In the paper two different single-side air-coupled ultrasonic techniques for detection and visualization of the defects in aerospace composite materials are presented. The first technique is based on the pitch-catch arrangement of the transducers and application of the Lamb wave which is shielded by defects. The second one, that gives more accurate results, is based on the same orientation of the transmitter and the receiver for reception of the Lamb wave scattered - reflected by the defect. The damage visualization results of both techniques are investigated. The results of in situ damage detection are presented. Different types of aerospace materials such as CFRP and honeycomb have been tested by two different single-side access air-coupled ultrasonic techniques. Both single-side access air-coupled ultrasonic techniques have shown high sensitivity to various types of defects in the aerospace composite materials. It has been shown that scattering - reflection technique is more accurate and is more suitable for sizing of defects than the technique with pitchcatch arrangement of the transducers. The signal processing technique have been developed that essentially reduces the influence of the interference of the ultrasonic signals and enables to obtain C scan images having better resolution and contrast. Air-coupled ultrasonic measurements have been carried out in situ. The in situ measurements demonstrated high reliability of the air-coupled technique for defect detection in airspace composite materials.
Ultrasonic air-coupled non-destructive testing of aerospace components
Luftangekoppelte zerstörungsfreie Ultraschallprüfung von Luftfahrtkomponenten
2006
8 Seiten, 8 Bilder, 10 Quellen
Conference paper
Storage medium
English
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