Acoustic Emission (AE) offers the opportunity to monitor the landing gear of aircraft continuously throughout the certification test period, thus providing early warning of any possible fatigue or corrosion failure within the structure without intrusion on the test schedule and without gear dismantling. This investigation considers the identification of fatigue crack growth in aerospace grade steel using Acoustic Emission (AE) techniques. Four specimens with small radius crack initiation sites were investigated under four-point bending (SENB4). A linear array of 4 resonant AE sensors was utilised to locate the crack growth. Detection and location of fatigue crack growth in aerospace grade steel SENB4 specimens using appropriate AE techniques was successful. Time of arrival (TOA) linear location has provided an invaluable tool for separating AE signals arising from fatigue crack growth from the notch from those emanating from the loading points. Analysis of the AE feature data from the notch has allowed initial categorisation of AE from fatigue crack growth. AE data from this research was found to correspond with that reported in previous studies examining Compact Tension (CT) specimens. Though the size of the specimens enabled the crack growth to be monitored with a linear array of sensors, the type of loading was not ideal because the line contacts between the rollers and the specimen provided very active sources of AE. It was possible to monitor the AE from this source, even though it was unwanted information. Further investigation is necessary.
Detection of fatigue crack growth in aircraft landing gear, 4 point bend test specimens
Prüfung auf Ermüdungsrisswachstum in Flugzeugfahrgestellen (Prüfstücke von 4-Punkt-Biegetest)
2005
8 Seiten, 11 Bilder, 1 Tabelle, 5 Quellen
Conference paper
English
Biegeprüfung , Fahrgestell , Flugzeug , In-Situ-Messung , Kompaktzugversuch , kontinuierliche Messung , Materialermüdung , Messaufnehmerfeld , Risswachstum , Schadenfrüherkennung , Schallemissionsprüfung , Signalauswertung , Signalfolge , Stahl , Störsignal , Zeiteinsparung , zerstörungsfreie Prüfung
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