交叉指形电极压电纤维复合材料静电场优化

Optimizing of Electrostatic Field of Piezoelectric Fiber Composites

采用有限元法分析了外电压作用于交叉指形电极(IDE)压电纤维复合材料时的静电场分布,讨论了静电场对元件极化和动作性能的影响,研究了电极区聚合物的介电常数和厚度尺寸及其IDE分支电极宽度和电极中心距对压电纤维复合材料静电场的影响。结果表明:增加电极区聚合物的导电性或减小电极区聚合物的厚度,压电纤维复合材料静电场可以得到显著提高,同时,元件横向应变可以提高108倍,横向应力可以提高43倍;IDE参数对电场的均匀区域大小和电场强度大小影响比较大。

The electrostatic field distribution of interdigitated electrode piezoelectric fiber composites （IDEPFCs） was analyzed by finite element method. The impact of electrostatic field on poling progress and actuation was discussed. The influence of material constants of polymer around electrodes, polymer＇ s geometry parameters between electrodes and piezoelectric fibers, electrode width and space on electrostatic field was also studied. The results show that the electrostatic field could be improved much by increasing the conductivity or decreasing the thickness of the polymer around electrodes. In addition, the maximum transverse strain could increase 108 times and transverse stress could increase 43 times. The uniform field and electrostatic field are influenced much by the dimension of IDE too.