含橢圓纖維壓電壓磁複合材料之電磁耦合現象

Abstract

本計畫探討含橢圓柱狀內含物壓電與壓磁纖維複合材料之電磁耦合行為。我們擬先建 立一完整的理論模型探討由壓電與壓磁材料組合而成橢圓纖維複合材料的電彈磁勢能 場，進而探討內含物為隨意或週期性分佈不同微觀結構對勢能場的影響，並由此推導 此複合材料之等效電磁耦合行為。此計畫將原本我們在圓柱纖維複合材料傳導現象的 理論模型推展擴充至多鐵橢圓纖維複合材料材料之電磁耦合現象，由於橢圓的形狀及 其方向性以及電、磁與力學的耦合，其物理行為將更為多元，而理論的複雜度也相對 提高，然研究結果將對尋找及設計新的電磁智能材料提供紮實的理論基礎。

This proposal concerns magnetoelectric effects in piezoelectric/piezomagnetic composites. Specifically, we aim to establish the mathematical framework of magnetoelectric potentials of piezoelectric/piezomagnetic elliptic fibrous composites, to explore how the microstructure influences the potential configurations, and to derive the magnetoelectric voltage coefficients for composites made of piezoelectric and piezomagnetic phases. For technological interests, we choose CoFe2O4 (CFO) and PZT as our constituents. The objective of this proposal is to generalize our recent progress on the conduction of matrix-elliptic fiberous composites to the magnetoelectric coupling in multiferroic elliptic fibrous composites, and to make further advances on the knowledge of active materials. Due to the complexity of the shape and orientation of the ellipses and the coupling of the fields, the problem becomes more difficult and interesting. Once we can model this phenomenon, we can handle the fibrous composite more accurately, and provide a new strategy to enhance the magnetoelectric properties of the heterogeneous media.