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Minimizers for a double-well problem with affine boundary conditions

Published online by Cambridge University Press:  14 November 2011

Grégoire Allaire  and
Véronique Lods
Grégoire Allaire
Affiliation:
Laboratoire d'Analyse Numérique, Université Paris 6, 75252 Paris Cedex 05, France
Véronique Lods
Affiliation:
Laboratoire d'Analyse Numérique, Université Paris 6, 75252 Paris Cedex 05, France
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Abstract

This paper is concerned with the existence of minimizers for functionals having a double-well integrand with affine boundary conditions. Such functionals are related to the so-called Kohn–Strang functional, which arises in optimal shape design problems in electrostatics or elasticity. They are known to be not quasiconvex, and therefore existence of minimizers is, in general, guaranteed only for their quasiconvex envelopes. We generalize the previous results of Allaire and Francfort, and give necessary and sufficient conditions on the affine boundary conditions for existence of minimizers. Our method relies on the computation of the quasiconvexification of these functionals by using homogenization theory. We also prove by a general argument that their rank-one convexifications coincide with their quasiconvexifications.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , Volume 129 , Issue 3 , 1999 , pp. 439 - 466
Copyright
Copyright © Royal Society of Edinburgh 1999

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