考虑非等长应变的磁电层合材料低频磁电响应特性

本文提出了一种考虑非等长应变的磁电层合材料低频磁电响应模型.该模型以剪切应力传递应变为基础,采用应力函数法分析了磁致伸缩层、压电层的应力和应变,利用粘接处的应变相等,求出了开路状态下磁电层合材料L-T模式的低频磁电响应特性.该模型能研究磁致伸缩材料的柔顺系数、压磁系数、层合比、压电材料的机电耦合系数、压电系数等参数对磁电电压系数的影响,并与等效电路法、两种考虑退磁场的等效电路法以及实验结果进行了对比研究.针对Terfenol-D/PZT/Terfenol-D的研究结果表明:理论结果与实验结果误差为5.42%,与其他方法相比,本文的结果与实验结果吻合得更好.

Low-frequency magnetic response characteristics of magnetoelectric laminate composites considering non-isometric strain

This paper presents a low-frequency magnetoelectric response model of magnetoelectric laminate composites considering non-isometric strain. The stress and strain of the magnetostrictive and piezoelectric layers are analyzed by the stress function based on the shear stress transferring strain. Under the open circuit condition, low-frequency magnetoelectric response characteristics of the magnetoelectric laminate composites working on L-T mode are obtained by using equal strain at the adhesive surface of composites. This model can be used to analyze the impact of multiple parameters on the magnetoelectric voltage coefficient, such as the compliance coefficient, piezoelectric coefficient, thickness ratio of the magnetostrictive material and the magnetomechanical coupling coefficient, piezoelectric coefficient of the piezoelectric material. The theoretical results of this paper were compared with that of the equivalent circuit method, two equivalent circuit method consideration of demagnetization and the experiment. The experimental results of the Terfenol-D/PZT/Terfenol-D laminates show that the theoretical and experimental results error is 5.42% and the theoretical results of this paper are better agree with the experimental results than that of other methods.