ABSTRACT
The elastic constants of Ceramic Matrix Composites (CMC) in both macroscopic and microscopic areas were obtained using two types of ultrasonic measurement systems. Macroscopic elastic constants were measured by a double-through-transmission method, and microscopic ones were measured using an ultrasonic microspectrometer. By comparison between these values and those measured by tensile tests, it was conformed that the elastic constants of unidirectional CMC could be determined by ultrasonic waves appropriately not only in a macroscopic area but also in a microscopic one.
