Experimental characterization and numerical modeling of damage at the mesoscopic scale of woven composites
Résumé
The mechanical behaviour of woven composites is modeled at the mesoscopic scale, taking into account the influence of the dry fabric preforming before resin injection, the relative shift and nesting between fabric layers, and the effect of yarn cracking and micro-decohesions at the yarn surface. The strain distributions observed at the composite surface are strongly influenced by the layer shift. A good agreement with strain distributions observed by Digital Image Correlation is obtained only if the layer shifts are similar to those observed in the real specimen. Mesoscopic damage is modeled by introducing discrete cracks in the Finite Element mesh of the Representative Unit Cell of the composite, similarly to the experimental observations. Therefore, the effects of mesoscopic scale damage on the macroscopic mechanical properties are evaluated. The numerical results show similar trends as the experimental data. However, in order to reach a quantitative agreement, the effect of micro-decohesions around the crack tips at the yarn surfaces have to be taken into account.
Domaines
Matériaux
Origine : Fichiers produits par l'(les) auteur(s)
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