对称磁电层合板磁电转换效应理论研究

A theoretical study on symmetrical magnetostrictive/piezoelectric laminated composite

磁致伸缩和压电层合材料通过磁致伸缩和压电效应的乘积可以获得大的磁电效应 .通过材料的力学本构方程 ,建立了对称磁电层合板磁电耦合的静态力学模型 ;采用ANSYS 8 0多物理场有限元分析软件 ,对层合结构的磁电转化效应进行了数值计算 ,并与理论计算值进行了对比 .研究结果表明 :磁致伸缩 压电的厚度比增加使磁电电压系数增大 ;所推导的磁电电压系数公式的计算值与等效电路模型推导的公式计算值符合很好 ;有限元数值计算结果介于两种模型的计算结果之间 .

The magnetoelectric (ME) effect is a product property of the composite material consisting of individual piezoelectric and magnetostrictive phases. Based on the constitutive equations of the materials, the ME coupling of a symmetrical magnetostrictive/piezoelectric laminated composite is modeled using a simple static elastic method. The ME coupling is also simulated by numerical technique employing the ANSYS 8.0/Multiphysics finite element software. It is found that the ME voltage coefficient in the static method is quite close to that in the equivalent circuit approach and increases with the increase of the magnetostricive/piezoelectric thickness ratio. Using the numerical modeling we can calculate the ME voltage coefficient of the magnetostrictive/piezoelectric laminated composite effectively.