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Influences of Cyclic Pre-Overload on Low Cycle Fatigue Behaviours of Elbow Pipe

[+] Author Affiliations
Kazuya Matsuo, Koji Takahashi, Kyohei Sato

Yokohama National University, Yokohama, Kanagawa, Japan

Paper No. PVP2011-57581, pp. 1213-1219; 7 pages
doi:10.1115/PVP2011-57581
From:
  • ASME 2011 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Baltimore, Maryland, USA, July 17–21, 2011
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4456-4
  • Copyright © 2011 by ASME

abstract

Low cycle fatigue tests were conducted using sound elbows made of carbon steel (STPT410). The elbows were subjected to cyclic in-plane bending under displacement control with internal pressure of 9 MPa. The preliminary fatigue tests were conducted under constant cyclic displacements. Then, two test conditions were adopted to investigate the influence of cyclic pre-overload on low cycle behavior of elbow on the basis of the preliminary test results. The fatigue test results were evaluated by using the total usage factor UFTotal (= UFpre +UFpost ), where the UFpre and UFpost correspond to usage factor for δpre and δpost , respectively. The fatigue lives of overloaded elbow pipes were estimated based on the cumulative fatigue damage rule basically from UFpre = 0.2 to UFpre = 0.6. In addition, three-dimensional elastic-plastic analyses were carried out using the finite element method. The crack penetration area and the crack growth direction were successfully predicted by the analyses.

Copyright © 2011 by ASME

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