Title :
Low frequency directional acoustic microscope for nondestructive evaluation [ceramic matrix composites]
Author :
Bashyam, Manohar ; Rose, Joseph L.
Author_Institution :
GE Aircraft Engines, Cincinnati, OH, USA
Abstract :
The main thrust of this work was to develop a technique for measuring the anisotropic properties of materials. A low-frequency (5-MHz) technique was developed using single transducer similar to the one used in acoustic microscopy, to measure anisotropic properties of ceramic matrix composite (CMC) materials. Experiments were conducted to verify that the velocity of the surface acoustic wave (SAW) is a function of the fiber orientation and fiber content of unidirectional CMC. Several important anomalies were imaged and compared to the results obtained from destructive analysis. The results are presented
Keywords :
acoustic microscopes; ceramics; fibre reinforced composites; surface acoustic waves; ultrasonic materials testing; ultrasonic transducers; ultrasonic velocity; 5 MHz; anomalies; ceramic matrix composite; fiber content; fiber orientation; low frequency directional acoustic microscope; nondestructive evaluation; surface acoustic wave velocity; transducer; unidirectional materials; Acoustic materials; Acoustic measurements; Acoustic transducers; Anisotropic magnetoresistance; Ceramics; Composite materials; Conducting materials; Frequency; Microscopy; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1991. Proceedings., IEEE 1991
Conference_Location :
Orlando, FL
DOI :
10.1109/ULTSYM.1991.234092
