Micromechanical analysis of effective properties of magneto-electro-thermo-elastic multilayer composites

• Published in: International journal of engineering science Vol. 49; no. 9; pp. 1001 - 1018
• Main Author: Kim, Jin-Yeon
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.09.2011; Elsevier
• Subjects: Anisotropy; Asymptotic properties; Effective property; Entropy; Exact sciences and technology; Exact solutions; Fundamental areas of phenomenology (including applications); Homogenizing; Magnetic properties; Magnetoelectric effect; Mathematical models; Multilayer composite; Multilayers; Physics; Pyroelectric effect; Pyromagnetic effect; Smart composites; Solid mechanics; Static elasticity (thermoelasticity...); Structural and continuum mechanics; Magnetoelectric effect; Pyroelectric effect; Smart composites; Pyromagnetic effect; Multilayer composite; Effective property; Elastic constant; Entropy; Barium titanates; Porous material; Modeling; Composite material; Optimization; Micromechanics; Functionnally graded material; Piezoelectricity; Magnetoelastic effect; Crystallographic direction; Stratified material; Deformation modulus; Thermomechanical properties; Electroelasticity; Poroelasticity; Homogenization methods; Matrix method; Thermoelasticity; Magnetomechanical properties; Asymptotic approximation; Microstructure; Effective medium model; Cobalt compound; Electromechanical properties
• ISSN: 0020-7225; 1879-2197
• DOI: 10.1016/j.ijengsci.2011.05.012

An exact matrix method, originally proposed for evaluating effective elastic constants of generally anisotropic multilayer composites, is further developed for a micromechanical analysis of multilayers with various coupled physical effects including piezoelectricity, piezomagnetism, thermoelasticity (in consideration of entropy), and the Biot’s poroelasticity. The results for a BaTiO 3–CoFe 2O 4 magneto-electro-thermo-elastic (METE) multilayer coincide with those calculated using other micromechanical models based on the Mori–Tanaka method and the asymptotic homogenization method. It is shown that the present method can efficiently handle the most general type of multilayers with an arbitrary number of general anisotropic layers. Analytical expressions for effective material properties of a transversely isotropic METE multilayer composite are derived, from which those for functionally graded METE multilayers can be directly obtained. The effects of crystallographic orientations and volume fractions of constituting layers on the magnetoelectric coefficients are investigated for BaTiO 3–CoFe 2O 4 and LiNbO 3–CoFe 2O 4 multilayer composites. It is thus demonstrated that the present model can be used for the layout/material optimization of these METE multilayers to obtain a maximum product property such as the magnetoelectric, pyroelectric, and pyromagnetic coefficients. It is also shown that the same method can be used to predict the effective properties of poroelastic multilayers.