Micromorphic two-scale modelling of periodic grid structures
Artikel i vetenskaplig tidskrift, 2013

The present contribution focuses on the numerical homogenization of periodic grid structures. In order to investigate the micro-to-macroscale transition, a consistent numerical homogenization scheme will be presented, replacing a heterogeneous Cauchy microcontinuum by a homogeneous micromorphic substitute continuum on the macroscale. The extended degrees of freedom, namely, the microdeformation and its gradient, are to be interpreted in terms of geometrical deformation modes and the related loading conditions of the underlying unit cells. Assuming strain energy equivalence of the macro- and the microscale, the effective constitutive properties of a square and a honeycomb grid structure are identified and quantitatively validated in comparison to reference calculations with microscopic resolution.

FE2 method

micromorphic media

cellular materials

size effects

homogenization

Författare

Ralf Jänicke

Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

H. Georg Sehlhorst

Alexander Düster

Stefan Diebels

International Journal for Multiscale Computational Engineering

1543-1649 (ISSN)

Vol. 11 2 161-176

Ämneskategorier

Teknisk mekanik

Samhällsbyggnadsteknik

DOI

10.1615/IntJMultCompEng.2012003279