Finite element modelling of the actual structure of cellular materials determined by X-ray tomography

The initial microstructure and local deformation mechanisms of a polyurethane foam during a compression test are investigated by means of X-ray microtomography. A methodology to mesh the actual solid volume is described. The polymer material behaviour is assumed to be elastoplastic. A predictive finite element modelling of the mechanical behaviour of cellular materials is then implemented. The validation of the modelling procedure is performed ill relation to the macroscopic mechanical response as well! as to the local deformation mechanisms observed during the experiments. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.