Abstract
A computational multiple scattering simulation method was applied to analyze the characteristics of the ultrasonic shear wave that propagates in unidirectional carbon-fiber-reinforced epoxy composites with its polarization direction parallel to the fibers. The numerical simulations were carried out for regular as well as random fiber arrangements and for different frequencies. The results were combined with the one-dimensional theory describing the macroscopic propagation behavior, in order to identify the phase velocity and the attenuation coefficient of the composites. The phase velocity was found to be almost independent of the frequency. On the other hand, the attenuation coefficient was found to be nearly proportional to the frequency. Furthermore, the present analysis showed a good agreement with the experimental data.
