23 July 1993 Interferometric study of audio frequency vibrations in type 1-3 piezocomposites
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Dynamic displacement measurements have been made on type 1 - 3 piezocomposite materials using scanning heterodyne interferometry to map the magnitude and phase of surface displacements. Specimens were electrically driven using sinusoidal voltages at frequencies below 25.0 kHz. All the materials studied consisted of square cross section PZT-5H rods arranged in a periodic square array and embedded in an epoxy resin matrix. The volume percentage of rods varied between 9 and 20 percent and matrices of varying hardness were used. In addition, a sample with a modified matrix to rod interface was measured. For the hard interface material, the rods and matrix tended to move together, while for the soft interface materials, rods displaced much more than the matrix. At low audio frequencies the samples exhibited both plate wave and thickness modes. The plate wave amplitudes were comparable to or larger than rod amplitudes for specific combinations of frequency and boundary conditions.
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William R. Scott, William R. Scott, Martin J. Ryan, Martin J. Ryan, Dianne M. Granata, Dianne M. Granata, "Interferometric study of audio frequency vibrations in type 1-3 piezocomposites", Proc. SPIE 1916, Smart Structures and Materials 1993: Smart Materials, (23 July 1993); doi: 10.1117/12.148487; https://doi.org/10.1117/12.148487

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