A variational approach to the local character of G-closure: the convex case

Details A variational approach to the local character of G-closure: the convex case A variational approach to the local character of G-closure: the convex case

2007-03-14

arxiv.org/abs/math/0703419v2

Mathematics

Analysis of PDEs

24 pages, 1 figure

Scientific paper

This article is devoted to characterize all possible effective behaviors of composite materials by means of periodic homogenization. This is known as a $G$-closure problem. Under convexity and $p$-growth conditions ($p>1$), it is proved that all such possible effective energy densities obtained by a $\Gamma$-convergence analysis, can be locally recovered by the pointwise limit of a sequence of periodic homogenized energy densities with prescribed volume fractions. A weaker locality result is also provided without any kind of convexity assumption and the zero level set of effective energy densities is characterized in terms of Young measures. A similar result is given for cell integrands which enables to propose new counter-examples to the validity of the cell formula in the nonconvex case and to the continuity of the determinant with respect to the two-scale convergence.

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