Univalent $\sigma$-harmonic mappings : applications to composites

Alessandrini, Giovanni; Nesi, Vincenzo

ESAIM: Control, Optimisation and Calculus of Variations, Tome 7 (2002), pp. 379-406.

This paper is part of a larger project initiated with [2]. The final aim of the present paper is to give bounds for the homogenized (or effective) conductivity in two dimensional linear conductivity. The main focus is therefore the periodic setting. We prove new variational principles that are shown to be of interest in finding bounds on the homogenized conductivity. Our results unify previous approaches by the second author and make transparent the central role of quasiconformal mappings in all the two dimensional $G$-closure problems in conductivity.

Classification : 35B27, 74A40, 74Q20, 30C62
Mots clés : effective properties, harmonic mappings, composite materials, quasiregular mappings

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