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 do not appear able to manufacture thick parts with this material. The aim of my PhD thesis 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 carry out the step of deformation when the matrix is in the rubbery state to promote inter-ply sliding and thus avoiding the formation of wrinkling defect whatever the thickness. In a first step, the processing window suitable to obtain a preform was defined based on the physical properties of the PEEK matrix. The implementation of the proposed method, based on the results collected, has highlighted the complexity of the deformation mechanisms under these specific conditions. A better understanding of these mechanisms has been provided by a modeling and simulation approach. Finally, 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 process.
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Submitted on : Thursday, July 4, 2019 - 2:01:06 PM
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Lilian Martineau. Mise en forme de composites carbone/PEEK dans le domaine caoutchoutique. Matériaux. Ecole des Mines d'Albi-Carmaux, 2018. Français. ⟨NNT : 2018EMAC0008⟩. ⟨tel-02173334⟩

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