Abstract
Results of theoretical and experimental studies of the dispersion effects for the propagation of elastic shear waves in crossply fiber-reinforced composites are presented. These crossply composites are formed from elementary layers and stacked with a given sequence in predetermined directions defining a superperiod. Two laminated and periodic materials exhibiting a fourfold and an eightfold axis of rotation, respectively, have been investigated. When the elastic wavelength becomes comparable to the composite period, spatial dispersion effects are expected: departure from the linearity of the dispersion curves, stop bands, and in the eightfold-axis material, an acoustical activity induced by the helical stacking of the elementary layers. A theoretical analysis of these various effects is presented, and experimental results obtained through an ultrasonic spectroscopy method are given. >
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