Rotational and linearly scanned eddy current probes based on giant magnetoresistive (GMR) sensors have been developed for detecting buried cracks and flaws emanating from fastener holes. The use of shaped excitation coils, the original positioning and orientation of the magnetic sensors enhance the sensitivity of these probes to buried defects while reducing the influence of fastener holes edge. Corner cracks of 2.5 mm in length were detected in the second layer of a 13 mm thick two-layer structure. Transverse notches of 2 mm in length, 1 mm in height were detected at 4.8 mm depth in a two-layer specimen containing a row of holes using linearly scanned probes.
Deep crack detection around fastener holes in airplane multi-layered structures using GMR-based eddy current probes
Risstiefenbestimmung um Bolzenlöcher in Flugzeug-Mehrschichtstrukturen mittels Riesenmagnetowiderstand-Wirbelstromsensoren
2004
8 Seiten, 9 Bilder, 4 Quellen
Conference paper
English
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