Complete band gaps including non-local effects occur only in the relaxed micromorphic model

Angela Madeo (1, 2) , Patrizio Neff (3) , Marco Valerio d'Agostino (1) , Gabriele Barbagallo (4, 1)

1 LGCIE - Laboratoire de Génie Civil et d'Ingénierie Environnementale
2 IUF - Institut universitaire de France
3 Universität Duisburg-Essen = University of Duisburg-Essen [Essen]
4 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]

In this paper we substantiate the claim implicitly made in previous works that the relaxed micromorphic model is the only linear, isotropic, reversibly elastic, nonlocal generalized continuum model able to describe complete band-gaps on a phenomenological level. To this end, we recapitulate the response of the standard Mindlin-Eringen micromorphic model with the full micro-distortion gradient of P, the relaxed micromorphic model depending only on the Curl P of the micro-distortion P, and a variant of the standard micromorphic model in which the curvature depends only on the divergence Div P of the micro distortion. The Div-model has size-effects but the dispersion analysis for plane waves shows the incapability of that model to even produce a partial band gap. Combining the curvature to depend quadratically on Div P and Curl P shows that such a model is similar to the standard Mindlin-Eringen model which can eventually show only a partial band gap.

Mots clés: multi-scale modeling; band gaps; macroscopic consistency; homogenization; relaxed micromorphic model; Cauchy continuum; generalized continuum models; long wavelength limit

Domaines: Physique mathématique [math-ph]; Mécanique des solides [physics.class-ph]

Angela Madeo, Patrizio Neff, Marco Valerio d'Agostino, Gabriele Barbagallo. Complete band gaps including non-local effects occur only in the relaxed micromorphic model. Comptes Rendus Mécanique, 2016, 344 (11-12), pp.784-796. ⟨10.1016/j.crme.2016.07.002⟩. ⟨hal-01719611⟩