Key points are not available for this paper at this time.
An ultrasonic resonance technique has been used in the nondestructive testing of a set of carbon-fibre-reinforced plastic specimens. Both compressional and shear wave resonance as well as internal damping were measured. The results were compared with static modulus measurements, and repeated after the specimens had been cracked in torsion.
Brown et al. (Sat,) studied this question.