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We provide in this paper homogenization results for the L2 -topology leading to complete strain-gradient models and generalized continua. Actually, we extend to the L2 -topology the results obtained in (Abdoul-Anziz &amp; Seppecher, 2018 Homogenization of periodic graph-based elastic structures.Journal de l’Ecole polytechnique–Mathématiques 5 , 259–288) using a topology adapted to minimization problems set in varying domains. Contrary to (Abdoul-Anziz &amp; Seppecher, 2018 Homogenization of periodic graph-based elastic structures.Journal de l’Ecole polytechnique–Mathématiques 5 , 259–288) we consider elastic lattices embedded in a soft elastic matrix. Thus our study is placed in the usual framework of homogenization. The contrast between the elastic stiffnesses of the matrix and the reinforcement zone is assumed to be very large. We prove that a suitable choice of the stiffness on the weak part ensures the compactness of minimizing sequences while the energy contained in the matrix disappears at the limit: the Γ-limit energies we obtain are identical to those obtained in (Abdoul-Anziz &amp; Seppecher, 2018 Homogenization of periodic graph-based elastic structures.Journal de l’Ecole polytechnique–Mathématiques 5 , 259–288).

Homogenization of an elastic material reinforced by very strong fibres arranged along a periodic lattice