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Low Cycle Fatigue Behavior of Elbow Pipe With Local Wall Thinning

[+] Author Affiliations
Koji Takahashi, Satoshi Tsunoi, Takumi Hara, Sota Watanabe, Akira Mikami, Hajime Takada, Kotoji Ando, Masaki Shiratori

Yokohama National University, Yokohama, Japan

Paper No. PVP2008-61427, pp. 891-896; 6 pages
doi:10.1115/PVP2008-61427
From:
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4829-6
  • Copyright © 2008 by ASME

abstract

Low cycle fatigue tests were conducted using 100A elbow specimens with local wall thinning. Local wall thinning of 50% of the nominal pipe wall thickness was machined on the inside of elbow in order to simulate erosion/corrosion metal loss. The local wall thinning areas are located at three different areas, called extrados, crown and intrados. The elbow specimens were subjected to cyclic in-plane bending under displacement control without internal pressure. When the local wall thinning was located at intrados, fatigue life was the shortest. In addition, three-dimensional elastic-plastic analyses were also carried out using the finite element method. As a result, the crack penetration area and the crack growth direction were successfully predicted by the analyses. The fatigue lives estimated by the analyses were close to those obtained by the experiments.

Copyright © 2008 by ASME

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