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Ultrasonic defect evaluation using DGS-diagrams modified for the inspection of anisotropic composite materials

: Spies, M.; Rieder, H.; Dillhöfer, A.


Chimenti, D.E.:
41st Annual Review of Progress in Quantitative Nondestructive Evaluation. Vol.34 : Boise, Idaho, 20-25 July 2014, QNDE 2014
Woodbury, N.Y.: AIP, 2015 (AIP Conference Proceedings 1650)
ISBN: 978-0-7354-1292-7
Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE) <41, 2014, Boise/Idaho>
Conference Paper
Fraunhofer ITWM ()

The application of DGS-diagrams (Distance-Gain-Size) for defect sizing using ultrasonics is considered for anisotropic materials. Based on far-field formulations for transducers with circular apertures, it is shown that the general DGS-diagram for isotropic materials can be applied to anisotropic media as well, if sonic modifications in the evaluation are performed. The modified procedure is illustrated and validated using ultrasonic inspection data acquired at a unidirectionally carbon-fiber reinforced composite test block with flat-bottomed holes as model defects.