Geodesic
Is it wise to keep laminating ?
ESAIM: Control, Optimisation and Calculus of Variations, Tome 10 (2004) no. 4, pp. 452-477

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We study the corrector matrix P ϵ to the conductivity equations. We show that if P ϵ converges weakly to the identity, then for any laminate detP ϵ ≥0 at almost every point. This simple property is shown to be false for generic microgeometries if the dimension is greater than two in the work Briane et al. [Arch. Ration. Mech. Anal., to appear]. In two dimensions it holds true for any microgeometry as a corollary of the work in Alessandrini and Nesi [Arch. Ration. Mech. Anal. 158 (2001) 155-171]. We use this property of laminates to prove that, in any dimension, the classical Hashin-Shtrikman bounds are not attained by laminates, in certain regimes, when the number of phases is greater than two. In addition we establish new bounds for the effective conductivity, which are asymptotically optimal for mixtures of three isotropic phases among a certain class of microgeometries, including orthogonal laminates, which we then call quasiorthogonal.

DOI : 10.1051/cocv:2004015
Classification : 35B27, 74Q15
Keywords: homogenization, bounds, composites, laminates 
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     title = {Is it wise to keep laminating ?},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {452--477},
     publisher = {EDP-Sciences},
     volume = {10},
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Briane, Marc; Nesi, Vincenzo. Is it wise to keep laminating ?. ESAIM: Control, Optimisation and Calculus of Variations, Tome 10 (2004) no. 4, pp. 452-477. doi: 10.1051/cocv:2004015

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