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arXiv · 1703.01144

Auxetic behavior and acoustic properties of microstructured piezoelectric strain sensors

Maria Laura De Bellis·Andrea Bacigalupo
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Abstract

The use of multifunctional composite materials adopting piezo-electric periodic cellular lattice structures with auxetic elastic behavior is a recent and promising solution in the design of piezoelectric sensors. In the present work, periodic anti-tetrachiral auxetic lattice structures, characterized by different geometries, are taken into account and the mechanical and piezoelectrical response are investigated. The equivalent piezoelectric properties are obtained adopting a first order computational homogenization approach, generalized to the case of electro-mechanical coupling, and various polarization directions are adopted. Two examples of in-plane and out-of-plane strain sensors are proposed as design concepts. Moreover, a piezo-elasto-dynamic dispersion analysis adopting the Floquet-Bloch decomposition is performed. The acoustic behavior of the periodic piezoelectric material with auxetic topology is studied and possible band gaps are detected.

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Maria Laura De Bellis, Andrea Bacigalupo. 2017-03-03. Auxetic behavior and acoustic properties of microstructured piezoelectric strain sensors. https://doi.org/10.1088/1361-665x/aa7772

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