Multi-Directional Wave Velocity by Piezoelectric Crystalsby Tarun K. Agarwal, Old Dominion Univ, Norfolk, United States,
Isao Ishibashi, Old Dominion Univ, Norfolk, United States,
Abstract: Piezoelectric ceramics are successfully used to measure velocities of waves propagating through a dry granular material assembly. Several directional shear and compression waves are measured in a cubical (102 × 102 × 102 mm) specimen in order to quantify anisotropic characteristics of glass sphere assembly. Special configurations of piezoelectric bender elements are needed to transmit vibrating signals through highly energy-dispersive dry specimen especially for compression wave transmission. Detailed wave generation and measuring system, design of the piezoelectric sensors, and a brief experimental results are presented.
Subject Headings: Shear waves | Piezoelectricity | Wave velocity | Wave measurement | Ceramics | Granular materials | Compression
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