Composites Preforms Simulations for Helicopters Parts

The performance of composite materials in structural aeronautical applications is routinely demonstrated. The structures of advanced helicopters mainly consist of Fibre Reinforced Plastics. Nowadays the huge majority of the structural parts is based on standard pre-preg design and manufacturing technology. In this study we present an alternative based on the preforming of a dry reinforcement and the infusion of this preform with resin. We’ve analysed the deformation modes of non-crimp fabrics which are used in those new processes. Behaviour during the variation of orientation of fibres (assimilated to in-plane shear) appears of utmost importance in order to study this performing. The defects which occur on real case are presented helping us to understand the mechanical behaviour of the material. We’ve then begun to set up a numerical simulation of the performing of a structural part for a helicopter.