压电复合材料的电弹耦合特性分析

利用Eshelby 理论及Mori-Tanaka 平均场原理, 推导出压电陶瓷/ 聚合物两相复合材料的有效电弹模量表达式。该表达式能反映两相材料复合的物理本质。并以椭圆柱形压电纤维增强的聚合物基复合材料为例,分析压电复合材料的电弹耦合特性。结果表明: 复合材料的平均电弹模量在很大程度上取决于电弹耦合效应;该效应与组成相的空间连接型、体积占有率及压电夹杂形状有关; 耦合效应的存在是由各组成相材料性能差异引起的。 

ANALYSIS TO THE COUPLED ELECTROELASTIC BEHAVIORS OFPIEZOELECTRIC COMPOSITES

The explicit expression for effective elect roelastic moduli of piezoelect ric ceramic/ polymer biphase piezocomposite was obtained by employing Eshelby’s model and Mori-Tanaka average field theory. The expression canreflect physical insight for piezocomposites. As a practical example , the coupled elect roelastic behaviors were analyzed for a piezoelect ric elliptic cylindrical fiber reinforced polymer composite. The result s show that the averageelect roelastic moduli depend on the coupled elect roelastic effect s which have relations to the connectivity , volumef raction and the shape of piezoelect ric inclusions. The origin of the coupling effect s is related to the existence of mismatch elect roelastic moduli of constituent s.