High frequency multi-field continualization scheme for layered magneto-electro-elastic materials

Magneto-electro-elastic (MEE) heterogeneous materials with periodic microstructure are investigated, with special focus on the particular case of a layered MEE material. By exploiting the transfer matrix method in combination with the Floquet-Bloch boundary conditions, the frequency dispersion spectrum can be derived by solving an eigenproblem, involving a 12 x 12 transfer matrix with palindromic characteristic polynomial. In particular, by assuming the cubic symmetry of layers, the problems involving longitudinal and transverse elastic waves are uncoupled. This circumstance has the advantage of simplifying the treatment and the size of the subproblems to be solved, corresponding to a 4 x 4 transfer matrix for the longitudinal case, and a 8 x 8 transfer matrix of the transverse problem, both characterized by palindromic characteristic polynomials. Afterward, a dynamic multi-field continualization approach is proposed to investigate wave propagation in MEE layered periodic material by matching the Z-transform of the vector collecting the nodal fields to the twosided Laplace transform of the same vector at the macroscale. The continualization technique allows identifying multi-field integral-type non-local continua as well as multi-field generalized gradient-type (higher-order) non local continua. Finally, to verify the accuracy of the proposed approach, the dispersion curves derived from the continualization technique are compared with the curves provided by the Floquet-Bloch theory.

Automated summary

In this study, the magneto-electro-elastic (MEE) heterogeneous materials with periodic microstructure, specifically the layered MEE material, are investigated. The frequency dispersion spectrum is derived using the transfer matrix method and Floquet-Bloch boundary conditions, and an eigenproblem involving a 12 x 12 transfer matrix is solved. The problems of longitudinal and transverse elastic waves are uncoupled by assuming the cubic symmetry of layers, simplifying the treatment and subproblems to be solved.