Abstract
By a suitable reformulation of a typical optimal design problem in conductivity, we treat the issue of determining the quasiconvexification (to fixed volume fraction) of certain sets of matrices that are union of two manifolds. By means of a helpful lemma, we are able to explicitly compute such hulls in a rather straightforward fashion without the need of seeking laminates by hand, and hence avoiding some tedious computations. We examine the linear case, both elliptic and hyperbolic, in 2 and higher dimension (by looking at a div–curl situation), as well as an interesting non-linear example that provides some clue as to what kind of characterization one may hope for in non-linear situations.
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This work was supported by the research projects MTM2007-62945 of the MCyT (Spain) and PCI08-0084-0424 of the JCCM (Castilla-La Mancha).
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Boussaid, O., Pedregal, P. Quasiconvexification of sets in optimal design. Calc. Var. 34, 139–152 (2009). https://doi.org/10.1007/s00526-008-0178-1
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DOI: https://doi.org/10.1007/s00526-008-0178-1