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Distinguishing Ratcheting and Shakedown Conditions in Pressure Vessels

[+] Author Affiliations
W. Reinhardt

Babcock & Wilcox Canada, Cambridge, ON, Canada

Paper No. PVP2003-1885, pp. 13-26; 14 pages
doi:10.1115/PVP2003-1885
From:
  • ASME 2003 Pressure Vessels and Piping Conference
  • Computer Technology and Applications
  • Cleveland, Ohio, USA, July 20–24, 2003
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-1699-0
  • Copyright © 2003 by ASME

abstract

The nature of the boundary between stable cycling and ratcheting is discussed using several illustrative example scenarios. The examples are analyzed in the context of the elastic methods currently in the ASME Code to demonstrate the conservatism of the existing approach that exists in some cases, and the unconservative estimation that exists in others. It is shown that the limit on the linearized primary plus secondary stress range can be related to conditions for elastic shakedown in certain kinematic hardening models of plasticity, while the limits on thermal stress ratchet address only scenarios similar to the Bree problem.

Copyright © 2003 by ASME

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