三相壓電壓磁纖維複合材料之磁電耦合效應

Abstract

磁電耦合效應由於電場與磁場間之交互影響作用，使得磁電材料在致動器、感測器的發展上備受矚目。然而，單相多鐵性材料的磁電耦合效應太低，不足以應用於工程上，因此，發展出以多鐵性複合材料的方式來提升磁電耦合效應。 本研究以雙層法概念及微觀力學模型Mori-Tanaka模式，配合有限元素法(COMSOL Multiphysics)建立之數值模型驗證下，預測三相壓電壓磁纖維複合材料之磁電耦合效應。過程中，藉由三種不同材料配置於核心、殼層及母材得到磁電效應最佳化配置。另外，由變動材料係數的方式，選擇適當的現有材料來提升磁電效應。由結果得知，在選擇適當材料配置前後磁電耦合效應皆有顯著之提升，且部分的提升配置由三相材料所控制。另外，本文嘗試以殼層置入一材料的方式，模擬非完美交界面之現象，並由選擇適當之界面相材料分析後，證實其可行。

Magnetoelectric (ME) effects refer to the interaction between electric and magnetic fields, which makes ME materials in actuators and sensors on the development of attention. However, the magnetoelectric effect is weak in single phase multiferroic materials. Therefore, we resort to the multiferroic composites of core-shell-matrix three-phase fibrous to enhance the magnetoelectricity. In this work, we propose a micromechanical model, the two-level recursive scheme in conjuction with Mori-Tanaka’s method, to investigate the effective magnetoelectric coupling coefficients of the composite. We compare this micromechanical solution with those predicted by finite element analysis (COMSOL Multiphysics), which provides the benchmark results for a periodic array of inclusions. Both the magnitudes and trends between them are in good agreement. Based on this micromechanical approach, by choosing the appropriate materials before and after the configuration is a significant rise of the magnetoelectric effects, and some optimization is controlled by the three-phase material. In addition, we show that this three-phase core-shell-matrix model can be used to estimate the behavior of composites with imperfect interfaces, and selecting the suitable interphase materials confirmed its feasible.