Location

La Jolla, CA

Start Date

1-1-1991 12:00 AM

Description

Ultrasonic measurement of elastic properties has been widely exploited to characterize the behavior of a variety of media. For composites, the task is somewhat more complicated than for conventional, isotropic materials as additional moduli require additional measurements with a concomitant growth in the algebraic complexity of the calculations. Furthermore, acoustic waves propagating in an arbitrary direction in an anisotropic media will, in general, be neither pure longitudinal or pure transverse in character. Finally, in an anisotropic media, energy will not necessarily propagate with the phase velocity in the direction of the wave normal. This fact has an important impact in the placement of transducers and in the interpretation of experimental results. Nevertheless, complete ultrasonic characterization of the elastic properties of composites is possible and is currently being performed in several research laboratories. The ability to directly measure the elastic properties of a composite on a local basis has widespread implications for future directions in composite NDE.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

10B

Chapter

Chapter 6: Engineered Materials

Section

Properties of Composites

Pages

1491-1497

DOI

10.1007/978-1-4615-3742-7_46

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Ultrasonic Modulus Determination in Composite Media

La Jolla, CA

Ultrasonic measurement of elastic properties has been widely exploited to characterize the behavior of a variety of media. For composites, the task is somewhat more complicated than for conventional, isotropic materials as additional moduli require additional measurements with a concomitant growth in the algebraic complexity of the calculations. Furthermore, acoustic waves propagating in an arbitrary direction in an anisotropic media will, in general, be neither pure longitudinal or pure transverse in character. Finally, in an anisotropic media, energy will not necessarily propagate with the phase velocity in the direction of the wave normal. This fact has an important impact in the placement of transducers and in the interpretation of experimental results. Nevertheless, complete ultrasonic characterization of the elastic properties of composites is possible and is currently being performed in several research laboratories. The ability to directly measure the elastic properties of a composite on a local basis has widespread implications for future directions in composite NDE.