Abstract
In this study, a novel functionally graded cylindrical magnetoelectric (ME) composite based on d15 shear-mode response is analyzed theoretical by using the elastic mechanics model and equivalent circuit model. The composite is mounted around AC current-carrying power lines to scavenge AC magnetic field energy. For different sensing configurations, the generated magnetic fields are calculated, respectively. Then, based on the theoretical models, the dependences of the ME performances, i.e., the ME voltage and power, upon the type of the material gradation, the material constants, and geometrical parameters of the cylindrical ME composite are numerically evaluated. The results show that the ME coupling effect in the functionally graded cylindrical ME composite with special gradation is stronger than that in the homogeneous structure. The ME performance can be improved by geometrical parameters as well. The presented two models can be synthesized under the open-circuit condition, which provide a theoretical basis to understand and improve the ME property of the d15 shear-mode cylindrical ME composites operating at resonant frequency and off-resonance frequency.
Highlights
Magnetoelectric (ME) effect is generally defined as the induced polarization of single-phase materials or composites in an applied magnetic field or vice versa.[1,2] The ME effect was first found in single-phase crystal families as early as 1960s,3 the intrinsic ME coupling in these materials is observable only at very low temperature and extremely weak.[4]
When the frequency-dependent ME voltage is investigated, the mechanical loss in piezoelectric materials can be described using a complex elastic constant, and the elastic compliance constant s55 is replaced by s55(1 j/Qm) in our calculations.[24]
We have established theoretical models for the Functionally graded (FG) cylindrical ME composites based on d15 shear-mode response
Summary
Magnetoelectric (ME) effect is generally defined as the induced polarization of single-phase materials or composites in an applied magnetic field or vice versa.[1,2] The ME effect was first found in single-phase crystal families as early as 1960s,3 the intrinsic ME coupling in these materials is observable only at very low temperature and extremely weak.[4]. In consideration of the reported excellent ME property in the piezoelectric/magnet composite cantilever, some modified piezoelectric/magnet composites were subsequently demonstrated in a series of experiments.[21,22] Theoretically, equivalent circuit model[23,24] and elastic mechanics model[25] have been developed to study the dynamic and low-frequency ME coupling behaviors of the ME composite cantilever These studies pointed out that ME performance can be optimized by adjusting the geometrical parameters for meeting the needs of practical applications. To address the abovementioned issues, a novel cylindrical torsional ME composites based on d15 shear-mode response has been presented, in which a large ME coefficient of 28.8 mV Oe-1 outside resonance has been obtained with zero bias field.[28] The composite was theoretically expected to be optimized by geometric parameters and material constants under low frequency.
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