夹持效应对层状磁电复合材料磁电效应的影响

Influence of clamping effect on magenetoelectric effect of magnetoelectric laminated composites

设计了Terfenol-D/PZT/Terfenol-D(T/P/T)、Terfenol-D/PZT(T/P)、Terfenol-D/PZT/Glass(T/P/G)3种不同结构的层状磁电复合材料,研究了夹持效应对其振动模式的调控作用及其磁电效应的影响。结果表明,对称结构只有长度振动模式,而非对称结构同时具有弯曲振动和长度振动模式;夹持效应使两种共振模式的共振频率均向高频方向移动;夹持效应提高了低共振频率下的一阶弯曲振动强度;在准静态频率下,T/P/G结构的磁电耦合系数有最大值0.89V/(cm·Oe)。在低频下,弯曲振动模式占主导地位,同时夹持效应显著抑制了长度振动模式,该两种振动模式引起的磁电效应相反,从而使得总磁电耦合系数得到提高,所以夹持效应提高了器件在低频应用的可能性。

In this article, magnetoelectric laminated composites, including Terfenol-D/PZT/Terfenol-D （T/P/ T）, Terfenol-D/PZT （T/P） and Terdenol-D/PZT/Glass （T/P/G） were fabricated and the clamping effect on vibration mode and magnetoelectric effect of which were investigated. The results show that there is only length vibration mode for symmetry structure whereas asymmetric one has bend mode and length mode concurrently. Clamping effect can drive the resonate frequency of these two vibration modes toward high frequency and enhance the intensity of first-order bend vibration mode at low resonance frequency. The maximum magnetoelectric coefficient of T/P/G can reach 0.89 V/（cm . Oe） under quasi-static frequency. At low frequency, the bend vibration mode is the dominant one between the two vibration modes and clamping effect can restrict the length vibration mode significantly. Hence, there is an enhancement of the total magnetoelectric effect because the two vibration modes have inverse effect on it, which is of significance for the application of magnetoelectric devices at low frequency.