2-3型压电复合材料有效特性及其静水压性能的研究

Effective Properties and Hydrostatic Performance of Type 2-3 Piezoelectric Composites

压电复合材料是由至少一种压电材料与非压电材料按照一定的连通方式组合在一起而构成的具有压电效应的材料。采用均匀场理论,提出了2-3型压电复合材料的代表性体积单元,通过建立串联、并联等模型预估了压电复合材料的弹性刚度常数:C11、C12、C13、C22、C23、C33,压电常数:e31e、32e、33,介电常数:3ε3。然后用有限元方法(使用了有限元分析软件ANSYS)分析了压电复合材料的材料常数,并用有限元方法验证了均匀场理论求解2-3型压电复合材料有效特性参数的准确性。根据求得的有效特性参数进一步研究了2-3型压电复合材料的静水压性能,由于求得的静水压性能值很低,又改良了2-3型压电复合材料的模型,获得了较好的静水压性能。并将改良前后2-3型压电复合材料与3-2型压电复合材料的静水压性能进行了比较。

Piezoelectric composites imply that piezoelectric ceramics are connected with inactive polymer. The present work deals with the micro-mechanics model of type 2-3 composites. Series and parallel models were proposed to predict the elastic, piezoelectric and dielectric constants. Based on the linear piezoelec- tric theory and uniform field theory, the closed form formulae for the model were derived. The finite ele- ment method was also adopted to forecast the effective electroelastic properties and to confirm the accura- cy of the model. The hydrostatic piezoelectric strain constant （ d h ）, hydrostatic piezoelectric voltage constant （gh）, and hydrostatic figure of merit （dk·gh ） of type 2-3 composites were calculated, and the lower hydrostatic performance was obtained. To attain higher hydrostatic performance, the electrode was improved. A comparison was carried out for the hydrostatic performance of type 2-3 composites and type 3-2 composites. The results predicte that the optimum hydrostatic response is gained by using improved type 2-3 composites or type 3-2 comuosite.