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Published on: August 5, 2020
SH wave propagation in piezoelectric coupled plates
1Department of Civil Engineering, National University of Singapore, Singapore. cvewangq@nus.edu.sg
Summary
This study models shear horizontal (SH) wave propagation in piezoelectric coupled plates for structural health monitoring. Findings reveal how wave behavior changes with material properties, aiding damage detection in metal structures.
Area of Science:
- Solid Mechanics
- Materials Science
- Acoustics
Background:
- Investigates shear horizontal (SH) wave propagation in piezoelectric coupled plates.
- Accounts for piezoelectric coupling effects with an isotropic metal core.
- Distinct from prior work using piezoelectric cores, focusing on surface-bonded layers.
Purpose of the Study:
- To model SH wave propagation in a piezoelectric coupled plate system.
- To analyze the influence of piezoelectric coupling on wave characteristics.
- To explore applications in structural damage detection via wave signal analysis.
Main Methods:
- Theoretical derivation of dispersive characteristics and mode shapes.
- Mathematical modeling of piezoelectric coupled plate behavior.
- Numerical simulations to validate theoretical findings.
Main Results:
- Phase velocity approaches the metal core's bulk shear wave velocity at high wavenumbers (when metal plate velocity > PZT).
- Three asymptotic wave propagation solutions emerge when metal plate velocity < PZT.
- Electric potential mode shape transitions from quadratic to multi-nodal with increasing wavenumber/layer thickness.
Conclusions:
- The study provides theoretical insights into SH wave propagation in piezoelectric-metal structures.
- Findings are crucial for developing wave-based damage detection techniques in bonded metal structures.
- The behavior of electric potential mode shapes offers unique signatures for analysis.
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