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首页> 外文会议>Conference on Smart Structures and Materials 2000 Active Materials: Behavior and Mechanics 6-9 March 2000 Newport Beach, USA >A Finite Element Model of Ferroelectric/Ferroelastic Polycrystals
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A Finite Element Model of Ferroelectric/Ferroelastic Polycrystals

机译：铁电/铁弹性多晶体的有限元模型

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摘要

a finite element model of polarization switching in a polycrystallien ferroelectric/ferroelastic ceramic is developed. It is assumed that a crystallite switches if the reduction in potential energy of the polycrystal exceeds a critical energy barrier per unit volume of switching material. Each crystallite is represented by a finite element with the possible dipole directions assigned randomly subject to crystallographic constraints. The model accounts for both electricfield induced (i.e. ferroelectric) switching and stress induced (i.e. ferroelastic) switching with piezoelectric interactions. experimetnally measured elastic, dielectric, and piezoelectric constants are used consistently, but different effective critical energy barriers are selected phenomenologically. Electric displacmeent versus electric field, strai nversus electric field, stress versus strain ,and stress versus electric displacement loops of a ceramic lead lanthanum zirconate titanate (PLZT) are modelled well below the Curie temperature.
机译：建立了多晶铁电/铁弹性陶瓷中极化转换的有限元模型。假设如果多晶的势能的降低超过每单位体积的开关材料的临界能垒，则微晶开关。每个微晶都由有限元表示，其中可能的偶极子方向会受到晶体学约束的随机分配。该模型考虑了电场感应（即铁电）切换和应力感应（即铁弹性）切换以及压电相互作用。实验上一直使用弹性，介电和压电常数，但从现象学角度选择不同的有效临界能垒。在远低于居里温度的情况下，对陶瓷铅酸锆钛酸铅钛酸盐（PLZT）的电场相对于电场，横向电场，应力与应变以及应力与电位移回路进行了建模。

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