Paper number 314
|FAILURE BEHAVIOR OF 3D-BRAIDED COMPOSITES MODELING BY A MULTI-SCALE VARIATIONAL APPROACH|
D. Bigaud, P. Hamelin
Laboratoire Mécanique Matériaux L2M, Université Claude Bernard Lyon I
43 blvd du 11 novembre 1918, 69622 Villeurbanne Cedex, France
|Summary||The purpose of this paper is to present the failure behavior modeling of 3D-braided composites. Two main parameters are considered to be predominant on the failure behavior; 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.
A preliminary work has been done to identify the internal geometry of the braided composites. Once achieved, we propose a sub-cell modeling solution based on a multi-scale analysis allowing to locate and quantify the material rate and mechanical influence of each constituent (fiber or resin) within the composite. The analysis of the braided composite mechanical behavior finally consists in studying that of an aggregate of multi-scale sub-cells with individual properties. Theoretical results obtained show a good agreement with experiments carried out on a Carbon / PA12 3D-braided composite.
|Keywords|| failure of 3D composites, braided composites, homogenization, variational principles.
Theme : Textiles ; Braided Structures
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