Measuring and testing – Vibration – By mechanical waves
Patent
1993-07-21
1995-04-25
Noland, Thomas P.
Measuring and testing
Vibration
By mechanical waves
73602, 73644, 73642, G01N 2918
Patent
active
054088828
ABSTRACT:
An ultrasonic measurement device and a method for a non-destructive evaluation of polymer composites having discontinuous fibers distributed therein. The device has one or a plurality of substantially matched pairs of transducers disposed on wedge shaped focuser and a relay, the focuser and relay each have their impedances substantially matched to that of the polymer composite being analyzed. The device is placed on a surface of the composite with the apexes of the focuser and relay in close contact with the surface. A velocity of a substantially longitudinal ultrasonic wave generated by the first transducer and received by the second transducer after its passage through the composite is determined at several angles of orientations about a center point, and the measured velocities of the ultrasonic wave are processed through a computer having software to determine the physical attributes of the composite, such as weight percentage of fibers present in the composite, Young's modulus, shear modulus and Poisson's ratio of the composite.
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patent: 5038787 (1991-08-01), Antich et al.
patent: 5048340 (1991-09-01), Thompson et al.
patent: 5127268 (1992-07-01), Kline
Composites, 20, 575-583 (1989).
Metallurgical Transactions A, 18A, 473-480 (1987).
Gilmore Robert S.
Matsumoto Dean S.
McAlea Kevin P.
McKinley Barbara J.
Ashraf Nashmiya
General Electric Company
Goldman David C.
Noland Thomas P.
Webb II Paul R.
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