Recovery of two-phase microstructures of planarisotropic elasticcomposites

Tomasz Mariusz Łukasiak

Abstract

The isotropic elastic mixtures composed of two isotropic materials of the bulk moduli (2>1) and shear moduli (2>1) are characterized by the effective bulk and shear moduli * and *. In the planar problems the theoretically admissible pairs (*, *), for given volume fraction ��0 of material (2, 2), lie within a rectangular domain of vertices determined by the Hashin-Shtrikman bounds. The tightest bounds in 2D known up till now are due to Cherkaev and Gibiansky (CG). The microstructures corresponding to the interior of the CG area can be of arbitrary rank, in the meaning of the hierarchical homogenization. In the present paper a family of composites is constructed of the underlying microstructures of rank 1. The consideration is confined to the microstructures possessing rotational symmetry of angle 120. To find the effective moduli (*, *) the homogenization method is used: the local basic cell problems are set on a cell Y of the shape of a hexagonal domain. The periodicity conditions refer to the opposite sides of Y. Such a non-conventional basic cell choice generates automatically the family of isotropic mixtures. The subsequent points (*, *) are found by solving the inverse homogenization problems with the isoperimetric condition expressing the amounts of both the materials within the cell. The isotropy conditions, usually explicitly introduced into the inverse homogenization formulation, do not appear, as being fulfilled by the microstructure construction. The method put forward makes it possible to localize each admissible pair (*, *) by appropriate choice of the layout of both the constituents within the repetitive sub-domain of Y.
Author Tomasz Mariusz Łukasiak (FCE / ICE)
Tomasz Mariusz Łukasiak,,
- The Institute of Civil Engineering
Pages5367-5367 [abstract] + 1-10 [CD]
Publication size in sheets268.35
Book 10th World Congress on Structural and Multidisciplinary Optimization. Abstract book. [+CD] - WCSMO, 2013, Orlando,FL, Renaissance Orlando
Keywords in Englishisotropic composites, inverse homogenization, recovery of microstructures.
URL http://www.issmo.net/wcsmo10/Papers/5367.pdf
Languageen angielski
File
5367.pdf 1.3 MB
Score (nominal)15
ScoreMinisterial score = 10.0, 05-09-2019, BookChapterMatConfByConferenceseries
Ministerial score (2013-2016) = 15.0, 05-09-2019, BookChapterMatConfByConferenceseries
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