Damage-tolerance-based life prediction of aeroengine compressor discs: II. A probabilistic fracture mechanics approach

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DOIResolve DOI: http://doi.org/10.1016/0142-1123(90)90003-W
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TypeArticle
Journal titleInternational Journal of Fatigue
ISSN0142-1123
Volume12
Issue5
Pages388396; # of pages: 9
Subjectlife assessment; aeroengine compressor discs; non-destructive inspection; fatigue crack growth; probabilistic fracture mechanics; probability of detection; safe inspection interval; damage tolerance
AbstractThis paper reports the results of a demonstration computer program carried out to determine the influence of the sensitivity and reliability of non-destructive inspection (NDI) techniques on the damage-tolerance-based life assessment of aeroengine compressor discs. The program was carried out on AM-355 martensitic stainless-steel compressor discs from an aeroengine. The safe inspection intervals (SII) for the compressor discs are calculated using probabilistic fracture mechanics (PFM) principles. These calculations involve the use of the NDI data, finite-element analysis and the experimental fatigue crack growth rate (FCGR) data base generated on compact tension specimens machined from safe-life-expired discs. The PFM analysis, which randomly uses the distribution of undetected crack sizes for a given NDI technique to choose an ai value for fracture mechanics calculations, demonstrates that the worst-case combinations of ai and FCGR do not occur during 7000 disc simulations. The PFM results also indicate that it may be possible to obtain cost effective SII if the sensitive eddy current and the automated ultrasonic leaky surface wave techniques are used to inspect the discs. However, the behaviour of short cracks would have to be characterized prior to obtaining usable PFM-based SII.
Publication date
LanguageEnglish
AffiliationNRC Institute for Aerospace Research; National Research Council Canada
Peer reviewedYes
NPARC number21275964
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Record identifier53c7d672-1c6a-4da0-af93-15ec84920590
Record created2015-08-21
Record modified2016-05-09
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