Effective Properties of Multi-layered Multi-functional Composites

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 a...

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Bibliographic Details
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
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Summary: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.
ISSN:0924-3046
1568-5519
DOI:10.1163/156855109X428817