ZHAO Guoqi, HAN Wei, LUO Ying

(The Key Laboratory for Mechanical Structure Damage Detection & Assessment Technology of Chinese Machinery Industry,Jiangsu University, Zhenjiang, Jiangsu 212013)

Abstract: Interdigitated Electrodes Piezoelectric Fiber Composites use the interaction of fiber finger shaped piezoelectric phase and interdigitated electrodes interaction to improve the toughness. Because of its peculiar orthotropic piezoelectric driving property, Interdigitated Electrodes Piezoelectric Fiber Composites have a broad application prospect in the smart material and structure. Based on COMSOL Multiphysics simulation platform, using the finite element analysis method, the influence of the relationship between the geometry size of the interdigitated electrodes and the thickness of the piezoelectric fiber matrix on the driving property of 1-3 piezoelectric fiber composites material was calculated. The influence of the fiber diameter,branch interdigitated electrode width and electrode gap on the trend of driving strain in piezoelectric fiber composites was also analyzed. The results show that the electrodes width equal to half the thickness of the substrate, the optimal orthotropic driving property can be obtained. Using the piezoelectric fiber of smaller diameter for reduced substrate thickness can help to improve IDEPFC driving sensitivity. Reducing the electrode gap can reduce the driving voltage, and the biggest driving strain can be obtained when the ratio of the electrodes gap to the substrate thickness is greater than 4. Results of the research provide a theoretical guidance for the design optimization of the interdigital piezoelectric fiber composites material.

Key words:  finite element analysis；1-3 Piezoelectric Fiber Composites; interdigitated electrodes; performance