Homogenization of high-contrast Mumford-Shah energies

2018/07/23 by Pellet, Xavier, Scardia, Lucia, Zeppieri, Caterina Ida
#49J45 #49Q20 #74Q05 #Analysis of PDEs (math.AP) #FOS: Mathematics

paper · doi:10.48550/arxiv.1807.08705

Abstract

We prove a homogenization result for Mumford-Shah-type energies associated to a brittle composite material with weak inclusions distributed periodically at a scale ε>0. The matrix and the inclusions in the material have the same elastic moduli but very different toughness moduli, with the ratio of the toughness modulus in the matrix and in the inclusions being 1/β_ε, with β_ε>0 small. We show that the high-contrast behaviour of the composite leads to the emergence of interesting effects in the limit: The volume and surface energy densities interact by Γ-convergence, and the limit volume energy is not a quadratic form in the critical scaling β_ε = ε, unlike the ε-energies, and unlike the extremal limit cases.

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