SYMPOSIA PAPER Published: 01 January 1988
STP25955S

Noncontact Ultrasonic Evaluation of Metal Matrix Composite Plates and Tubes

Source

Noncontacting electromagnetic acoustic transducers (EMATs) are used to generate and receive wideband pulses of ultrasound in graphite/aluminum (Gr/Al) plates and tubes. High precision velocity and attenuation measurements are used to locate defects and to determine elastic moduli. Both static global and scanned local values of the attenuation and velocity are measured by using large or small receiver EMAT separations, respectively. Nondispersive, shear horizontal, and lowest order symmetric Lamb waves are employed along with a four-transducer method which eliminates measurement uncertainties associated with EMAT lift-off variations. Elastic moduli of Gr/Al plates are determined from ultrasonic data.

Author Information

Reed, RW
United Technologies Research Center, East Hartford, CT
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Details
Developed by Committee: D30
Pages: 216–226
DOI: 10.1520/STP25955S
ISBN-EB: 978-0-8031-5038-6
ISBN-13: 978-0-8031-0967-4