多铁性复合材料动态耦合响应的有限元分析

Finite Element Analysis of Dynamic Coupling Responses of Multiferroic Composites

多铁性材料在实际应用中往往需要考虑多场动态耦合效应。为研究磁电多铁性复合材料的动态耦合效应及其界面的影响,建立了在动态激励下磁电耦合响应的有限元分析模型,其中采用内聚力模型单元模拟压电和压磁材料间界面,以表征其刚度和强度。对多个算例进行了磁电动态耦合响应分析,考察了界面刚度以及边界条件对动态磁电耦合响应的影响。结果显示,界面刚度和边界约束对磁电多铁性复合材料的动态耦合效应有较大影响,界面刚度越大,耦合效应越强。

Dynamic multi-field coupling effects are often concerned for multiferroie materials in practice. In order to study this issue interfaces influences, a finite element model for magneto electric （ME） multiferroic composites subjected to dynamic excitation was constructed. In the model, cohesive zone elements were employed to simulate the interfaces between piezoelectric and piezomagnetic phases to characterize the interracial stiffness and strength. The dynamic ME coupling responses of several examples were analyzed. The influences of interracial stiffness as well as boundary conditions on the responses were investigated. The results show that the interfacial stiffness and boundary conditions play an important role on the dynamic ME coupling of multiferroic composites. Strong interfaces are beneficial to the coupling.