Service-induced damage in turbine discs and its influence on damage tolerance-based life prediction

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TypeArticle
Journal titleCanadian Aeronautics and Space Journal
Volume35
Issue1
Pages411; # of pages: 8
SubjectDisks--Fatigue; Fracture Mechanics; Damage Tolerance; Inconel 718; Life Prediction; Safe Inspection Intervals; Service-Induced Damage; Gas Turbines
AbstractThe damage tolerance-based life prediction concepts proposed for gas turbine components are explained. The results of a demonstration program carried out to calculate the Safe Inspection Intervals (SIIs) for new and service-exposed turbine discs are presented. Effects of service exposure on the microstructure and fatigue crack growth rate of Inconel 718 discs are studied in detail. It is suggested that there may be considerable risk involved in assuming that crack-free components can be used repeatedly beyond 'safe life limit' for several SIIs, unless the SII value is continually updated, taking into account the deterioration of microstructure with increasing service.
Publication date
LanguageEnglish
AffiliationNRC Institute for Aerospace Research; National Research Council Canada
Peer reviewedYes
NPARC number21275991
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Record identifiera839b4a9-763a-4270-b3f4-33b235bef5de
Record created2015-08-31
Record modified2016-05-09
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