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Abstract
A discrete ray tracing model based on elastodynamic ray theory was developed and applied to a composite material with fibre waviness. The varying anisotropy of this composite causes the ultrasonic waves to travel along curved paths. Particular attention was paid to the comparison with experimental measurements in order to check the applicability of the method for non-destructive characterization of fibre waviness, especially in the high frequency regime. A specimen with intentional fibre waviness was fabricated by winding prepreg tape around a specially designed mandrel. The specimen was tested in the through-transmission mode using special ultrasonic techniques for thick composites. The theoretical model and experimental results agree, at least with regard to the period of fibre waviness.
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