基于电场分布的压电纤维复合材料性能优化

Performance Optimization of Piezoelectric Fiber Composites Based on Electric Field Distribution

将TiO2引入压电纤维复合材料(MFC)的粘结层以提高其介电常数,调控MFC极化和驱动过程中电场分布,实现了对MFC性能的优化。采用有限元分析的方法探究了粘结层介电常数对MFC电场分布的影响,指导设计了实验方案。采用切割-填充法制备了在粘结层聚合物中引入TiO2的MFC。铁电性能测试结果表明,MFC剩余极化强度随粘结层中TiO2质量分数的增加呈现先增大后减小的趋势,在粘结层中TiO2质量分数为8wt%时达到最大值。MFC驱动性能随TiO2质量分数变化的趋势与剩余极化强度一致,电场驱动下自由应变在TiO2质量分数为8wt%时达到峰值,为2.31με。研究表明,引入TiO2调节粘结层介电常数可有效改善MFC的性能。

The TiO2 is added into the bonding layer of piezoelectric fiber composite(MFC)to improve its dielectric constant,regulate the electric field distribution during MFC polarization and driving process,and optimize the MFC performance.The influence of the dielectric constant of the bonding layer on the electric field distribution of MFC were investigated by the finite element analysis method,and the experimental scheme was designed.MFC incorporating TiO2 into the tie layer polymer was prepared by a cut-fill method.The results of ferroelectric performance test show that the remanent polarization of MFC increases first and then decreases with the increase of TiO2 mass fraction in the bonding layer,and reaches the maximum when the mass fraction of TiO2 in the bonding layer is 8wt%.The driving performance of MFC is similar to the remanentl polarization intensity with the change of TiO2 mass fraction.The free strain under electric field drive reaches a peak at TiO2 mass fraction of 8wt%,which is 2.31με.Studies have shown that the introduction of TiO2 to adjust the dielectric constant of the bonding layer can effectively improve the performance of MFC.