In recent years requirements have been created, by the FAA, U.S. Air Force, and engine manufacturers, for the ultrasonic inspection of selected in-service engine components. Typically, inspection sensitivities are developed in terms of calibrating to or detecting artificial embedded 'defects' or artifacts such as flat bottom holes (FBHs) or side drilled holes (SDHs). These artifacts are used because they are relatively easy to make, but they impose constraints on attempts to thoroughly evaluate the integrity of inspections. Also, FBHs and SDHs are not very similar to any real embedded defects found in engine alloys. A need exists for new specimens containing embedded artifacts that produce a range of reflectivities, are producible in different sizes, allow interrogation from different angles, are reproducible and relatively inexpensive to make, can be made in large quantities, and can be placed in realistic engine component features. This paper examines the reasons for these artificial defect requirements and makes recommendations for specimens that will allow quantitative assessment of the probability of detection for automated ultrasonic inspections of engine components.
Probability of detection for embedded defects. Needs for ultrasonic inspection of aerospace turbine engine components
Wahrscheinlichkeit des Nachweises eingebetteter Fehler. Notwendigkeit der Ultraschallprüfung von Komponenten an Luftfahrtturbinen
2005
8 Seiten, 3 Bilder, 4 Tabellen, 12 Quellen
Conference paper
Storage medium
English
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