| ABSTRACT: | NON-DESTRUCTIVE EVALUATION OF MANUFACTURING ANOMALIES IN AERO-
ENGINE ROTOR DISKS
W. D. Feist1; ; G. Mook2, 3S. Taylor, H. Söderberg4, 5A. Mikic
1MTU Aero Engines GmbH, München, Germany; 2University Magdeburg, Magdeburg, Germany;
3Rolls-Royce plc, Bristol, UK; 4Volvo Aero Corporation, Trollhättan, Sweden; 5Snecma Moteurs,
Evry, France
Manufacturing anomalies introduced during machining of critical parts have become a significant
cause of gas turbine disc cracking events in the aero-engine. These anomaly types are usually different
to those commonly being targeted by current production NDI efforts. A European funded programme
‘MANHIRP’ has been set up to address this issue by introduction of quantitative results into probabil-
istic lifing concepts. The NDI efforts used to detect and quantify these anomalies. The results and
some open questions are presented in this paper. Three manufacturing methods with the appropriate
geometric features are under investigation: hole-making (holes), turning (flat surfaces) and broaching
(shaped slots). Commonly used NDI techniques as well as near term and longer term techniques are
investigated to test out their potential of detecting and quantifying the most life limiting anomalies.
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