Tests reported in this study show that it is possible to locate flaw areas in a composite tube with both ultrasonic C-scan and ultrasonic spectroscopy procedures. The paper points out that frequency signatures obtained from ultrasonic spectroscopy can be useful in nondestructively evaluating composite materials. A theoretical sample problem is presented that demonstrates the sensitivity of the spectroscopy method in detecting pulse spreading. Experiments on two composite tubes are also presented to show the difference in frequency signatures that occurs when comparing flaw and no flaw areas in a structure.
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