Abstract
Abstract
The failure behaviour modelling of three-dimensional Cartesian braided composites is presented. Two main parameters are considered to be predominant in the failure behaviour: the variations of the yarns orientation, which generates a complex field of stresses, and the scattering of internal values of strength partly due to damages induced in the yarn during the manufacturing and consolidation steps. Thus, the internal geometry of the braided composite first needs to be identified. A subcell modelling solution based on a multiscale analysis allowing the mechanical influence of each constituent (fibre or resin) to be considered within the composite is next proposed. Finally, the analysis of the braided composite mechanical behaviour leads to the study of an aggregate of multiscale subcells with randomly distributed individual mechanical properties. The theoretical results obtained show good agreement with the experiments carried out on carbon/PA 12 three-dimensional Cartesian braided composites.
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