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Proceedings Paper

Acoustic wave propagation in composite materials: an experimental study
Author(s): Sridhar Rudraraju; Anbo Wang; Kent A. Murphy; Richard O. Claus
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Paper Abstract

This paper demonstrates acoustic speed measurements in anisotropic composite materials using a fiber-optic extrinsic Fabry-Perot interferometric sensor (EFPI). Acousto-ultrasound technique is used to generate unidirectional surface acoustic waves in a multilayered composite specimen. The principle of operation and the fabrication of the EFPI sensor are explained. The composite specimen is interrogated by a piezoelectric transducer driven by 1.2 MHz signal pulses from an rf generator. The acoustic speed is calculated by noting the difference in the arrival times of the acoustic signal detected by the sensor for different locations of the piezoelectric source separated by a known distance. The possible variation of the acoustic signal speed with respect to the direction of the fibers is studied. This study could be used in determining the dispersion curves of materials and impact locating detection in composite materials.

Paper Details

Date Published: 1 May 1994
PDF: 7 pages
Proc. SPIE 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation, (1 May 1994); doi: 10.1117/12.173981
Show Author Affiliations
Sridhar Rudraraju, Virginia Polytechnic Institute and State Univ. (United States)
Anbo Wang, Virginia Polytechnic Institute and State Univ. (United States)
Kent A. Murphy, Virginia Polytechnic Institute and State Univ. (United States)
Richard O. Claus, Virginia Polytechnic Institute and State Univ. (United States)


Published in SPIE Proceedings Vol. 2191:
Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation
James S. Sirkis, Editor(s)

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