【摘要】In this experimental work, multi-axial, non-proportional polarization rotation tests were performed for a commercial soft PZT material under purely electric field loading. Large pre-poled piezoceramic plates were cut into rectangular blocks of size 15mm x 5mm x 5 mm, with their long axes inclined at a set of angles (from 0° to 180°, in steps of 15°) to the initial poling direction. After cutting, the top and bottom 5mm x 5 mm surfaces were electroded with a thin layer of silver paint and then, a ramp-shaped electric field was applied to cause the polarization to change. In addition to the polarization measurement along the field loading direction, the normal strain responses in all three coordinate directions were monitored simultaneously using strain gauge technique. Based on a series of polarization and strain versus electric field curves, switching (domain reorientation threshold) surfaces were constructed in the bi-axial electric field plane using the conventional offset method. The experimental data can be used to examine the existing switching criteria in phenomenological models for the non-linear constitutive behavior of piezoceramics.
【摘要机译】在这项实验工作中，在纯电场负载下对商用软PZT材料进行了多轴，非比例极化旋转测试。将大的预极化压电陶瓷板切成尺寸为15mm x 5mm x 5 mm的矩形块，其长轴相对于初始极化方向倾斜一组角度（从0°到180°，以15°的步长）。切割后，在顶部和底部5mm x 5mm的表面上电镀一层薄薄的银漆，然后施加斜坡形电场使偏振发生变化。除了沿场加载方向进行极化测量外，还使用应变仪技术同时监视了所有三个坐标方向上的法向应变响应。基于一系列极化和应变对电场的曲线，使用常规偏移方法在双轴电场平面中构造了开关（畴重新定向阈值）表面。实验数据可用于检查现象模型中压电陶瓷非线性本构行为的现有转换标准。