A micromechanics-based mesomodel for unidirectional laminates in compression

Nicolas Feld (1) , Olivier Allix (1) , Emmanuel Baranger (1) , Jean-Mathieu Guimard (2)

1 LMT - Laboratoire de Mécanique et Technologie
2 EADS IW - EADS Innovation Works [Suresnes]

This work introduces an enriched description of a mesomodel for laminates in compression. The improvements are based on micromechanical studies of the kinking phenomenon. Several sources of kinking-induced nonlinearities, geometric and material, are selected for integration in the mesomodel. For this purpose, a constitutive homogenization strategy based on energies conservation is proposed and a new energetic potential is defined for the composite ply. The method is illustrated with the full identification of the reponse of a T300/GSL-914C UD ply. Simple laws and couplings are defined and allow for an accurate reproduction the microstructure's behavior. Further, the statistical waviness of the fibers is explicitly integrated in the model and can be used as a probabilistic parameter for mesoscale simulations.

Mots clés: matériaux composites

Domaines: Mécanique des matériaux [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

Nicolas Feld, Olivier Allix, Emmanuel Baranger, Jean-Mathieu Guimard. A micromechanics-based mesomodel for unidirectional laminates in compression. 3rd ECCOMAS Thematic Conference on the Mechanical Response of Composites, Sep 2011, Hannover, Germany. pp.61-68. ⟨hal-00667171⟩