Numerical calculation of homogenized properties of piezoelectric composites

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2022-11-25

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Kurt, Mustafa

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Piezoelectric materials are the materials we use in many parts of our lives without being aware. These materials can convert electrical energy into mechanical energy or vice versa. Although this ability renders piezoelectric ceramics very attractive materials for sensing and actuation applications, their use often remains limited, due to their weight and brittleness. As a result of these drawbacks, piezoelectric composites are developed, and they offer superior performance compared to monolithic piezoelectric materials. The main aim of this study is to numerically calculate the effective material properties (elastic, piezoelectric, and dielectric) of piezoelectric composites to determine the behavior and performance of the piezoelectric composites. With micromechanical methods, the overall behavior of piezoelectric composites is obtained by using the properties of their constituents through a finite element analysis of a periodic representative volume element (RVE) or a unit cell model. In this study, different piezoelectric fiber composites are studied. The most encountered piezocomposite in the literature is 1-3 type piezocomposites, whose full set of material moduli is extracted using the homogenization method. The results are verified with experimental data and different numerical studies from the literature. The homogenization method is validated with a macro-scale boundary value problem and the results are compared with a numerical study from the literature. Moreover, porous piezoceramics are investigated. The effects of size, shape, and distribution of pores upon the effective material properties and performance coefficients are investigated. Finally, the porosity is incorporated into the 1-3 piezocomposites and its influence on the hydrostatic performance coefficients is investigated.

Subject Keywords

Piezoelectricity, Composite, Homogenization, Finite element analysis, Porosity

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https://hdl.handle.net/11511/101170

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

M. Kurt, “Numerical calculation of homogenized properties of piezoelectric composites,” M.S. - Master of Science, Middle East Technical University, 2022.