Ultrasonic device and method for non-destructive evaluation of polymer composites
US5408882A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1993 |
| Grant date | Apr 25, 1995 |
| Priority date | — |
| Expiry date | Jul 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/105
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.