The Coupling Model And Finite Element Analysis Of Multiferroic Composites

Multiferroic materials is an important functional materials, which has broad application prospects in modern science and technology. This thesis focus on magnetoelectric(ME) effect under different connectivity options, studying the effection of the boundary conditions, the volume fraction of each phase, the interface strength to the ME properties and mechanical propertiesFirst, In order to predict the influences of interfaces on ME coupling, a finite element model for multiferroics composites is suggested by employing cohesive zone elements for the interfaces. Piezoelectric elements are utilized for both piezoelectric and piezomagnetic phase based on the analogy between piezoelectric and piezomagnetic constitutive relations.Second, make a rigorous simulation analysis for the magnetic detector, and compare the results with the literature to verify the feasibility and accuracy of ABAQUS magnetoelectric simulation.Finally, several boundary conditions of 2-2 and 1-3 multiferroics composites are proposed, then we make an Analysis to ME effect of multiferroic composites under different boundary conditions, and make a simulation of ideal and non-ideal interface state by adjusting the parameters of CZM, In addition, for 2-2 layered magnetoelectric composites, we calculate the ME coefficient under different volume fraction of magnetostrictive phase, describe the breaking process in the weak interface; for 1-3 cylindrical magnetoelectric composites, we calculate the ME coefficient under different volume fraction of piezoelectric phase, and disscuss the influences of changing the overall thickness on the ME coefficientThe present method and results are significance to process of interfacial bonding and prediction of ME properties.