层状复合多铁材料的磁电耦合特性研究

发布时间：2018-06-24 07:24

本文选题：复合多铁材料 + 铁电性　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：复合多铁材料是指结合了表现出压电特性的铁电相和表现出磁致伸缩性的铁磁相的材料。压电材料表达机械和电场之间的耦合效应,磁致伸缩材料表达机械和磁场之间的耦合效应。虽然铁电相和铁磁相都不能够单独实现电场和磁场之间的耦合,但是当它们结合在一起时,铁电相和铁磁相通过机械应变间接耦合,实现了磁电耦合效应。目前,一些单相材料也被研究证实,显示出具有磁电耦合的特性。然而,所有单相材料中检测到的磁电耦合效应都还处在较为微弱的水平,难以开发基于单相多铁材料的应用。但是在复合多铁材料内,通过压电特性和磁致伸缩特性相接合,可以获得比单相材料更高的磁电耦合效应。这也就意味着,复合多铁材料的应用研究前景广阔,可以利用复合多铁材料开发有用的磁电耦合设备。本论文中,主要利用有限元法和相应偏微分方程,在COMSOL程序中对复合多铁材料的磁电耦合特性进行研究。分析以下几个因素对复合多铁材料磁电耦合系数的影响:(1)在双层多层复合材料的静态仿真中,分析几何纵横比,机械边界条件和相体积比对磁电耦合的影响;(2)在三层复合多铁材料的动态仿真中,顶层和底层被设计为磁致伸缩层,中间层作为均匀材料进行了建模,分析对于存在交变磁场的多铁材料性能的影响因素;本论文中,还结合压电材料、磁致伸缩材料、变幅杆,设计了采用变幅杆结构的复合多铁材料,并对其在COMSOL环境中进行仿真。模拟计算其磁电耦合性能的大小,分析其磁电耦合性能的影响因素。
[Abstract]:Composite ferroelectric materials are materials which combine ferroelectric phase with ferroelectric phase and ferromagnetic phase with magnetostrictive property. Piezoelectric materials express coupling effects between machinery and electric field, and magnetostrictive materials express coupling effects between machinery and magnetic field. Although ferroelectric phase and ferromagnetic phase can not realize the coupling between electric field and magnetic field alone, when they are combined, ferroelectric phase and ferromagnetic phase are indirectly coupled by mechanical strain to realize magnetoelectric coupling effect. At present, some single-phase materials have also been confirmed, showing magnetoelectric coupling characteristics. However, the magnetoelectric coupling effect detected in all single-phase materials is still weak, so it is difficult to develop applications based on single-phase multi-ferroelectric materials. However, the magnetoelectric coupling effect is higher than that of single-phase materials through the combination of piezoelectric and magnetostrictive properties in composite multi-iron materials. This means that the application of composite multi-iron materials has a broad prospect, and it can be used to develop useful magnetoelectric coupling equipment. In this paper, the magnetoelectric coupling characteristics of composite multi-iron materials are studied by finite element method and corresponding partial differential equations in COMSOL program. The influence of the following factors on the magnetoelectric coupling coefficient of the composite multilayer composite material is analyzed. (1) in the static simulation of the double-layer multilayer composite material, the geometric aspect ratio is analyzed. The effect of mechanical boundary condition and phase volume ratio on magnetoelectric coupling. (2) in the dynamic simulation of three-layer composite multi-iron material, the top layer and bottom layer are designed as magnetostrictive layer, and the middle layer is modeled as homogeneous material. The influence factors on the properties of ferromagnetic materials with alternating magnetic field are analyzed. In this paper, a composite ferroelectric material with variable amplitude bar is designed, which is composed of piezoelectric material, magnetostrictive material and amplitude lever. It is simulated in COMSOL environment. The magnitude of magnetoelectric coupling performance is simulated and the influencing factors of magnetoelectric coupling performance are analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB33;O482

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