Piezoelectric fiber composites with interdigitated electrodes

被引:268
作者
Bent, AA
Hagood, NW
机构
[1] Continuum Control Corp, Cambridge, MA 02142 USA
[2] MIT, Act Mat & Struct Lab, Cambridge, MA 02139 USA
关键词
D O I
10.1177/1045389X9700801101
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Piezoelectric Fiber Composites were previously introduced as an alternative to monolithic piezoceramic wafers for structural actuation applications. This manuscript. was an investigation into the improvement of piezoelectric fiber composite performance through a nonconventional electroding scheme. Two microelectromechanical models were developed that predict the composite properties. These models were used to examine the trends of composite properties versus fiber volume fraction for various constituent materials. Several etched electrode PZT fiber composites, with fiber volume fractions ranging from 7% to 58%, were manufactured and tested. Experimental measurements showed excellent agreement with both the trends and magnitude of model predicted values. The maximum fiber volume fraction composites demonstrated a capacitance (epsilon(33)(T)/epsilon(0)) Of 550, piezoelectric free strain constants (d(33) and d(31)) Of 150 pm/V and -70 pm/V, and piezoelectric clamped stress (e(33)) of 5 C/m(2), showing a substantial improvement over previous piezoelectric fiber composites with uniform electrodes. Maximum strain values of 1700 ppm were measured, indicating higher in-plane actuation than monolithic piezoceramics.
引用
收藏
页码:903 / 919
页数:17
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