Literatura científica selecionada sobre o tema "Fabrication additive par extrusion de métal"
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Artigos de revistas sobre o assunto "Fabrication additive par extrusion de métal"
Subramaniyan, M. K., D. Veeman, M. Vellaisamy, M. A. Browne e B. P. Patil. "Manufacturing of multi material wall via fused filament fabrication: An insight characteristics". Materialwissenschaft und Werkstofftechnik 54, n.º 12 (dezembro de 2023): 1514–22. http://dx.doi.org/10.1002/mawe.202200293.
Texto completo da fonteTeses / dissertações sobre o assunto "Fabrication additive par extrusion de métal"
Raynaud, Jonathan. "Elaboration de pièces 3D multimatériaux par fabrication additive". Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0101.
Texto completo da fonteCurrently, HTCC and LTCC (High and Low Temperature Co-fired Ceramics) parts are produced by two processes: tape casting for the dielectric ceramic part and screen printing for the realization of metal tracks and vias. The main objective of this work is to propose a new process for obtaining monolithic multi-material parts using the coupling of two additive manufacturing technologies. In this respect, a hybrid additive manufacturing process capable of building a 3D ceramic / metal part could be of major interest in the manufacture of such electronic components. Stereolithography and robocasting seem to be complementary processes to achieve this goal. The advantage of using additive manufacturing instead of conventional methods is to be able to achieve forms that can not currently be obtained in microelectronics, which would allow a performance gain compared to current circuits. A strategy combining stereolithography and robocasting is proposed for the simple manufacture of HTCC and LTCC multi-material parts. The model parts are electronic circuits in the three dimensions of the space including a dielectric substrate as well as horizontal tracks and vias. To improve the performance of current circuits new geometries are being studied, such as armored or inclined vias. They will then be characterized in microwave to verify the application of selected materials in these frequency ranges
Ginoux, Geoffrey. "Impression 3D et nanocomposites : Étude du comportement de mélanges PLA/argile appliquée à la fabrication additive par extrusion de matériaux". Thesis, Reims, 2018. http://www.theses.fr/2018REIMS016/document.
Texto completo da fonteAdditive manufacturing process is a preparation for the forming of a workpiece by the addition of material, by stacking successive layers. Although more and more polymers can be implemented by this technology, the filled polymers are practically absent, so they are widely used in other types of shaping methods. The scientific and technological objectives of the project are (i) a better understanding of the relationship between the rheological behavior of polymer systems and their ability to shaping by additive manufacturing technologies FDM, (ii) the development of polymer-based formulations biosourced adapted to these technologies and providing multifunctionality. The first goal will require first of all to identify the conditions (temperature, velocity gradients, nature constraints ...) imposed by the processes considered then to implement and / or adapt the means of characterization of the rheological behavior of polymer systems under these conditions. The rheological behavior in shear but also in elongation may be considered. It should in particular identify the necessary compromise between behavior adapted to the flow at the die or nozzle and meltability and consolidation layer by layer. Finally, the effect of different ways of functionalization considered on the rheological and thermal behavior and thus on the ability to formatting will be analyzed. In order to adapt the bio-sourced polymers for a wide range of applications, various routes of functionalization will be considered based on compounding with particulate fillers
Villaret, Flore. "Développement d’une jonction austéno-martensitique à gradient de composition chimique par fabrication additive". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI104.
Texto completo da fonteThis PhD work concerns the problem of bimetallic austenitic/martensitic steel connections. This research action focuses on a 316L austenitic steel (X2 CrNiMo 18-12-02) / Fe-9Cr-1Mo (X10 CrMo 9-1) martensitic steel connection. The objective is to understand the metallurgical problems related to the assembly of these two steels and to evaluate the possibilities of using powder metallurgy and additive manufacturing to produce austenitic/martensitic steel transitions. A weld obtained by electron beam is used as a reference for this study which focuses on the interest of powder metallurgy to achieve a transition between two steels. Materials with a chemical composition gradient have been consolidated by HIP and SPS and show very good mechanical properties and an excellent junction between the two steels. By additive manufacturing (DED-LB or PBF-LB), we also obtain very good bonds between the two steels, but the microstructures are much more complex. Curiously, we observe that the higher the cooling rate, the higher the ferrite fraction in the martensitic steel. Different calculations based on the nucleation and growth of the austenitic phase have made it possible to propose a coherent scenario to explain the phase fractions present in the materials. The transition zone between the two steels shows strong variations in hardness. These variations are explained by changes in chemical composition, leading to modifications in phase change temperatures, and the particular thermal cycles seen during building. From a technological point of view, materials obtained by additive manufacturing have tensile performances very similar to those obtained by electron beam welding. It is shown that additive manufacturing also makes it possible to control the composition gradient between a martensitic and an austenitic steel
Ducoulombier, Nicolas. "Anisotropic concrete : 3D priting of concrete reinforced by long fibers, process, characterisation et modelisation". Thesis, Paris Est, 2020. http://www.theses.fr/2020PESC2070.
Texto completo da fonteThis work focuses on the reinforcement strategies for large scale additive manufacturing of cementitious materials. This new process allows an important geometrical complexity for constructive elements, generally consuming a lot of material and human resources. In addition, it makes it theoretically possible to industrialize the manufacture of singular constructive elements, for example optimized to meet a given mechanical load. However, there is currently no standardized reinforcement method for obtaining the tensile strength and ductility required for their use in building structures. This severely limits their use in practice.While many reinforcement methods are considered in the literature for the 3D-printed cementitious materials, they are a direct transcription of the traditional reinforcement methods such as fibre-reinforced concrete, passive reinforcement and post-tension method. This thesis work proposes an alternative reinforcement process, patented during this thesis work, which takes advantage of the specificity of the extrusion process. Many continuous reinforcements can be inserted before the extrusion die and driven by the flow of the cementitious material, the latter providing the force necessary for the unwinding of each individual continuous reinforcements. The extruded material is then a unidirectional cementitious matrix composite reinforced by many continuous fibers aligned in the direction of the printing path.This work then defines the specifications of the process in terms of rheological properties of the cementitious matrix at the time of deposition and the type of reinforcement to be preferred, allowing good cohesion between the reinforcements and the cementitious matrix necessary for the development of a significant tensile reinforcement. The mechanical behaviour of the interface is also precisely studied thanks to the development of dedicated micromechanical tests and the observation of the damage by X-ray microtomography. The perspectives of this work are the characterization and multi-scale modeling of the behavior of the cementitious matrix composite and the proposal of innovative constructive systems
Archez, Julien. "Formulations de composites à base de liants basse température type géopolymère à base d'argilite et de différents renforts : réalisation d'une pièce par fabrication additive". Thesis, Limoges, 2020. http://aurore.unilim.fr/theses/nxfile/default/bd491a52-1855-4e0d-9b5b-6284748bb761/blobholder:0/2020LIMO0059_arch.pdf.
Texto completo da fonteThis work is part of the Cigéo project (geological industrial disposal for radioactive wastes) and focuses on studying alternative materials for the elaboration of the lining of the high-level radioactive waste storage cells. Composites materials with inorganic matrix and reinforcements are one of the innovations being considered as an alternative to replace metallic materials in the lining. The use of geopolymers reinforced with inorganic elements could meet the desired specifications. The insertion of wollastonite and glass fibers to a geopolymer matrix allowed to control viscosity suitable for shaping by casting and additive manufacturing while ensuring the mechanical strength of the consolidated material. This allows obtaining flexural and compressive strengths going up to 101 MPa and 20 MPa, respectively. To shape the extruded solution at a half scale, a 3D printing system was then developed. A specific extrusion head has been designed and integrated into a 6-axis robotic cell. The control and identification of printing and materials parameters make it possible to control the process and to print geopolymer composite structures at half scale (ɸ = 35 cm)