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

fYear

1991

fDate

8-11 Dec 1991

Firstpage

741

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1991. Proceedings., IEEE 1991

Conference_Location

Orlando, FL

Type

conf

DOI

10.1109/ULTSYM.1991.234092

Filename

234092