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Conception pour la fabrication additive, par fusion laser sur lit de poudre, de composants hyperfrequences

Abstract : For many years, passive microwave waveguide components have been used in communication systems, particularly for antenna feed chains. This kind of radiofrequency equipment is already widely operational in various fields such as satellite communications, radars, space observations, etc. Because of their low loss as well as their high energy management capacity. However, the emergence of new technologies and the significant degree of competition that occurs within the defense market, customers are increasingly calling for lower-cost products, shorter lead times, with requirements equally high.Over the past years, several institutions and industries have become more and more interested in additive manufacturing processes for passive waveguide components. Without any need for raw material or dedicated tools, additive technologies bring some new design perspectives. In particular, the addition of material layer by layer promotes the manufacture of monolithic parts, which would contribute to lighten the weight of antennas and save time and costs. On the other hand, it offers additional degrees of freedom during the design stage, encouraging the development of complex and innovative architectures, resulting in increased performance, which would be unachievable by conventional techniques. As such, additive manufacturing has been identified as being able to play a crucial role in the development of this type of part.However, like any other manufacturing process, additive processes involve several physical phenomena and so have their own manufacturing specificities and constraints to consider during the design phase to benefit fully from all the potential of additive manufacturing. Combined with the microwave requirements, the designer must then be able to identify the correlation between design, process and electromagnetic to guarantee a quality part conforming to the specifications.The objective of this study is twofold. The first one consists of identifying the specificities of the laser beam melting process with a major influence on electromagnetic properties, in order to be able to pay special attention during the design phase. The second concerns the development of a method that incorporates the constraints and opportunities of additive manufacturing while meeting the objectives arising from the microwave specifications.
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Submitted on : Saturday, December 5, 2020 - 4:47:27 AM
Last modification on : Monday, December 7, 2020 - 3:09:40 AM

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  • HAL Id : tel-03041563, version 1

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Mathieu François. Conception pour la fabrication additive, par fusion laser sur lit de poudre, de composants hyperfrequences. Mécanique des matériaux [physics.class-ph]. HESAM Université, 2020. Français. ⟨NNT : 2020HESAE008⟩. ⟨tel-03041563⟩

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