發(fā)布時(shí)間：2018-06-24 07:24

  本文選題：復(fù)合多鐵材料 + 鐵電性��； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：復(fù)合多鐵材料是指結(jié)合了表現(xiàn)出壓電特性的鐵電相和表現(xiàn)出磁致伸縮性的鐵磁相的材料。壓電材料表達(dá)機(jī)械和電場之間的耦合效應(yīng),磁致伸縮材料表達(dá)機(jī)械和磁場之間的耦合效應(yīng)。雖然鐵電相和鐵磁相都不能夠單獨(dú)實(shí)現(xiàn)電場和磁場之間的耦合,但是當(dāng)它們結(jié)合在一起時(shí),鐵電相和鐵磁相通過機(jī)械應(yīng)變間接耦合,實(shí)現(xiàn)了磁電耦合效應(yīng)。目前,一些單相材料也被研究證實(shí),顯示出具有磁電耦合的特性。然而,所有單相材料中檢測到的磁電耦合效應(yīng)都還處在較為微弱的水平,難以開發(fā)基于單相多鐵材料的應(yīng)用。但是在復(fù)合多鐵材料內(nèi),通過壓電特性和磁致伸縮特性相接合,可以獲得比單相材料更高的磁電耦合效應(yīng)。這也就意味著,復(fù)合多鐵材料的應(yīng)用研究前景廣闊,可以利用復(fù)合多鐵材料開發(fā)有用的磁電耦合設(shè)備。本論文中,主要利用有限元法和相應(yīng)偏微分方程,在COMSOL程序中對復(fù)合多鐵材料的磁電耦合特性進(jìn)行研究。分析以下幾個(gè)因素對復(fù)合多鐵材料磁電耦合系數(shù)的影響:(1)在雙層多層復(fù)合材料的靜態(tài)仿真中,分析幾何縱橫比,機(jī)械邊界條件和相體積比對磁電耦合的影響;(2)在三層復(fù)合多鐵材料的動(dòng)態(tài)仿真中,頂層和底層被設(shè)計(jì)為磁致伸縮層,中間層作為均勻材料進(jìn)行了建模,分析對于存在交變磁場的多鐵材料性能的影響因素;本論文中,還結(jié)合壓電材料、磁致伸縮材料、變幅桿,設(shè)計(jì)了采用變幅桿結(jié)構(gòu)的復(fù)合多鐵材料,并對其在COMSOL環(huán)境中進(jìn)行仿真。模擬計(jì)算其磁電耦合性能的大小,分析其磁電耦合性能的影響因素。
[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.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB33;O482

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本文編號(hào)：2060586