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Case Study of the Effect of Generator Retaining Ring Shrink Fit on Rotor Tooth Top Cracking

[+] Author Affiliations
Daniel T. Peters, Kevin M. Haley

Structural Integrity Associates, Inc., Rootstown, OH

Paper No. POWER2011-55302, pp. 585-594; 10 pages
doi:10.1115/POWER2011-55302
From:
  • ASME 2011 Power Conference collocated with JSME ICOPE 2011
  • ASME 2011 Power Conference, Volume 1
  • Denver, Colorado, USA, July 12–14, 2011
  • ISBN: 978-0-7918-4459-5
  • Copyright © 2011 by ASME

abstract

A significant concern in generator operation is cracking in the tops of the rotor teeth due to cyclic fatigue. The shrink fit of a retaining ring over the rotor end induces compressive stresses in the rotor to contain the entire assembly and reduce shear stresses in the rotor teeth during operation. This paper is a case study of the effect of this shrink fit on fatigue life using three dimensional finite element analysis with nonlinear contact to simulate the interaction between the rotor, wedges and retaining ring. For the analysis, consideration was made for both operational and shut down loading to determine the stress state in both conditions for application in fatigue analysis. Overspeed conditions were not considered for this analysis.

Copyright © 2011 by ASME

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