Generalized continuum overall modelling of periodic composite structures

Duy Khanh Trinh, Samuel Forest
Author affiliations

Authors

  • Duy Khanh Trinh MINES ParisTech Centre des mat\'eriaux, CNRS UMR 7633 BP 87, F-91003 Evry Cedex, France
  • Samuel Forest MINES ParisTech Centre des mat\'eriaux, CNRS UMR 7633 BP 87, F-91003 Evry Cedex, France

DOI:

https://doi.org/10.15625/0866-7136/33/4/258

Keywords:

Homogenization, strain gradient effects, periodic micro-structures, numerical prediction

Abstract

Classical homogenization methods fail to reproduce the overall response of composite structures when macroscopic strain gradients become significant. Generalized continuum models like Cosserat, strain gradient and micromorphic media, can be used to enhance the overall description of heterogeneous materials when the hypothesis of scale separation is not fulfilled. We show in the present work how the higher order elasticity moduli can be identified from suitable loading conditions applied to the unit cell of a periodic composite. The obtained homogeneous substitution generalized continuum is used then to predict the response of a composite structure subjected to various loading conditions. Reference finite element computations are performed on the structure taking all the heterogeneities into account. The overall substitution medium is shown to provide improved predictions compared to standard homogenization. In particular the additional boundary conditions required by generalized continua makes it possible to better represent the clamping conditions on the real structure.

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Published

12-12-2011

Issue

Section

Research Article