Mise en forme de composites carbone/PEEK dans le domaine caoutchoutique

Abstract : Thermoplastic composite materials based on long carbon fibers are extensively studied to prepare their introduction in the next generation of structural parts in aerospace industry. Because of its thermomechanical properties, unidirectional carbon/PEEK appears as a potential candidate, however the current forming processes are not suitable to manufacture thick parts with this material. The aim of this work is to propose an innovative process to produce thick carbon/PEEK parts of L-shape and U-shape profiles. The heart of the concept is to performthe deformationstepatthe rubbery stateof the matrixto promote inter-ply sliding.Thus,the formation of wrinkling defectis preventedwhatever the thicknessof the part. In a first step, the processing window to obtain a preform was defined based on the physical properties of the PEEK matrix.Then, the material properties and the performance of the parts produced by this new process have been measured, the comparison with parts obtained by a conventional forming process validates the proposed route.
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Lilian Martineau, France Chabert, Gérard Bernhart, Benjamin Boniface. Mise en forme de composites carbone/PEEK dans le domaine caoutchoutique. JNC 21 : Journées Nationales sur les Composites 2019, École Nationale Supérieure d'Arts et Métiers (ENSAM) - Bordeaux, Jul 2019, Bordeaux, Talence, France. 10 p. ⟨hal-02420774⟩

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