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Effective medium theory for the elastic properties of composite materials with various percolation thresholds

  • It is discussed that the classical effective medium theory for the elastic properties of random heterogeneous materials is not congruous with the effective medium theory for the electrical conductivity. In particular, when describing the elastic and electro-conductive properties of a strongly inhomogeneous two-phase composite material, the steep rise of effective parameters occurs at different concentrations. To achieve the logical concordance between the cross-property relations, a modification of the effective medium theory of the elastic properties is introduced. It is shown that the qualitative conclusions of the theory do not change, while a possibility of describing a broader class of composite materials with various percolation thresholds arises. It is determined under what conditions there is an elasticity theory analogue of the Dykhne formula for the effective conductivity. The theoretical results are supported by known experiments and show improvement over the existing approach. The introduction of the theory with the variable percolation threshold paves the way for describing the magnetorheological properties of magnetoactive elastomers. A similar approach has been recently used for the description of magneto-dielectric and magnetic properties.

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Metadaten
Author:Andrei A. SnarskiiORCiD, Mikhail Shamonin (Chamonine)ORCiDGND, Pavel Yuskevich
DOI:https://doi.org/10.3390/ma13051243
Parent Title (English):Materials
Publisher:MPDI
Place of publication:Basel
Document Type:Article
Language:English
Year of first Publication:2020
Release Date:2022/01/14
Tag:effective medium approximation; elastic properties; percolation threshold; random heterogeneous medium; self-consistent; two-phase composite material
Volume:13
Issue:5
Article Number:1243
First Page:1
Last Page:19
Institutes:Fakultät Elektro- und Informationstechnik
Fakultät Elektro- und Informationstechnik / Labor Intelligente Materialien und Strukturen
Begutachtungsstatus:peer-reviewed
OpenAccess Publikationsweg:Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium
research focus:Energie und Mobilität
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International