Self-consistent modelling of non-linear effective properties of polycrystalline ferroelectric ceramics

被引：15

作者：

Rödel, J ^{[1
]}

Kreher, WS ^{[1
]}

机构：

[1] Tech Univ Dresden, Inst Werkstoffwissensch, D-01062 Dresden, Germany

来源：

COMPUTATIONAL MATERIALS SCIENCE | 2000年 / 19卷 / 1-4期

关键词：

ferroelectric ceramics; effective properties; extrinsic properties; micromechanics; ferroelectric domains;

D O I：

10.1016/S0927-0256(00)00147-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A constitutive model for the nun-linear effective behaviour of ferroelectric ceramics is presented. The model is developed on the basis of the effective medium approximation (EMA), which describes the interaction of the crystallites in a statistical way. Additionally, a particular simplified domain configuration within the crystallites and the possibility of domain wall motion are taken into account. In connection with a thermodynamic criterion for the domain wall displacement the volume fractions of the domains can be calculated dependent on the crystallite orientation and the applied load in a self-consistent manner. This mechanism leads to an extrinsic contribution to the effective behaviour. If the domain wall displacement is associated with energy dissipation the macroscopic behaviour is non-linear and hysteretic. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：123 / 132

页数：10

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