2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 1: Aifantis Intl. Symp. / Multiscale Material Mechanics
| Editors: | Kongoli F, Bordas S, Estrin Y |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 300 pages |
| ISBN: | 978-1-987820-24-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Influence Of Strain Gradient On Magnetoelectric Effect Of Piezoelectric/Piezomagnetic Fibrous Composites
K.Y. Xu1; Yan-mei Yue1;1SHANGHAI UNIVERSITY, Shanghai, China;
Type of Paper: Regular
Id Paper: 53
Topic: 1
Abstract:
The development of magnetic and electronic material has been penetrated in every field of modern technology. Owing to the trend of device miniaturization, multifunctional materials with the properties of electricity and magnetism have drawn increasing interest. Magnetoelectric (ME) structures composed of piezoelectric (PE) and piezomagnetic (PM) materials have the magneto-electro-elastic coupling property, with the ability to convert energy from one form (among magnetic, electric and mechanical energies) to the other. Because of the coupling effects, ME materials have significant application prospects in sensor technology, memory devices and smart structures. With development and industrial application of nanotechnology, more and more microminiaturized structures and systems are needed. However, the material properties may be different from that in macro-scale and also depend on material microstructures when the material characteristic size is as small as micron or nano. Such as the size-dependent phenomena of piezoelectric material were found in experiments, magnetic properties of piezomagnetic material are closely related to particle or grain size. Because no matter how to enhance ME effect, strain plays a key role in ME coupling. Motivated by this point and being eager to investigate the size-dependence phenomena, we introduce the strain gradient into the constitutive equations of multiferroic materials. Then ME fields have relation to the material internal length scales. The size-dependent phenomena in multiferroic composite may be analyzed and given an explanation.
In this paper, we firstly build the energy functional for elastic multiferroic body considering strain gradient effects. With the help of the variational principle, all the basic equations are established. Then we analyze the problem of multiferroic composite with inhomogeneities and obtain the effective ME coefficients. Finally, some numerical results of different multiferroic composites and a summary for size effects are presented. In conclusion, the internal length scales (or strain gradients) have significant influence on ME response in multiferroic composites. For the composites with different kind inhomogeneities, the effect of internal length scales is very different. By choosing appropriate inhomogeneity and controlling microstructure, high ME effects may be obtained. These results provide us potential possibilities for enhancing ME effects in the design and manufacture of multiferroic composites.
Keywords:
Composite; Electronic; Magnetic; Materials; Microscale; Nanoscale;References:
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