Abstract
We use a micromechanics approach to study the magnetoelectric (ME) properties of the piezoelectric/magnetostrictive composite with a 2–2 laminate structure and a 3–1 fibrous structure. It is found that the 3–1 composite has a higher ME coefficient than the 2–2 one, if the volume ratio of piezoelectric material is the same. The reason is that the 3–1 fibrous composite makes use of the longitudinal piezoelectric response and the piezoelectric voltage constant g33 is 2–3 times that of g31. Generally, a smaller volume ratio of the piezoelectric material will generate a higher ME response. The tensile stress at the piezoelectric/magnetostrictive interface of the 3–1 fibrous composite, however, could be high enough to induce plastic deformation or microcracks, which leads to a ME coefficient lower than the theoretically predicted one.
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