Application of fracture mechanics to gas turbine engine components requires a knowledge of the initial flaw in the location of analysis. In general, initial flaws may be obtained by Non-Destructive Inspection (NDI) methods. Another known method is based on statistical analysis of flaw sizes. Flaw sizes can be obtained in two ways: either direct assessment of flaw distribution from specimen/component cut-ups, or back calculation of Pseudo-Initial Flaws (PIF) that correlate with the available fatigue data. In the latter method, first flaw sizes are obtained through iterative fracture mechanics analyses until good correlations between the predicted crack growth lives and actual component fatigue lives are obtained. These flaws are then statistically analyzed to obtain a PIF, reflecting the production batch of a given engine component. In this paper, the PIF approach is discussed and typical results are presented.
Crack growth analysis of gas turbine engine components
Rissausbreitungs-Analyse in Gasturbinen-Bauteilen
AIAA-Papers ; Jul ; 1-4
1988
4 Seiten, 8 Bilder, 4 Quellen
Aufsatz (Konferenz)
Englisch
Crack growth analysis of gas turbine engine components
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