An experimental study of domain switching criterion for soft PZT piezoceramics subjected to coaxial proportional electromechanical loading
An experimental study of domain switching criterion for soft PZT piezoceramics subjected to coaxial proportional electromechanical loading
复制标题
同轴比例机电加载下软PZT压电陶瓷磁畴切换准则的实验研究
DOI：
10.1117/12.599592
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发表时间：
2005
影响因子：
5.3
通讯作者：
B. Laskewitz
中科院分区：
文献类型：
--
作者：
Dayu Zhou;M. Kamlah;Zhenggui Wang;B. Laskewitz
现代的压电式换能器通常结构复杂，工作在恶劣的载荷条件下。超过临界水平的外加载荷将导致材料中的磁畴转变，从而导致极化和应变响应中的显著非线性和滞后。为了建立关于铁电陶瓷大信号非线性行为的本构模型，需要确定多轴应力和电场状态下的切换准则。在这项实验工作中，“软”的锆钛酸铅(PZT)样品在初始非极化状态下受到比例机电加载，其中同时施加压应力和平行的比例电场。通过改变试验之间应力场和电场的相对比例，得到了一族非线性极化和应变响应。通过同时考虑介电响应、弹性变形、压电效应和不可逆磁区转换的贡献，试图解释实验结果。基于一种偏移法，在双向应力和电场空间中绘制了转换面(磁畴重定向阈值)。最后对文献中存在的几种开关条件进行了总结，并与实验数据进行了比较。
Modern piezoelectric transducers normally have complicated structures and work under severe loading conditions. Application of an external load in excess of a critical level will cause domain switching in the material and therefore lead to a significant nonlinearity and hysteresis in the polarization and strain response. To develop a constitutive model concerning the large-signal nonlinear behavior of ferroelectric piezoceramics, it is desirable to determine a switching criterion in the multiaxial stress and electric field states. In this experimental work, "soft" lead zirconate titanate (PZT) specimens in initially unpoled state were subjected to a proportional electromechanical loading, in which a compressive stress and a parallel, proportional electric field were applied simultaneously. By varying the relative proportions of the stress and E-field between tests, a family of nonlinear polarization and strain responses were obtained. An attempt has been made to explain the experimental findings by simultaneously taking into account the contributions of dielectric response, elastic deformation, piezoeffects, and irreversible domain switching. Based on an offset method, switching (domain reorientation threshold) surfaces were mapped out in the biaxial stress and electric field space. Finally, several switching conditions existing in the literature were summarized and compared with the experimental data obtained in this work.