Characterization of the mechanical nonlinear behavior of piezoelectric ceramics
Characterization of the mechanical nonlinear behavior of piezoelectric ceramics
复制标题
压电陶瓷机械非线性行为的表征
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
D. Guyomar
中科院分区：
文献类型：
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作者：
A. Albareda;P. Gonnard;V. Perrin;R. Briot;D. Guyomar
对压电陶瓷谐振器在高信号激励下的非线性行为进行了表征。解释了功率器件工作在谐振状态下的行为，其中涉及高应变。前面描述的理论模型被用来解释动态阻抗的变化与动态电流的平方成正比。这种阻抗增加/spl Δ/Z与频率无关，并解释了：产生A-F效应的非线性弹性、在接近谐振时大幅增加的非线性机械损耗以及频率扫描产生的滞后现象。介绍了在强信号激励下测量压电陶瓷机械非线性系数的不同方法。提出了一种测量压电陶瓷材料的机械损耗角正切和柔度随均方应变变化的实验方法。这包括测量最大导纳和向下频率的串联谐振频率。在该跳变点处，无论激励的幅度如何，相位角都保持为零。推导了表征材料力学非线性的两个主要系数。对不同陶瓷材料在纵模和横模下的非线性进行了实验测量。
A characterization of the nonlinear behavior with high signal excitation in piezoceramic resonators was carried out. The behavior of power devices working at resonance, in which high strains are involved, is explained. A theoretical model previously described is used to explain the motional impedance variation proportional to the square of the motional current. This impedance increase /spl Delta/Z is independent of the frequency and explains: the nonlinear elasticity that produces the A-F effect, the nonlinear mechanical losses that increase greatly close to the resonance, and the hysteresis phenomenon produced with frequency sweeps. Different methods for measuring the mechanical nonlinear coefficients of piezoceramics with high signal excitation are presented. An experimental method is proposed to measure the mechanical loss tangent and the compliance variations as a function of the mean square strain in the piezoceramic. This consists in measuring the maximum admittance and the series resonance frequency for downward frequencies. At this jumping point, the phase angle remains zero whatever the amplitude of the excitation. Two main coefficients characterizing the material mechanical nonlinearity are deduced. Experimental measurements were carried out to compare the nonlinearity of different ceramic materials in longitudinal and transverse mode.