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A remark about the periodic homogenization of certain composite fibered media

  • * Corresponding author: Ali Sili

    * Corresponding author: Ali Sili
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  • We explain in this paper the similarity arising in the homogenization process of some composite fibered media with the problem of the reduction of dimension $ 3d-1d $. More precisely, we highlight the fact that when the homogenization process leads to a local reduction of dimension, studying the homogenization problem in the reference configuration domain of the composite amounts to the study of the corresponding reduction of dimension in the reference cell. We give two examples in the framework of the thermal conduction problem: the first one concerns the reduction of dimension in a thin parallelepiped of size $ \varepsilon $ containing another thinner parallelepiped of size $ r_ \varepsilon \ll \varepsilon $ playing a role of a "hole". As in the homogenization, the one-dimensional limit problem involves a "strange term". In addition both limit problems have the same structure. In the second example, the geometry is similar but now we assume a high contrast between the conductivity (of order $ 1 $) in the small parallelepiped of size $ r_ \varepsilon : = r \varepsilon $, for some fixed $ r $ ($ 0 < r < \frac{1}{2} $) and the conductivity (of order $ \varepsilon^2 $) in the big parallelepiped of size $ \varepsilon $. We prove that the limit problem is a nonlocal problem and that it has the same structure as the corresponding periodic homogenized problem.

    Mathematics Subject Classification: Primary: 35B25, 35B27, 35B40; Secondary: 76M50, 74K10.


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