Effective conductivity of a nonlinear differential laminate assemblage
Résumé
We derive closed-form expressions for the effective conductivity of a class
of powerlaw “differential” laminates in arbitrary dimension, studied in previous
works (Idiart et al, 2013). Emphasis is put on the weakly and strongly nonlinear
regimes, and on the asymptotic behavior of such composite in the “dilute limit”
of a vanishingly small volume fraction of one of the two phases. In the strongly
nonlinear limit, we examine the behavior of these solutions as the partial derivative
equations loose ellipticity. The domain of validity of the resulting expressions are
examined, and we provide a geometric interpretation of the results, relevant to field
localization. The behavior of the solutions at increasing dimensions, and whether
they could represent bounds is examined.