Propagation of wide-band acoustic pulses in unidirectional fibrous

Propagation of acoustic videopulses in unidirectional fibrous graphite-epoxy composites is studied. The immersion technique with thermooptical ultrasound excitation is used. Experiments have shown that the mechanical properties of such media can bе described bу the orthotropic model. ln the frequency range of from 1 to 15 MHz, frequency dispersion of phase velocity has not been observed independently of the direction of ultrasound propagation in the composite.