Abstract
Measurements of ultrasonic reflectance from laminated composite plates of glass-epoxy immersed in a fluid have been carried out in order to study the behavior of Lamb waves in these materials. Initial experiments have been performed on unidirectional composites of varying plate thickness with the projection of the incident acoustic wave vector oriented parallel to the fiber direction. By varying the incident ultrasound frequency, we observe the existence of several Lamb wave modes at incident angles from 10 to 45 degrees. These data have been compared to the results of a model calculation using a mixture theory to derive the elastic properties of the plate and an approximate analytical method to calculate the modes of a fluid-loaded, anisotropic plate. In many cases the agreement is quite good, but under some conditions we are not able to observe all the modes predicted by our model. We also present measurements of the reflected beam profiles showing the presence of leaky Lamb waves.
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