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Evaluation of the material parameters of piezoelectric materials by various methods

机译:通过各种方法评估压电材料的材料参数

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摘要

The elastic, dielectric and piezoelectric constants of four piezoelectric materials, including polyvinylidene fluoride, vinylidene fluoride-trifluoroethylene copolymer, PZT/epoxy 1-3 composite, and lead metaniobate ceramic, have been evaluated from the impedance data using five different methods. A method described in ANSI/IEEE Std. 176-1987, though based on formulae derived for lossless materials, is found to be applicable to materials with moderate loss. However, for high-loss materials such as polyvinylidene fluoride, the electromechanical coupling constant (k[sub t]) obtained by the method of Std. 176 is substantially higher than the actual value. Calculations based on a piezoelectric resonance analysis program (PRAP) combine the best features of two earlier methods. In addition to the impedance at the parallel resonance frequency, impedances at two other frequencies are required for calculation. The PRAP method gives quite accurate material parameters regardless of the magnitude of the loss, but the parameters (including k[sub t]) vary by as much as 15% depending on the choice of data. In the nonlinear regression method described in the present work, all the impedance data points around the resonance are least-squares fitted to the theoretical expression for the impedance. Besides the advantage of requiring no arbitrary choice of data, the nonlinear regression method can readily take account of the frequency dependence of the dielectric constant.
机译:使用五种不同方法从阻抗数据中评估了四种压电材料的弹性,介电常数和压电常数,包括聚偏二氟乙烯,偏二氟乙烯-三氟乙烯共聚物,PZT /环氧1-3复合材料和偏铌酸铅陶瓷。 ANSI / IEEE标准中描述的方法。 176-1987,尽管是基于针对无损材料得出的公式,但适用于中等损耗的材料。然而,对于高损耗材料,例如聚偏二氟乙烯,通过Std方法获得的机电耦合常数(k [sub t])。 176大大高于实际值。基于压电共振分析程序(PRAP)的计算结合了两种早期方法的最佳功能。除了并联谐振频率处的阻抗外,还需要其他两个频率处的阻抗进行计算。 PRAP方法给出了非常准确的材料参数,而与损耗的大小无关,但是根据数据选择,参数(包括k [sub t])相差多达15%。在本工作中描述的非线性回归方法中,谐振周围的所有阻抗数据点都是最小二乘拟合的理论表达式。除了不需要任意选择数据的优点外,非线性回归方法还可以轻松考虑介电常数的频率依赖性。

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  • 作者

    Kwok, KW; Chan, HLW; Choy, CL;

  • 作者单位
  • 年度 1997
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  • 原文格式 PDF
  • 正文语种 en
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