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Énergies marines renouvelables et étude des performances des matériaux composites : cas d'une hydrolienne

Abstract : Recently, Renewable Marine Energies (RME) has emerged as a tremendous opportunity for a real ecological and industrial choice to meet the growing demands for energy and also to fight global warming. The study conducted in this thesis is with in this framework of research and is focused on the investigation of one of the most promising categories of RMEs which is tidal current turbine. A new hydrofoil for the turbine was designed using BEM (Blade Element Momentum) methods and CFD (Computational Fluid Dynamics) calculations with improved hydrodynamic efficiency. Furthermore, a series of numerical studies were conducted to investigate and examine the damage behavior of composite materials under critical loadings by developing DLOAD and VUMAT routines. This numerical study assisted in understanding the problems of structural lightening, resistance to fatigue and impact loading, and other degradation phenomena of themechanical properties of a composite turbine in severe marine environments and solving the needs of the manufactures. Moreover, study about the dynamic behavior of a composite/composite bonded assembly was also conducted because joint assembly plays a vital role in reducing the mass of the structure which is of extreme relevance in the field of marine and offshore structures. Another important obstacle regarding the application of composite and bonded structures in marine was the control of hygro-mechanical coupling. Therefore in this context, additional campaign of tests was carried out on bonded composite specimens by studying the hygrothermal effect on their dynamic behavior at different deformation rates using Hopkinson bar method. This hybrid study of hygro-thermal effect of the dynamic properties of the bonded composites will aid in optimization of the structures and to move into the commercial phase with a substantial gain in LCOE (Levelized Cost of Energy) in future.
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Submitted on : Tuesday, March 16, 2021 - 3:31:25 PM
Last modification on : Wednesday, March 16, 2022 - 3:44:05 AM
Long-term archiving on: : Thursday, June 17, 2021 - 7:44:20 PM


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  • HAL Id : tel-03170935, version 1


Mourad Nachtane. Énergies marines renouvelables et étude des performances des matériaux composites : cas d'une hydrolienne. Matériaux et structures en mécanique [physics.class-ph]. ENSTA Bretagne - École nationale supérieure de techniques avancées Bretagne; Université Hassan II (Casablanca, Maroc), 2019. Français. ⟨NNT : 2019ENTA0010⟩. ⟨tel-03170935⟩



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