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Abstract: The torsional effect of piezoelectric quartz wafer is first
investigated. The torsional theory of circular quartz is deduced by
using the anisotropic elasticity and Maxwell electromagnetic theory,
then the stress field and electrostatic field is founded. The
distribution of the electric field in the piezoelectric body is obtained
by the finite element method. Based on theoretical analysis of the bound
charge distribution, the measuring electrodes are effectively disposed
on the surfaces of the piezoelectric body. As the result, the polar
charge is linear with the torque. A satisfactory agreement is obtained
between the computed results and experimental results. The analysis
provides the basis for the torque measuring technique on the single
circular piezoelectric quartz.
Key
words: Piezoelectricity
Torsional effect Nonlinear polarization Anisotropy
CLC No: O738
高等学校博士学科点专项科研基金资助项目(980140106，20010141006).
Received 20030530, received in revised form 20031018
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