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Fretting Fatigue Modeling and Repair Evaluation for Generator Rotors

[+] Author Affiliations
Srikanth Akkaram, Mandar Chati, Sairam Sundaram

General Electric Global Research Center, Schenectady, NY

Gary Barnes

General Electric Power Systems, Schenectady, NY

Paper No. GT2003-38827, pp. 163-170; 8 pages
doi:10.1115/GT2003-38827
From:
  • ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
  • Volume 4: Turbo Expo 2003
  • Atlanta, Georgia, USA, June 16–19, 2003
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3687-8 | eISBN: 0-7918-3671-1
  • Copyright © 2003 by ASME

abstract

Generator Rotor Tooth Cracks have been recently observed on some long service generator rotors. The purpose of this paper is to document the root cause analysis as well as a repair methodology that was developed in support of one of these cracked units. The paper discusses the development of a finite element model to understand the operating modes and failure mechanisms that caused the initiation of these cracks. The results of the analysis agreed very well with field observations on cracked units and with some limited repair options that have been successfully used in the past. An experimental fretting fatigue testing program is currently underway to substantiate and extend the results reported in this paper.

Copyright © 2003 by ASME

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