Magnetoelectric analysis of a bilayer piezoelectric/magnetostrictive composite system with interfacial effect

A magnetoelectric (ME) coupling model to analyze the influence of the interfacial properties on the ME behaviors of a bilayer composite system which consisting magnetostrictive (MS) and piezoelectric (PE) layers and works in bend mode are investigated in this article, and the closed form analytical solution is presented. The interface of the bilayer system between MS and PE layer is assumed to be imperfectly connected and is modeled by the shear-lag model. A sixth-order differential equation governing the displacement is derived and its analytical solution is derived. The effect of interfacial property on the static and dynamic ME behaviors includes the average output electrical power density of vibration-based ME bilayer system is discussed. The present analytic results can be degenerated to the ones for a bilayer system with perfect interfaces. It can be found that the interfacial properties play a critical role in the performance characteristics of the ME bilayer system. A quite different feature from previous work is that the static ME effect founded to be length size-dependent. The potential applications of this theoretical analysis can be found in evaluating the performance of the MS–PE composite with imperfectly interface.