Determination of Charge Coefficient of Piezoelectric Films Using a Combined Finite Element Model and Dynamic Loading Technique

Abstract:

Accurate determination of piezoelectric properties such as piezoelectric charge coefficients (d₃₃) is an essential step in the design process of sensors and actuators using piezoelectric effect. In this study, a cost-effective and accurate method based on dynamic loading technique was proposed to determine the piezoelectric charge coefficient d₃₃. Finite element analysis (FEA) model was developed in order to estimate d₃₃ and validate the obtained values with experimental results. The experiment was conducted on a piezoelectric disc with a known d₃₃ value. The effect of measuring boundary conditions, substrate material properties and specimen geometry on measured d₃₃ value were conducted. The experimental results reveal that the determined d₃₃ coefficient by this technique is accurate as it falls within the manufactures tolerance specifications of PZT-5A piezoelectric film d₃₃. Further, obtained simulation results on fibre reinforced and particle reinforced piezoelectric composite were found to be similar to those that have been obtained using more advanced techniques. FE-results showed that the measured d₃₃ coefficients depend on measuring boundary condition, piezoelectric film thickness, and substrate material properties. This method was proved to be suitable for determination of d₃₃ coefficient effectively for piezoelectric samples of any arbitrary geometry without compromising on the accuracy of measured d₃₃.

• Periodical: Key Engineering Materials (Volume 835)
• Pages: 229-242
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.835.229
• Online since: March 2020
• Authors: Oboso P. Bernard*, Dr. Nagih Shaalan, Mohab Hossam, Mohsen A. Hassan
• Keywords: Dynamic Loading Technique, Finite Element Model, Mathematical Model, Piezoelectric Charge Coefficient, Piezoelectric Films, PZT

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