High demands in safety at highest possible load of aircraft structures cause increasing expenditure in development of testing procedures for production, maintenance and overhaul. Aircraft structural parts which are generally designed to achieve minimum weight as well as high mechanical stability unfortunately very often have the disadvantages of low corrosion resistance and high susceptibility to crack formation and propagation. Consequently the latitude for tolerable flaw sizes is very small. Therefore, reliable, documented inspection is of increasingly vital importance. Eddy current testing is one of the most effective tools to detect open or concealed corrosion and to assess damage caused by fatigue or corrosion cracking. In respect of the different sources of corrosion and possible crack formation, to enable identification, evaluation and location it is necessary to have appropriate eddy current units and sensors optimized to the expected inspection program. The following describes the use of a meter type instrument (fig. 1) for inspection of surface defects and a new impedance plane instrument (fig. 2) that allows static and dynamic applications for detection of metal thinning due to corrosion, metal spacing, subsurface cracks etc. and for very quick fastener hole inspection. Finally new signal processing techniques for displaying flaw dimensions through imaging procedures are discussed. All units described herein are portable and battery operated.
New aspects in aircraft inspection using eddy current methods
Neue Aspekte bei der Inspektion von Flugzeugen mit Wirbelstromverfahren
1990
8 Seiten, 15 Bilder
Aufsatz (Konferenz)
Englisch
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