Manufacturing anomalies introduced during machining of critical parts, although rare in occurrence, have become a significant cause of gas turbine disk cracking events in the aero-engine. These mainly non-geometric anomaly types are usually different to those commonly targeted by current production NDI efforts. A European Union funded programme MANHIRP addressed this issue by introduction of quantitative NDI results into probabilistic lifing concepts. Applications of common and new NDI methods and their strengths and limitations are described in this paper. The experiments carried out have shown possibilities to increase the probability of detecting both geometric and non-geometric manufacturing induced anomalies using NDI to prevent their escape into service. Some methods are appropriate to be applied as 100 % serial inspection. Others will be used only in suspicious cases e.g. after a tool breakage was reported or after an alarm was triggered from an applied process monitoring system. Some examples may not be practicable immediately but show a potential for further development efforts. However there is still need to increase the detectability of anomalies especially for methods that can be automated and so reduce the human factors.
NDI for manufacturing anomalies in aero-engine rotor disks
Zerstörugsfreie Untersuchung von Herstellerfehlern in Flugzeugdüsen-Rotorscheiben
2006
10 Seiten, 17 Bilder, 9 Quellen
Conference paper
Storage medium
English
Gas Turbine Aero Engine Rotor Balance and Vibration
Emerald Group Publishing | 1964
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