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Contribution à l'analyse expérimentale et numérique pour l'élaboration d'absorbeurs d'énergie obtenus par procédés de fabrication additive

Abstract : The profitability of civil transport helicopters is a key parameter that forces aircraft manufacturers to always push forward innovation and design optimization. Next generation of aircraft must be able to fly longer and have increased transport capacities. Weight reduction on in-flight equipment is a critical factor to achieve better performances in the future. The research work carried out during the PhD thesis was initiated by the aeronautical equipment manufacturer Zodiac Seats France, the French leader in the market of technical seats for civil helicopters. The desired objective of the company is the mid-term development of a passenger seat with a targeted mass reduction of 50% to current equipments. This improvement is only possible today with technological breakthrough. New processes, particularly in the field of additive manufacturing, allow nowadays the production of innovative structures with complex shapes. The choice of additive manufacturing technology EBM "Electron Beam Melting" is fixed. The research conducted here aims to ensure the safety of future seats in the event of a crash, thanks to the study of new technical solutions to allow optimal absorption of energy at impact. The works presented are organized in three parts. The first concerns the static and dynamic tensile characterization as well as the numerical modeling of titanium Ti-6Al-4V obtained by additive manufacturing EBM. For this purpose, an experimental protocol and an experimental plan have been defined. The second part aims to validate the material properties established by means of tests and simulations at the scale of complex structures in order to provide the designer with a numerical modeling tool allowing efficient dimensioning. Finally, the third part presents the strategy developed during the thesis to help in optimizing, through the numerical simulation, the future structures capable of absorbing a maximum of energy for a given geometrical space.
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https://hal-uphf.archives-ouvertes.fr/tel-03366188
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Submitted on : Tuesday, October 5, 2021 - 3:27:26 PM
Last modification on : Wednesday, October 6, 2021 - 3:36:15 AM

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  • HAL Id : tel-03366188, version 1

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Alexandre Hiricoiu. Contribution à l'analyse expérimentale et numérique pour l'élaboration d'absorbeurs d'énergie obtenus par procédés de fabrication additive. Mécanique [physics.med-ph]. Université de Valenciennes et du Hainaut-Cambrésis, 2018. Français. ⟨NNT : 2018VALE0011⟩. ⟨tel-03366188⟩

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