Homogenization of the core layer in stitched sandwich structures |
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Authors: | B Lascoup Z Aboura K Khellil M Benzeggagh |
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Affiliation: | 1. ESTACA Campus ouest, Laboratoire Structure et Matériaux, Rue Georges Charpak, 53000 Laval, France;2. Université de Technologie de Compiègne, Laboratoire de Mécanique Roberval UMR CNRS 6253, Dept GM, Polymères et Composites, BP 20529, 60206 Compiègne Cedex, France |
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Abstract: | After highlighting the improvement of the mechanical performances involved by transverse reinforcement implementation in previous several studies, the mechanical behavior of stitched sandwich structures is analytically approached in this paper. The final purpose of this work is a modeling of the elastic performances of these structures. To predict the in-plane behavior, the classical theory of sandwiches is adapted and used by treating the foam core strengthened by stitches as a homogenized volume. This approach leads to the creation of an orthotropic equivalent core material. Its elastic properties depend on each component and their volume participation. The comparison between simulated and experimental values is quite good. The main interest of the multi-scale approach concerns a predictive tool. Indeed, it becomes realistic to obtain the elastic properties of stitched sandwich according to the geometrical parameters of the stitches and the mechanical properties of the components. |
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Keywords: | A Sandwich B Mechanical properties C Elastic modeling Stitch |
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