreement.

The results of the present study demonstrate that the element-size-dependent damage modeling can be applied to simulate the ductile crack growth behavior of a through-wall cracked pipe.

Copyright © 2012 by ASME

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