Дисертації з теми "Additive manufacturing (FDM)"
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Rafaja, Hynek. "Monitorování procesu FDM tisku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399310.
Ravi, Prame Manush. "Fracture Properties of Thermoplastic Composites Manufactured Using Additive Manufacturing." Youngstown State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1516191324564382.
Emericks, Isak. "Challanges In Constructing Large Frame FDM 3D Printers." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-279503.
Det här projektet initierades av Postnord som ville utveckla en egen storskalig FDM 3D printer, huvudsakligen på grund av två anledningar. Den första för att kunna använda samarbetet med KTH för att visa hur Postnord främjar inhemsk produktion samtidigt som de själva är ledare och initiativtagare inom additiv tillverkning i Sverige. Den andra anledningen var för att få tag på en maskin som har möjligheten att skriva ut stora- och småskaliga prototyper och produkter som kan användas i en industriell miljö. De uppsatta målen och önskvärda resultatet med PP3D (PostPapper3D - projektnamn) var att konstruera en storskalig FDM 3D skrivare, men en byggarea på 1 kvadratmeter och (om möjligt) en byggvolym på 1 kubikmeter, kapabel att skriva ut delar för industriella tillämpningar. Det här skulle uppnås genom att använda industriella komponenter och toppmoderna kontrollsystem för 3D skrivare. Sensorer för att upptäcka när utskriftsmaterialet var på väg att ta slut och automatisk utjämning av byggytan var också önskvärt. Förutom dessa målsättningar så ville KTH-IIP att arbetet skulle fokusera på konstruktionen av en storskalig FDM 3D skrivare, vilka utmaningar och problem som uppstår när tekniken skalas upp, för att fortsätta den interna visionen om att utveckla strategiska kompetenser inom additiva tillverkningsmetoder - vilket industrin efterfrågade. Resultatet av projektet var en 3D skrivare med en byggvolym på 1000x1000x950 [mm] som kommer utrustad med två (individuellt styrda) utskriftshuvuden - som antingen kan skriva ut två identiska kopior av samma objekt eller som kan arbeta tillsammans för att bygga upp en komponent mer effektivt. Den högsta testade utskriftshastigheten var 100 [mm/s] och den högsta testade hastigheten för rörelse var 250 [mm/s]. Den teoretiska upplösningen hos maskinen är 50 [μm] men det här har inte kontrollerats i det här projektet. Inom omfattningen av ett examensarbete (civilingenjör) så hann inte alla prototyp-symptom elimineras, där det mest betydande problemet var att motorerna bitvis missar steg (och förlorar sin positionering) under hastiga accelerationer och förändringar i rörelseriktning. När detta händer så resulterar det oftast i misslyckade utskrifter. Den presenterade lösningen för det här är att fortsätta justera mjukvaruinställningarna tills finare och mer kontrollerade rörelsemönster uppnås. En annan tänkbar lösning är att byta ut motorerna mot starkare varianter. Vid leverans så nyttjar maskinen toppmoderna komponenter och mjukvara, från framstående svenska och internationella producenter. En intervju med Isak Emericks tillsammans med 3D skrivaren hittas i Bilaga B, i formen av ett nyhetsbrev.
Kota, Vasuman. "Rasters vs Contours For Thin Wall ULTEM 9085 FDM Applications." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1567029612963881.
Sauter, Barrett. "Ultra-light weight design through additive manufacturing." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-45160.
Ferri, Martina. "Studio di nanocompositi di TPU/grafene per additive manufacturing." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24385/.
Ahmadifar, Mohammad. "Etude de la rhéologie des composites polymères au cours du procédé FDM (Fabrication additive)." Thesis, Paris, HESAM, 2021. http://www.theses.fr/2021HESAE072.
Additive manufacturing (AM) is a novel technology that enables rapid fabrication of physical models directly from 3D computer-aided design (CAD) data without any conventional tooling or programming requirement. Thermoplastic polymers are the most useful materials for the manufacturing of parts in the FFF process. In this process, extrusion of a semi-molten road through a nozzle is taken place to form each layer, the extruded road solidifies quickly due to the existence of temperature gradient between the surroundings and the extrusion temperature. Different key parameters affect the final products manufactured by this process. These parameters can be listed in three categories. Some of them are linked to the material, others are linked either to the characteristics of the process or to the specificity of the machine. They can influence the properties of the final part through their effect on various physical phenomena. The mentioned parameters affect the polymer temperature and its evolution. It is important to know the evolution of filaments temperature with time and recognize how it is affected by major process variables as mentioned. Due to the nature of the FFF process, it is important to measure the temperature profile and its evolution during the process by the means of local measurement methods. The idea of this work took place in 2018, by start reviewing literatures related to the FFF process. As mentioned, almost all studies and works either numerical or experimental approaches were based on global consideration. In the beginning, the work was concentrated on finding a method to be applied to the FFF process to proceed with the localized investigation. Afterward, the experiment was started to see the possibility of the work. As in the FFF process, there is a deposition of filaments, and each filament itself is heated by the deposition of newer filaments, there is almost a cyclic evolution of the temperature due to multi-layer d eposition and it means that each filament is re-heated consequently because of the deposition of a new filament. This is a critical issue in creating a filament bonding and diffusion of materials. To implement and measure this cyclic temperature, it is required to apply a measurement device in which to be capable of measuring the temperature of the polymer when leaving the nozzle. One can note that the mechanical properties of 3d-printed pieces are limited. In this work, we try to improve the mechanical properties by reinforcing the fibers such as glass fibers, carbon fibers, etc. At the same time by controlling the temperature evolution, we try to improve the adhesion between the layers to have the best structure. The used material as raw material was polyamide-6 (PA6). The main objective of this research is to study the rheological characteristics of materials during FDM/FFF to process optimization for mechanical characterization improvement of the fabricated parts. Therefore, the main objective is to take into account both the temperature and viscosity parameters, and to establish the Time-Temperature-Transformation diagram for process optimization. This helps to determine the processability area
Capriotti, Marco. "Utilizzo di scarti agroalimentari nella produzione di biocompositi per additive manufacturing." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amslaurea.unibo.it/25767/.
Bernardi, Alberto. "Controllo di un dispositivo di alimentazione filo per una stampante FDM." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Guglieri, Alessandro. "Design ed ottimizzazione strutturale di un APR realizzato con tecnologie additive." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23557/.
Murrey, Jordan Alexander. "A Methodology to Evaluate the Performance of Infill Design Variations for Additive Manufacturing." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1577967439125664.
PAKKANEN, JUKKA ANTERO. "Designing for Additive Manufacturing - Product and Process Driven Design for Metals and Polymers." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2714732.
Hayagrivan, Vishal. "Additive manufacturing : Optimization of process parameters for fused filament fabrication." Thesis, KTH, Lättkonstruktioner, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-238184.
Ett hinder för att additiv tillverkning (AT), eller ”3D-printing”, ska få ett bredare genomslag är svårigheten att uppskatta effekterna av processparametrar på den tillverkade produktens mekaniska prestanda. Det komplexa förhållandet mellan geometri och processparametrar gör det opraktiskt och komplicerat att härleda analytiska uttryck för att förutsäga de mekaniska egenskaperna. Alternativet är att istället använda numeriska modeller. Huvudsyftet med denna avhandling har därför varit att utveckla en numerisk modell som kan användas för att förutsäga de mekaniska egenskaperna för detaljer tillverkade genom AT. AT-tekniken som avses är inriktad på Fused Filament Fabrication (FFF). En numerisk modell har utvecklats genom att återskapa FFF-byggprocessen i en simuleringsmiljö. Instruktioner (skriven i GCode) som används för att bygga en detalj genom FFF har här översatts till en numerisk FE-modell. Modellen används sen för att bestämma effekterna av processparametrar på styvheten och styrkan hos den tillverkade detaljen. I detta arbete har strukturstyvheten hos olika detaljer beräknats genom att utvärdera modellens svar för jämnt fördelade belastningsfall. Styrkan, vilket är starkt beroende på den tillverkade detaljens termiska historia, har inte utvärderats. Den utvecklade numeriska modellen kan dock fungera som underlag för implementering av modeller som beskriver relationen mellan termisk historia och styrka. Den utvecklade modellen är anpassad för optimering av FFF-parametrar då den omfattar effekterna av alla FFF-parametrar. En genetisk algoritm har använts i detta arbete för att optimera parametrarna med avseende på vikt för en given strukturstyvhet.
Iori, Alessandro. "Sviluppo di ambiente CAD per l'analisi di componenti aerospaziali progettati per Additive Manufacturing." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Coe, Edward Olin. "Printing on Objects: Curved Layer Fused Filament Fabrication on Scanned Surfaces with a Parallel Deposition Machine." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/101096.
Master of Science
Fiorenza, Cristina. "Preparazione e caratterizzazione di nuovi nanocompositi elastomerici mediante stampa 3D." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20974/.
Voigt, Sven P. "Quantifying the Hierarchical Mesostructure of Fused Deposition Modeled Materials and Measuring the Effect on the Elastic Mechanical Response." Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1511919156291091.
Stockham, Corbin H. "Rapid Tooling Carbon Nanotube-Filled Epoxy for Injection Molding Using Additive Manufacturing and Casting Methods." Ohio University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1591803958920497.
Vergara, Gianluca. "Produzione di un filamento a base di acido polilattico additivato con rinforzo di origine naturale per additive manufacturing." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21683/.
Palmer, Andrew. "The Design and Development of an Additive Fabrication Process and Material Selection Tool." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3635.
M.S.
Department of Industrial Engineering and Management Systems
Engineering and Computer Science
Industrial Engineering MS
Caselli, Lorenzo. "Progettazione di un sistema di caricamento automatico del filamento di una stampante 3D." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
KHAN, FAHAD AHMAD. "Developing Robot assisted Plastic 3D Printing Platform." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-295472.
Prusic, André. "Perimeter." Thesis, KTH, Arkitektur, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-146717.
Projektet undersöker möjligheterna att använda additiv tillverkning (3d-printning) för att bygga arkitekturen. Genom en kombination av teoretisk forskning och praktiska experiment har ett byggsystem utvecklats som har kapacitet att skapa hus med stora geometriska flexibilitet till ett överkomligt pris i dag. Konstruktionssystemet Perimeter demonstreras i en paviljong belägen på Norra Djurgården i Stockholm.
Gullapalli, Ram A. "A Study of Mixed Manufacturing Methods in Sand Casting Using 3D Sand Printing and FDM Pattern-making Based on Cost and Time." Youngstown State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1485335857475363.
Franzén, Johan. "FrankZlicer : Direct slicing using arcs." Thesis, Mittuniversitetet, Avdelningen för data- och systemvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-36021.
De, Martino Luciano. "Caratterizzazione di un materiale composito innovativo trasformato mediante tecnologia additiva." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Chaloupka, Matyáš. "Konstrukce 3D tiskárny pro tisk materiálu s příměsí karbonových vláken." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318141.
Pooladvand, Koohyar. "Multifunctional Testing Artifacts for Evaluation of 3D Printed Components by Fused Deposition Modeling." Digital WPI, 2019. https://digitalcommons.wpi.edu/etd-dissertations/568.
Branco, Rodolfo Ramos Castelo. "Elaboração de protocolo de ensaios mecânicos para avaliação da performance do material PLA através da manufatura aditiva por meio do processo FDM." Universidade Estadual da Paraíba, 2016. http://tede.bc.uepb.edu.br/jspui/handle/tede/3071.
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Technological innovation has been a constant in several areas in the contemporary world, emphasizing in the areas of engineering and health. In this scenario, there is the Additive Manufacturing (MA), which consists of a manufacturing process using the addition of material in successive flat layers, in which it is possible to generate 3D physical parts obtained directly from CAD (Computer Aided Design). The MA is divided into several processes, in this study it will be highlighted by Fusion and Deposition Modeling (FDM) of the solids class, which uses solid polymer coils, especially Poly lactic acid (PLA). This technology of manufacturing process has been gaining more and more prominence in the technological scenario, with which it is possible to affirm that the Additive Manufacturing is on a scale of growth, being considered by many scholars as the new industrial revolution, which obviously opens space for New research in the area, thus necessitating the consolidation of processes, machinery and materials. In this context of recognition of the participation that the Additive Manufacturing process has been achieving, this study aimed to elaborate mechanical testing protocols for the evaluation of PLA material performance through the MA from the FDM process. The applied methodology was based on studying the parameters of construction of the pieces in FDM (structure, raster, deposition rate, temperature, loops, orientation of the raster angle, position orientation of the pieces, among others), to perform the mechanical tests of the Type and analyze the results obtained through strain-strain graphs (maximum tensions, rupture and modulus of elasticity). The result obtained evidenced little difference between the deposition rates (20%, 50% and 100%) regarding the construction time. Regarding the mechanical properties, the pieces with 100% fill characteristics in their internal structure presented better tensions. It was also observed the influence of the position of construction of the specimens in the printing tray, changing its mechanical characteristics.
A inovação tecnológica tem sido uma constante em diversas áreas no mundo contemporâneo, destacando-se nas áreas de engenharia e saúde. Neste cenário, encontra-se a Manufatura Aditiva (MA), que consiste em um processo de fabricação utilizando a adição de material em camadas planas sucessivas, no qual é possível gerar peças físicas em 3D, obtidas diretamente de arquivos de modelagem CAD (Computer Aided Design). A MA divide-se em vários processos, neste estudo será destacado por Modelagem de fusão e deposição (FDM) da classe dos sólidos, o qual utiliza bobinas de polímeros sólidos, especialmente o Poli ácido láctico (PLA). Esta tecnologia de processo de fabricação vem ganhando cada vez mais destaque no cenário tecnológico, com isso é possível afirmar que a Manufatura aditiva se encontra em uma escala de crescimento, sendo considerada por muitos estudiosos como a nova revolução industrial, o que obviamente abre espaço para novas pesquisas na área, havendo assim a necessidade da consolidação dos processos, máquinas e materiais. Neste contexto de reconhecimento da participação que o processo de Manufatura Aditiva vem alcançando, este estudo visou elaborar protocolos de ensaios mecânicos para avaliação de performance do material PLA através da MA a partir do processo FDM. A metodologia aplicada baseou-se em estudar os parâmetros de construção das peças em FDM (estrutura, raster, taxa de deposição, temperatura, loops, orientação do ângulo raster, orientação da posição das peças, dentre outros), em realizar os ensaios mecânicos do tipo tração e analisar os resultados obtidos através dos gráficos de tensão-deformação (tensões máxima, ruptura e modulo de elasticidade). O resultado obtido evidenciou pouca diferença entre as taxas de deposição (20%, 50% e 100%) no tocante ao tempo de construção. Em relação as propriedades mecânicas, as peças de características 100% de preenchimento em sua estrutura interna apresentaram melhores tensões. Observou-se também, a influência da posição de construção dos corpos de prova na bandeja de impressão, alterando suas características mecânicas.
Stellmar, Justin. "Predicting the Deformation of 3D Printed ABS Plastic Using Machine Learning Regressions." Youngstown State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1587462911261523.
ANDERSSON, AXEL. "Automation of Fused Filament Fabrication : Realizing Small Batch Rapid Production." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-299447.
I det här kandidatarbetet undersöker jag hur automatisering inom fused filament fabrication (FFF) kan implementeras, och vad begränsningarna är för olika sorters automatiseringslösningar för FFF. Det läggs även fram en uträkning för den kommersiella gångbarheten för small batch rapid production med implementeringen av ett automatiskt FFF-system. Tillvägagångsättet bestod av en kvalitativ studie baserad på fem intervjuer, kombinerad med empirisk kunskap och data från additiva tillverkningsföretaget Svensson 3D. Det här kompletterades med en analys av vilka parametrar som bör användas för att utvärdera lösningar för FFF-automatisering, och ett ramverk där automatiseringslösningarna betraktas ur ett operatörs-perspektiv. För att räkna ut den kommersiella gångbarheten för automatiseringslösningar av FFF användes internränta och återbetalningstid. Det här resulterade i sex parametrar för att utvärdera automatiseringslösningar för FFF, tre utvärderingar av vilka problem som finns i tre existerande automatiseringslösningar, och slutsatsen att small batch rapid production är kommersiellt gångbart för automatiserad FFF. Slutligen innehåller arbetet en diskussion gällande framtiden för FFF och begränsningarna hos det ramverk som presenterades för att utvärdera automatiserade FFF system. Möjliga lovande lösningar för automatiserad FFF presenteras och hur design för additiv tillverkning kan hjälpa till att forma framtiden för automatiserad FFF.
Engkvist, Gustav. "Investigation of microstructure and mechanical properties of 3D printed Nylon." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-66304.
M'Bengue, Marie-Stella. "Conception et évaluation d'une endoprothèse vasculaire par impression 3D pour le traitement des anévrismes complexes de l'aorte abdominale." Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILS057.
Endovascular repair (EVAR) of an abdominal aortic aneurysm (AAA) involves the placement into the aneurysm of a stent graft (SG) by minimally invasive surgery. This procedure prevents rupture of the damaged tissue involved in an AAA, defined as a localized diameter dilation of the aorta. When the upstream portion of the aneurysm includes the peripheral renal and/or visceral arteries, the AAA is qualified as complex. In this case, the deployed SG is said “fenestrated”, in other words, perforated at the site of junctions to the peripheral arteries. Management of a complex AAA becomes more limiting as the fenestrated SG will be custom designed to match the anatomy of the aneurysm and the position of the peripheral arteries of the patient. This implies a manufacturing delay of several weeks, limits the management to stable aneurysms and excludes emergency situations. In this context, 3D printing (3DP) is of considerable interest for the fabrication of custom-made SGs in a very short time frame. Thus, the objective of this thesis work is to design a SG prototype by 3D printing of a medical grade thermoplastic polyurethane (TPU) (thermoplastic elastomer). The present work will validate the manufacturing process and the functionality of our 3DP-SG for its final application as an implantable medical device.First, the impact of the manufacturing process on the chemical, physical and physicochemical properties of TPU was studied at each step, from the pellets to the gamma-ray sterilization of a graft manufactured by fused filament deposition (FDM). In vitro preliminary evaluation of the cytotoxicity and hemocompatibility of TPU was carried out after the 3D printing and sterilization step. Aging of TPU under extreme oxidizing conditions was performed to predict the evolution of its properties in the long term. Subsequently, a design strategy for an endovascular implantable prototype was developed. The properties of said prototype were characterized by different techniques (SEC, TGA, DSC, FTIR, SEM, goniometry, uniaxial traction, ...). Its biological properties were evaluated in vitro by tests of cytocompatibility, hemocompatibility and contact with macrophages for 24 hours (acute inflammation). Moreover, the evolution of its physicochemical and mechanical properties was evaluated by in vitro aging studies.The characterization of the chemical, physical and physicochemical properties of TPU enabled the validation of a FDM printing manufacturing route and gamma ray sterilization of a crimpable SG prototype. The in vitro biological evaluation showed the non-cytotoxicity of the SG prototype by the extraction method. Moreover, the prototype was found to be weakly hemolytic and the platelets adhered on its surface were not activated. The low secretion of cytokines (IL-6 and TNF-α) upon contact with inactivated macrophages showed that the SG prototype does not exhibit a pro-inflammatory characteristic. Finally, aging studies showed an impact on the mechanical and surface properties of our SG prototype without compromising its functionality. Subsequently, the design strategy could evolve towards a functionalization of the SG prototype in order to prevent infections and thrombosis responsible for 2% and 6% of postoperative complications respectively
Lami, Isacco. "Ottimizzazione di strutture reticolari in additive manufacturing." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Abdelki, Andreas. "Fused deposition modeling of API-loaded mesoporous magnesium carbonate." Thesis, Uppsala universitet, Nanoteknologi och funktionella material, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-417897.
Chen, Shuai. "Investigation of FEM numerical simulation for the process of metal additive manufacturing in macro scale." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI048/document.
Additive manufacturing (AM) has become a new option for the fabrication of metallic parts in industry. However, there are still some limitations for this application, especially the unfavourable final shape and undesired macroscopic properties of metallic parts built in AM systems. The distortion or crack due to the residual stress of these parts leads usually to severe problems for some kinds of metal AM technology. In an AM system, the final quality of a metallic part depends on many process parameters, which are normally optimized by a series of experiments on AM machines. In order to reduce the considerable time consumption and financial expense of AM experiments, the numerical simulation dedicated to AM process is a prospective alternative for metallic part fabricated by additive manufacturing. Because of the multi-scale character in AM process and the complex geometrical structures of parts, most of the academic researches in AM simulation concentrated on the microscopic melting pool. Consequently, the macroscopic simulation for the AM process of a metallic part becomes a current focus in this domain. In this thesis, we first study the pre-processing of AM simulation on Finite Element Method (FEM). The process of additive manufacturing is a multi-physics problem of coupled fields (thermal, mechanical, and metallurgical fields). The macroscopic simulation is conducted in two different levels with some special pre-processing work. For the layer level, the reconstruction of 3D model is conducted from the scan path file of AM machine, based on the inverse manipulation of offsetting-clipping algorithm. For the part level, the 3D model from CAD is reconstructed into a voxel-based mesh, which is convenient for a part with complex geometry. The residual stress of a part is analysed under different preheat temperatures and different process parameters. These simulations imply the potential technique of reducing residual stress by the optimisation of process parameters, instead of the traditional way by increasing preheat temperature. Based on the FEM simulation platform above, two simulations at line level are also studied in this thesis, aiming at the relation between the AM process and part's final quality. These examples demonstrate the feasibility of using macroscopic simulations to improve the quality control during the AM process. In the first task, dataset of heating parameters and residual stress are generated by AM simulation. The correlation between them is studied by using some regression algorithm, such as artificial neural network. In the second task, a PID controller for power-temperature feedback loop is integrated into AM process simulation and the PID auto-tuning is numerically investigated instead of using AM machine. Both of the two tasks show the important role of AM macroscopic process simulation, which may replace or combine with the numerous trial and error of experiments in metal additive manufacturing
Pastuglia, Matteo. "Applicazione delle tecniche additive ad una lama per pattinaggio di figura." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Severino, Giosuè. "Design, manufacturing and test of a SynRM motor prototype." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.
Gatti, Ilaria. "Confronto fra un componente realizzato in additive manufacturing e il suo equivalente realizzato con tecniche tradizionali." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17129/.
Settanni, Antonio. "Comparazione strutturale di componenti realizzati a terra e nello spazio mediante tecniche additive." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
Di, Santi Filippo. "Ottimizzazione topologica di paratie di pressurizzazione di velivoli commerciali." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Bianchi, Alfredo. "Implementazione di moduli per la modellazione CAD di strutture aerospaziali basate su elementi lattice." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Pietrangelo, Alessio. "Realizzazione e caratterizzazione di una placca cranica mediante produzione additiva e materiale polimerico." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.
Vellone, Davide. "Ottimizzazione strutturale di una bulkhead di fusoliera di velivoli da trasporto commerciale." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Iacob, Alexandru Sorin. "Studio comparativo tra configurazioni alari convenzionali e con struttura lattice." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Grunden, Eric Hans. "Examination of Rapid Prototype Tooling." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1460495153.
Conti, Alfredo. "Tecniche della manifattura additiva - applicazioni in ambito aeronautico e aerospaziale." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13306/.
Myers, Eric J. "Finite Element Modeling (FEM) of Porous Additively Manufactured Ferromagnetic Shape Memory Alloy Using Scanning Electron Micrograph (SEM) Based Geometries." Youngstown State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ysu149399154152881.
Lazzarini, Lorenzo. "Ottimizzazione mediante codici di calcolo open source di componenti per il settore aerospaziale." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
Panaro, Giuseppe. "Studio numerico e sperimentale su una placca cranica impiantabile realizzata mediante manifattura additiva." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.