Finite Element Analysis Of The Magnetoelectric Composite With Elastic Substrate

Magnetoelectric composites can interconvert energies between magnetic field and electric field, and can be applied in magnetic field detection, microwave leak monitoring and electromagnetic field energy conversion. The laminate composites have higher magnetoelectric voltage coefficients than the particle composites. The magnetoelectric composite of three phases by bonding the laminated magnetostrictive and piezoelectric materials onto an elastic substrate has been proposed by our research group. Compared with the two-phase magnetostrictive-piezoelectric laminate composite, it has higher magnetoelectric voltage coefficient at resonance. In this paper, the magnetoelectric performances of two composites are studied by finite element analysis, one with constant section substrate and another with sharp wedge-shaped substrate. The main work is as follows:1. The finite element analysis model of magnetostrictive effect is established in a way analogy to that of piezoelectric effect for the finite element analysis of the magnetoelectric effect of the magnetoelectric composite with elastic substrate. The finite element models of these two kinds of magnetoelectric composites are established by inputting geometric model, selecting element types, meshing solid model, applying loads and applying boundary conditions.2. These two kinds of magnetoelectric composites are analyzed by finite element method. The influences of the composites'parameters'variation on the magnetoelectric characteristics of the composites are studied. The composites are optimized in terms of maximizing the magnetoelectric voltage coefficients. For the magnetoelectric composite with constant section substrate, the influences of the length of the piezoelectric material, the length of the substrate, the mechanical quality factor of the substrate, and the width of the composite on the magnetoelectric characteristics of the composites are studied, at first-order longitudinal resonance. For the magnetoelectric composite with sharp wedge-shaped substrate, the influences of the position, the length and the width of the piezoelectric material, and the bottom width of the substrate on the magnetoelectric characteristics of the composites are studied, at longitudinal resonance. Compared with the constant section substrate composite, the energy-concentrated effect of the sharp wedge-shaped substrate composite is validated. Because of the flexural resonance, these two kinds of composites'magnetoelectric voltages varying with the frequency of the driving signal both have multiple peaks.3. The devices of these two kinds of magnetoelectric composites are prepared. And the magnetoelectric response measure system is established. The magnetoelectric performances of the devices are measured. Compared with the experimental results, finite element analysis can predict the harmonic frequency and the variation of the magnetoelectric voltage of the composite exactly. The optimal composite has higher magnetoelectric voltage coefficient, which is optimized by finite element analysis. The finite element method provides guidance for designing and optimizing the similar composites.