Investigation of frequency dependences for phase velocityof longitudinal acoustic waves in porous carbon fiber plastic compositesusing broadband acoustic spectroscopy with laser ultrasound source
A broadband laser ultrasonic spectroscopy method for the investigation of porous carbon fiber plastic composites is experimentally realized. The studied samples were unidirectional carbon plastics with different volume contents of the matrix and fiber. It is shown that the relative dispersion of the phase velocity of longitudinal acoustic waves characterizes the porosity of the sample.