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Simulation des distorsions de cuisson de pièces composites élaborées par co-bonding en autoclave

Abstract : Because of their specific properties, composite laminates made of carbon and thermosetting resins are very efficient materials for primary structural parts in aeronautics. However, during their cure, composite parts are subjected to several multi-physical phenomena, which may cause residual stresses and strains that will impact the final geometry of the part. Those variations of geometry are critical for parts of large dimensions and assemblies. Therefore, a simulation tool is needed to predict the cure strains. The work conducted during this Ph.D. is part of the MAESTRIA project of the CORAC supervised by the DGAC and is undertaken as a part of a strong partnership with Dassault Aviation. In this research work a special interest is given to co-bonded assemblies. The epoxy adhesive film used has its own behaviour and may have an influence on cure strains of assemblies. The adhesive, often ignored in cure simulations, is thus subjected to its own characterization and modelling. A significant characterization work is done to identify the behaviour laws of materials throughout their cure. Based on this characterization work, a FEA model is implemented on Abaqus using FORTRAN user subroutines. The model is then compared to experimental measurements for validation. Distortion measurements are done on composite plates, corners and assemblies. The model provides accurate results for composite parts, however, the measurements obtained for assemblies revealed an adhesive behavior more complex than expected and a significant influence of the adhesive film on distortions. Therefore, the last part of this research work focuses on understanding and in-depth studying of the behavior of this adhesive film. To do so, various analyses are carried out, including cure monitoring of co-bonded assemblages by optical fibre grated with Bragg gratings.
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Submitted on : Monday, July 20, 2020 - 3:58:12 PM
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  • HAL Id : tel-02903049, version 1


Laure Moretti. Simulation des distorsions de cuisson de pièces composites élaborées par co-bonding en autoclave. Matériaux. Ecole des Mines d'Albi-Carmaux, 2019. Français. ⟨NNT : 2019EMAC0009⟩. ⟨tel-02903049⟩



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