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Etudes expérimentales de l’influence des paramètres de conception des renforts NCF unidirectionnels sur leurs propriétés de transport et leurs performances mécaniques

Abstract : The energetic pricing of windmills involves the production cost of wind turbines and theirlifespan. Increasing the performances of these structures comes with an increase of the bladesdimensions. The spar caps of the latters, providing the strength to the blades, are made ofunidirectional glass fiber reinforcement known as NCF (Non-Crimp Fabrics). They involve two layers ofspecific orientations (0° and +/- 80°) stitched together. The architecture formed by the reinforcement isdependent on the design parameters which control the performance, on the fabric during the infusionprocess, and on the composite in the final structure. Therefore, the optimization of the NCF for thewindmill application is controlled by the design parameters. Three parameters (the stitch length, thestitch pattern and the weft Tex) are studied in order to establish the links morphology / process andmorphology / mechanical performances. Experimental investigations are undertaken to determine boththe hydraulic permeability tensor of the fabrics and the elastic properties of their composite. Thesemacroscopic properties are related to the morphology determined using images analysis technics. It isdemonstrated that each of the design parameters impacts the heterogeneity of the composite. Highheterogeneity allows improving the performance during the infusion process while reducing themechanical one. The optimization of the NCF using the design parameters requires setting acompromise in the heterogeneity of the architecture formed by the reinforcement. Another solutionwould consist in allowing the morphology to evolve during the infusion process, to go from an openstructure that eases the flow to a homogeneous structure safer for the windmill application.
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Boris Martin. Etudes expérimentales de l’influence des paramètres de conception des renforts NCF unidirectionnels sur leurs propriétés de transport et leurs performances mécaniques. Matériaux et structures en mécanique [physics.class-ph]. Ecole Nationale Supérieure des Mines de Paris, 2015. Français. ⟨NNT : 2015ENMP0084⟩. ⟨tel-02892123⟩

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