Effective Properties of Multi-layered Multi-functional Composites

• Published in: Advanced composite materials 2009-01, Vol.18 (2), p.153-166
• Main Authors: Kim, Byeong-Chan, Baltazar, Arturo, Kim, Jin-Yeon
• Format: Article
• Language: English
• Subjects: EFFECTIVE PROPERTY; MAGNETOELECTRIC EFFECT; MULTILAYER COMPOSITE; PIEZO-THERMOELASTIC EFFECT; SMART COMPOSITES
• ISSN: 0924-3046; 1568-5519
• DOI: 10.1163/156855109X428817

A matrix method for evaluating effective electro-magneto-thermo-elastic properties of a generally anisotropic multilayered composite is presented. Physical variables are categorized into two groups: one that satisfies the continuity across the interface between layers and another that satisfies an average interlayer compatibility (which is also exact). The coupled electro-magneto-thermo-elastic constitutive equation is accordingly reassembled into submatrices, which leads to the derivation of concise and exact matrix expressions for effective properties of a multilayered composite having the coupled physical effects. Comparing the results for a purely elastic multiplayer with those from other theoretical approaches validates the developed method. Examples are given for a PZT-graphite/epoxy composite and a BaTiO 3 -CoFe 2 O 4 multilayer which exhibit piezo-thermoelastic and magnetoelectric properties, respectively. The result shows how a strong magnetoelectric effect can be achieved by combining piezoelectric and piezomagnetic materials in a multilayered structure. The magnetoelectric coefficient of the BaTiO 3 -CoFe 2 O 4 multilayer is compared with those for fibrous and particulate composites fabricated with the same constituents.