A study was conducted to evaluate, improve and optimize ultrasonic techniques for the detection of tight delaminations in composite laminates. Four graphite/epoxy panels were investigated using matched pairs of compression and shear wave ultrasonic transducers of three frequencies (1, 2. 25 and 5MHz). Pulse echo and through transmission modes were used and A-scans, C-scans and frequency spectra were analyzed. It was found that the higher frequency (5MHz) compression transducer operated in the pulse-echo mode gave the best results in most cases. Shear wave transducers were found to be cumbersome to use and unsuitable for the cases studied.
|Original language||English (US)|
|Number of pages||16|
|Journal||Proceedings of the Symposium on Waste Management|
|State||Published - Jan 1 1980|
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