Dissertations / Theses on the topic 'Bioinks or Additive manufacturing'
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Minck, Justin Stewart. "DEVELOPING A LOW COST BIOLOGICAL ADDITIVE MANUFACTURING SYSTEM FOR FABRICATING GEL EMBEDDED CELLULAR CONSTRUCTS." CSUSB ScholarWorks, 2019. https://scholarworks.lib.csusb.edu/etd/844.
Full textHintz, Madeline L. "Optimising breast implant geometry using 3-dimensional imaging." Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/115013/1/115013_7535198_madeline_hintz_thesis.pdf.
Full textKeil, Heinz Simon. "Quo vadis "Additive Manufacturing"." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-214719.
Full textLeirvåg, Roar Nelissen. "Additive Manufacturing for Large Products." Thesis, Norges Teknisk-Naturvitenskaplige Universitet, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20870.
Full textJun, Sung Yun. "Additive manufacturing for antenna applications." Thesis, University of Kent, 2018. https://kar.kent.ac.uk/68833/.
Full textRanjan, Rajit. "Design for Manufacturing and Topology Optimization in Additive Manufacturing." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439307951.
Full textLebherz, Matthias, and Jonathan Hartmann. "Commercializing Additive Manufacturing Technologies : A Business Model Innovation approach to shift from Traditional to Additive Manufacturing." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-36132.
Full textKhan, Imran. "Electrically conductive nanocomposites for additive manufacturing." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/670587.
Full textLa fabricación aditiva (AM) es un proceso de fabricación de capas sucesivas de material para construir un objeto sólido tridimensional a partir de un modelo digital, a diferencia de las metodologías de fabricación sustractiva. AM ofrece la libertad de diseñar e innovar un producto para que se puedan obtener y revisar piezas complejas si es necesario, en un tiempo reducido en comparación con las tecnologías de fabricación tradicionales. En términos de su utilización total y generalizada, la tecnología tiene aplicaciones limitadas. Por motivos similares, la nanotecnología se considera la fuerza impulsora detrás de una nueva revolución industrial. Tiene la capacidad de incorporar funcionalidades específicas, que se producen debido a la escala nanométrica, a las partes deseadas para dispositivos funcionales como electrodos para dispositivos de almacenamiento de energía. La tesis se centra en el uso de nanocompuestos conductores de electricidad en la fabricación aditiva. En este escenario, dos tipos de nanocompuestos están preparados para usar como materia prima para la impresión de nanocompuestos conductores de electricidad que emplean dos tipos diferentes de material matricial; (1) un polímero termoplástico y (2) una resina termoestable. Los nanotubos de carbono se usaron como partículas de nanoestructura eléctricamente conductoras. Estas nanoestructuras forman redes complejas en una matriz polimérica de manera que el material de la matriz se transforma de un material aislante en un material eléctricamente conductor. La policaprolactona es un polímero semicristalino y se considera un material matriz adecuado entre la clase de polímeros termoplásticos, ya que ofrece excelentes características reológicas, de flujo y elásticas. Los hilos se imprimieron usando una extrusora biológica y se midió la conductividad eléctrica en estos hilos bajo el efecto de la deformación uniaxial. La microestructura cambia bajo el efecto de una deformación uniaxial que conduce a alterar la orientación de los nanotubos de carbono en la matriz de policaprolactona. Como consecuencia de la realineación de los nanotubos, las vías conductoras interrumpen u organizan, lo que puede aumentar o disminuir la conductividad eléctrica en los nanocompuestos. Las radiaciones de sincrotrón se utilizan para sondear tales cambios en la microestructura. Se prepararon diferentes composiciones usando nanotubos de carbono y las muestras impresas se estudiaron en términos de conductividad eléctrica y microestructura usando radiaciones sincrotrónicas. Basado en el análisis, se propone un modelo que puede predecir la conductividad eléctrica bajo el efecto de la deformación uniaxial. En términos de polímeros termoestables, se introduce un sistema simple para la impresión de nanocompuestos termoestables a base de polímeros. El detalle completo del sistema de impresión y la tinta de nanocompuestos se proporciona en uno de los capítulos. La tinta de nanocompuesto a base de epoxi se preparó para contener nanotubos de carbono como partículas de relleno con una pequeña porción de polímero termoplástico, policaprolactona. Las muestras impresas están sujetas al sesgo externo que indica que son eléctricamente conductoras. Se prepararon diferentes composiciones usando resina epoxi de glicidil bisfenol-A, trietilentetramina, policaprolactona, nanotubos de carbono y se resaltan los problemas para adquirir la calidad de impresión adecuada. Las muestras impresas se estudiaron en términos de conductividad eléctrica, estudiando la conductividad eléctrica de corriente alterna y continua. El sistema de materiales se explora en términos del nivel de reticulación, estructura y morfología y comportamiento térmico. Se presenta un modelo para los nanocompuestos utilizando datos de impedancia obtenidos mediante espectroscopía dieléctrica de banda ancha. La impresora se utilizará en el futuro para imprimir dispositivos funcionales a pequeña escala, incluidos dispositivos de almacenamiento de energía.
Additive manufacturing is a process of making successive layers of material to build a three-dimensional solid object from a digital model, as opposed to subtractive manufacturing methodologies. This technology offers the freedom to design and innovation of a product so that complex parts can be obtained and revise if needed, within a small time as compared to traditional manufacturing technologies. In terms of its full utilization and widespread, the technology has limited applications. On similar grounds, nanotechnology is considered as the driving force behind a new industrial revolution. It has the ability to incorporate specific functionalities, occur due to the nanometric scale, to desired parts that offer freedom to design functional devices like electrodes for energy storage devices. The thesis is focusing on the use of electrically conductive nanocomposites into additive manufacturing. In this scenario, two types of nanocomposites are prepared to use as raw material for printing of electrically conductive nanocomposites employing two different types of matrix material; (1) a thermoplastic polymer and (2) a thermoset resin. Carbon nanotubes were used as electrically conductive nanostructure particles. These nanostructures form complex networks into a polymer matrix such that the matrix material transforms from an insulative material into an electrically conductive material. Polycaprolactone is a semicrystalline polymer and it is considered suitable matrix material amongst the class of thermoplastic polymers as it offers excellent rheological, flow and the elastic characteristics. Strands were printed using a bio extruder and electrical conductivity was measured in these strands under the effect of uniaxial deformation. The microstructure changes under the effect of uniaxial deformation leading to alter the orientation of carbon nanotubes in the polycaprolactone matrix. As a consequence of realignment of nanotubes, conductive pathways either disrupt or organize which can increase or decrease an electrical conductivity in the nanocomposites. Synchrotron radiations are used to probe such changes in the microstructure. Two different compositions were prepared using carbon nanotubes and the printed samples are studied in terms of electrical conductivity and microstructure using synchrotron radiations. Based on the analysis, a model is proposed that can predict the orientation of carbon nanotubes under the effect of uniaxial deformation. In terms of thermoset polymers, a simple system is introduced for the printing of thermoset polymer (epoxy) based nanocomposites. Complete detail of the printing system is provided in one of the chapters. Epoxy-based nanocomposite ink was prepared to contain carbon nanotubes as filler particles with a small portion of thermoplastic polymer, polycaprolactone. The printed samples are subject to the external bias which indicate that these are electrically conductive. A complete methodology was provided for the preparation of nanocomposite ink. Different compositions were prepared using glycidyl bisphenol-A epoxy resin, triethylenetetramine, polycaprolactone, carbon nanotubes and issues are highlighted to acquire appropriate print quality. The printed samples were studied in terms of electrical conductivity studying alternating and direct current electrical conductivity. The material system is explored in terms of the level of crosslinking, structure and morphology and thermal behaviour. A model is presented for the nanocomposites using impedance data obtained through broadband dielectric spectroscopy. The printer will be used in future to print small scale functional devices including energy storage devices e.g. solid-state batteries, supercapacitors and electrode plates for such kind of devices.
Universitat Autònoma de Barcelona. Programa de Doctorat en Ciència de Materials
Nopparat, Nanond, and Babak Kianian. "Resource Consumption of Additive Manufacturing Technology." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3919.
Full textMcLearen, Luke J. "Additive manufacturing in the Marine Corps." Thesis, Monterey, California: Naval Postgraduate School, 2015. http://hdl.handle.net/10945/45903.
Full textAs the Marine Corps continues to conduct small-unit distributed operations, the strain on its logistics intensifies. The Marine Corps must search for a solution to increase the efficiency and responsiveness of its logistics. One solution is using additive manufacturing, commonly referred to as 3D printing. This thesis answers the question of how additive manufacturing can improve the effectiveness of Marine Corps logistics. In order to answer the question, beneficial process(es), application(s), and level of integration are determined through a comparative analysis of current and future 3D-printing processes, examination of several civilian and military examples, and examination of the impact across current doctrine, organization, training, material, leadership, personnel, and facilities. Several issues should be addressed prior to the Marine Corps fully integrating 3D printers, such as the lack of certification and qualification standards, unreliable end product results, and determining ownership of intellectual property. When these issues are properly mitigated, the Marine Corps should procure printers for the purpose of manufacturing repair parts, tools, and other support aids. Marine Expeditionary Units should be the first units to receive the printers. If the printers are integrated properly, they could assist logisticians in supporting Marines conducting distributed operations throughout the battlefield.
Raza, Irfan Mohammad Hussain. "Additive manufacturing of locally resonant metamaterials." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/54773.
Full textJones, Rhys Owen. "Additive manufacturing of functional engineering components." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.577739.
Full textWehrs, Jason. "Financing for growth in additive manufacturing." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/117985.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 39-40).
Digital fabrication technologies have been improving their capabilities and competitiveness steadily over the past decade and may be approaching an inflection point in their enterprise adoption. However, several important technological, economic (cost) and business (adoption risk) barriers stand in the way of broader adoption. This research seeks to explore the rich history that has driven the growth of Additive Manufacturing (3D Printing) in the application of manufacturing of a displacement or augmentation of current production level techniques, what business model or characteristics will continue to drive growth and industrial adoption, and the current limitation that must be overcome to unlock broader enterprise adoption. Furthermore, from the viewpoint of growth financing, this paper seeks to answer two critical questions to highlight investment opportunities in the space of Additive Manufacturing; 1) Where is digital fabrication positioned to compete with traditional manufacturing methods over the next five years and what are the key enablers, and 2) As digital fabrication becomes more competitive for different applications, who in the value chain benefits the most.
by Jason Wehrs.
M.B.A.
Garza, Jose M. (Jose Manuel Garza Estrada). "Understanding the adoption of additive manufacturing." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/110892.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 55-56).
Additive Manufacturing (AM) -commonly known as 3d printing - is experiencing an upward trend as measured by a number of metrics, such as patent filing and number of company entries. The number of companies manufacturing hardware, software and materials serving both consumer and industrial segments of this industry has increased over recent years. This technology has radically changed how companies, designers and consumers in general go about prototyping their ideas. AM has also impacted low-volume manufacturing by allowing the production of small batches of products with all the advantages and flexibility the technology confers. Because the industry is still in its fluid phase, a high level of activity and significant changes are still to come. Employing Diffusion of Innovation theory by E.M. Rogers [1] which proposes the use of five factors or dimensions to assess the diffusion speed: relative advantage, compatibility, complexity, triability and observability; the study followed a two-pronged methodology. First I conducted semi-structured interviews and observational analysis; then, I analyzed technological developments, patent activity and firm entry. This study uncovers that 3d-printing something without observing technical requirements is quite easy. But 3d-printing a product that complies with a set of product requirements and specifications, so that the component can then be used in the context of a larger assembly or specific use, is quite another story. Based on observational data this thesis describes the vicissitudes of designing, selecting the printer, setting up the printer's parameters and ultimately printing a component, and thus demonstrates a perspective of the adoptability of this technology.
by Jose M. Garza.
S.M. in Engineering and Management
Tsai, Elizabeth Yinling. "4D printing : towards biomimetic additive manufacturing." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/91821.
Full text"September 2013." Cataloged from PDF version of thesis.
Includes bibliographical references (pages 69-76).
Inherent across all scales in Nature's material systems are multiple design dimensions, the existences of which are products of both evolution and environment. In human manufacturing where design must be preconceived and deliberate, static artifacts with no variation of function across directions, distances or time fail to capture many of these dimensions. Inspired by Nature's ability to generate complex structures and responses to external constraints through adaptation, "4D printing" addresses additive fabrication of artifacts with one or more additional design dimension, such as material variation over distance or direction and response or adaptation over time. This work presents and evaluates a series of enabling explorations into the material, time and information dimensions of additive manufacturing: a variable elasticity rapid prototyping platform and an approach towards Digital Anisotropy, a variable impedance prosthetic socket (VTS) as a case study of interfaces between nature and manufacture, CNSilk as an example of on-demand material generation in freeform tensile fabrication, and Material DNA as an exploration into embedded spatio-temporal content variation.
by Elizabeth Yinling Tsai.
S.M.
Klein, John S. M. Massachusetts Institute of Technology. "Additive manufacturing of optically transparent glass." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101831.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 90-92).
The thesis presents an Additive Manufacturing Enabling Technology for Optically Transparent Glass. The platform builds on existing manufacturing traditions and introduces new dimensions of novelty across scales by producing unique structures with numerous potential applications in product-, and architectural-design. The platform is comprised of scalable modular elements able to operate at the high temperatures required to process glass from a molten state to an annealed product. The process demonstrated enables the construction of 3D parts as described by Computer Aided Design (CAD) models. Processing parameters such as temperature, flow rate, layer height and feed rate, can be adjusted to tailor the printing process to the desired component; its shape and its properties. The research explores, defines and hard-codes geometric constraints and coiling patterns as well as the integration of various colors into the current controllable process, contributing to a new design and manufacturing space. Performed characterization of the printed material to determine its morphological, mechanical and optical properties, is presented and discussed. Printed parts demonstrated strong adhesion between layers and satisfying optical clarity. The molten glass 3D printer as well as the fabricated objects exhibited, demonstrate the production of parts which are highly repeatable, enable light transmission, and resemble the visual and mechanical performance of glass constructs that are conventionally obtained. Utilizing the optical nature of glass, complex caustic patterns were created by projecting light through the printed objects. The 3D printed glass objects and process described here, aim to contribute new capabilities to the ever-evolving history of a very challenging but limitless material - glass.
by John Klein.
S.M.
Go, Jamison. "High-throughput extrusion-based additive manufacturing." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101812.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (pages 171-179).
Additive manufacturing (AM), the process of building objects layer by layer from a three dimensional digital model, is gaining significance due to its ability to create unique geometries and/or novel material compositions while spanning a wide range of length scales. However, the viability of using AM for the production of end-use parts hinges on improvements to production speed without making sacrifices to quality. This thesis seeks to understand the rate-limits to extrusion-based AM, commonly referred to as fused deposition modeling (FDM), and to demonstrate this understanding via the design and fabrication of a high-throughput extrusion AM platform. Three subsystems - the pinch wheel extruder, the conduction liquefier, and the open loop series gantry - were identified as rate limiting to conventional FDM systems via module level experimentation and analysis. These limitations motivated the development of three alternate mechanisms -a screw-feed extruder, a laser-heated extruder, and H-frame gantry - which are designed to overcome the limitations of conventional techniques. These mechanisms are combined into a high-throughput desktop-scale prototype, called FastFDM. Using the FastFDM system, test parts are fabricated at twice the material deposition rate of state-of-the-art machines while maintaining comparable accuracy and resolution. The FastFDM approach has promising future applications to the extrusion AM of nanocomposite polymer resins, high-throughput AM of high performance thermoplastics, and adaptation to large-scale extrusion AM systems.
by Jamison Go.
S.M.
Mellor, Stephen. "An implementation framework for additive manufacturing." Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/15036.
Full textClark, Nicholas. "Microwave methods for additive layer manufacturing." Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/102996/.
Full textHardyman, Micah Dwayne. "Felted Objects via Robotic Additive Manufacturing." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103177.
Full textMaster of Science
In this paper a new approach to Additive Manufacturing centered on mechanically binding fibers together into a cohesive part is presented. This is accomplished via a robotic system and a process called felting, whereby needles push fibers into each other, entangling them. To validate this approach each system and method was tested individually. We present the results of mechanical tests of a variety of felted samples. Given the results, it is believed that robotic needle felting may be a beneficial method of manufacture for several fields, and it has the potential to easily make customized products.
Singh, Manjot. "Conformal Additive Manufacturing for Organ Interface." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/86202.
Full textMaster of Science
Mikler, Calvin. "Laser Additive Manufacturing of Magnetic Materials." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011873/.
Full textMarkusson, Lisa. "Powder Characterization for Additive Manufacturing Processes." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-62683.
Full textWahlström, Niklas, and Oscar Gabrielsson. "Additive Manufacturing Applications for Wind Turbines." Thesis, KTH, Maskinkonstruktion (Inst.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209654.
Full textAdditiv tillverkning, "additive manufacturing" (AM) eller 3D-printing är en automatiserad tillverkningsmetod där komponenten byggs lager för lager från en fördefinierad 3D datormodell. Till skillnad från konventionella tillverkningsmetoder där en stor mängd material ofta bearbetas bort, använder AM nästintill endast det material som komponenten består utav. Förutom materialbesparingar, har metoden ett flertal andra potentiella fördelar. Två av dessa är (1) en stor designfrihet vilket möjliggör produktion av komplexa geometrier och (2) en möjlighet till en förenklad logistikkedja eftersom komponenter kan tillverkas vid behov istället för att lagerföras. Detta examensarbete har utförts på Vattenfall Vindkraft och har till syfte att undersöka om det är möjligt att tillverka och/eller reparera en eller två reservdelar genom AM och om det i så fall kan införa några praktiska fördelar. En kartläggning av komponenter med hög felfrekvens och/eller som kan vara lämpade för AM har genomförts. Av dessa har en roterande oljekoppling även kallad roterskarv valts ut för vidare analys. En omfattande bakgrundsstudie har utförts. En nulägesorientering inom området AM för metaller redogörs, här redovisas även en generell jämförelse mellan konventionella och additiva tillverkningsmetoder. Vidare behandlas aktuella och framtida användningsområden för AM inom vindkraftsindustrin. I bakgrundsstudien behandlas också arbetssättet "reverse engineering", huvudkomponenter i ett vindkraftsverk inklusive roterskarven samt flödesdynamik. Under arbetets gång har en roterskarv med sämre driftshistorik undersökts. I syfte att finna andra konstruktionslösningar som bidrar till en säkrare drift har en bättre presenterande enhet från en annan tillverkare granskats. Då viss detaljteknisk data och konstruktionsunderlag saknas för de undersökta enheterna har "reverse engineering" tillämpats. Ett koncept har sedan utvecklats för den första enheten där förbättrade konstruktionslösningar har introducerats samtidigt som en rad konstruktionsförändringar har gjorts i syfte att minimera materialåtgången och samtidigt anpassa enheten för AM. Konceptet har sedan evaluerats med hjälp av numeriska beräkningsmetoder. För det givna konceptet har även kostnad och byggtid uppskattats. Arbetet visar på att det är möjligt att ta fram reservdelar till vindkraftverk med hjälp av AM. Det framtagna konceptet visar på ett flertal förbättringar som inte kan uppnås med konventionella tillverkningsmetoder. Emellertid finns det en rad begränsningar såsom otillräcklig byggvolym, kostnader och tidskrävande ingenjörsmässigt arbete och efterbehandlingsmetoder. Dessa förbehåll i kombination med avsaknad av 3D-modeller begränsar möjligheterna att nyttja tekniken i dagsläget. Framtiden ser dock ljus ut, om tekniken fortsätter att utvecklas samtidigt som underleverantörer är villiga att nyttja denna teknik kan AM få ett stort genombrott i vindkraftsindustrin.
Strano, Giovanni. "Multi-objective optimisation in additive manufacturing." Thesis, University of Exeter, 2012. http://hdl.handle.net/10871/8405.
Full textSjölund, William. "Volvos next step in additive manufacturing." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-161398.
Full textOne of the fastest growing areas in the manufacturing industry today is additive manufacturing with a large application area that is only getting bigger. Additive manufacturing is when material is added instead of removed in order to produce a part. In connection with the technology being developed, additive manufacturing has become more and more common in the industry where its applications can save companies a large amount of money. An area where additive manufacturing can be shown to be useful is in the production at Volvo GTO, Umeå which is Volvo's leading manufacturer of truck cabins. To investigate whether additive manufacturing can reduce the manufacturing cost, increase the quality of the product or reduce the delivery time at the factory, the investigator has researched what possible cases related to additive manufacturing there is by having meetings and discussions with employees at the factory and finding where the additive technology could be applied. Six cases were found that were investigated. The cases included, among other things, nozzles in the sealing line, vacuum forming templates for the carpentry department and paint distributors on painting robots. The cases were investigated by examining and testing to see which additive technology is best suited for that particular case. When all cases had been investigated thoroughly, an investment priority list was created to create a plan for how the factory should continue its investment in the additive technology. The order on the list is based on what the investigator thought was most important and feasible. The sequence became: FFF printer without locked material system, SLA printer and a MJF printer. It was also found that the factory can save 423 384 SEK a year already by utilizing other additive methods than the one already in place in the factory.
Sandell, Malin, and Saga Fors. "Design for Additive Manufacturing - A methodology." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263134.
Full textAdditiv tillverkning (AM), även kallat 3D-printing, är benämningen på en grupp tillverkningstekniker där en produkt byggs lager för lager. Denna masteruppsats har utförts i samarbete med ett svenskt industriföretag som levererar lösningar inom tillverkningsindustrin, i rapporten kallat Företaget. Genom att utveckla nya designprocesser och metoder vill Företaget inkludera AM i sin tillverkningsstrategi. Syftet med detta masterexamensarbete var att utveckla en metodik för hur urval och utveckling av produkter anpassade för AM ska ske. Utvecklingen av metodiken följer principerna för tjänstedesign, vilket innebär ett holistiskt tvärvetenskapligt arbetssätt där metoder från olika discipliner kombineras för att skapa en positiv upplevelse för slutanvändaren. Innan utvecklingsprocessens start gjordes en stor bakgrundsstudie för att införskaffa kunskaper kring AM. Därefter utvecklades en metod genom fem iterativa cykler där metoder som intervjuer, triggermaterial, frågeformulär, fallstudier och stakeholdermapping användes. Masteruppsatsen resulterade i en handbok med information kring teknikerna och en metodik i fem steg för att välja när och varför AM bör användas som tillverkningsmetod. Första steget är att identifiera AM potentialen hos en produkt, vilket baseras på komplexitet, kundanpassning och produktionsvolym. I steg två ska produktkrav specificeras, exempel på sådana krav är ytfinhet och toleranser. Tredje steget i metoden handlar om en produkt-undersökning under vilken ett slutgiltigt beslut fattas angående om produkten kan och bör tillverkas. I fjärde steget sker valet av teknik baserat på de produktkrav som specificerats i steg två, genom att information ges angående teknikens möjligheter och begränsningar. Femte steget i metoden handlar om designen av AM produkter och förser konstruktören med enklare riktlinjer för designen. Utveckling av en metodik kräver ett dynamiskt arbetssätt och principerna inom service design visade sig passa bra för detta projekt. Det visade sig också att den resulterade metodik behöver kompletteras med information i framtiden. Det behövs även fastställas tydliga mål för AM i företaget och vilket syfte implementeringen av denna nya process innebär
Lami, Isacco. "Ottimizzazione di strutture reticolari in additive manufacturing." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Find full textMohamad, Khan Shah Fenner. "Novel indirect additive manufacturing for processing biomaterials." Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/3022.
Full textCunningham, Victor, Christopher A. Schrader, and James (Trae) Young. "Navy additive manufacturing: adding parts, subtracting steps." Thesis, Monterey, California: Naval Postgraduate School, 2015. http://hdl.handle.net/10945/45834.
Full textThis study examines additive manufacturing (AM) and describes its potential impact on the Navy’s Supply Chain Management processes. Included in the analysis is the implementation of 3D printing technology and how it could impact the Navy’s future procurement processes, specifically based on a conducted analysis of the automotive aerospace industry. Industry research and development has identified multiple dimensions of AM technology, including material variety, cost saving advantages, and lead-time minimizations for manufacturing products. This project is designed to provide the Navy with a recommendation based on an in-depth industry case-study analysis.
Karmakar, Mattias. "Additive Manufacturing Stainless Steel for Space Application." Thesis, Luleå tekniska universitet, Materialvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-72901.
Full textByron, Andrew James. "Qualification and characterization of metal additive manufacturing." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104315.
Full textThesis: S.M. in Engineering Systems, Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2016. In conjunction with the Leaders for Global Operations Program at MIT.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 119-123).
Additive manufacturing (AM) has emerged as an effective and efficient way to digitally manufacture complicated structures. Raytheon Missile Systems seeks to gain limited production capability with metals AM, which can only be achieved with qualified, predictable processes that reduce variation. The project documented in this thesis produced two results needed to qualify AM for use on flight-critical parts: i) creation of a standard qualification process building upon Raytheon's product development knowledge, and ii) selection and identification of key metals AM process factors and their corresponding experimental responses. The project has delivered a qualification test plan and process that will be used next year to drive adoption and integration of Raytheon's metals AM technology. The first phase of the designed experiment on AM process factors was completed by experimenting with coupon orientation, position on the build platform, coupon shape and hot isostatic pressing (HIP) post-treatment for an Al alloy (AlSi10Mg) produced via laser powder bed fusion using 400-watt laser equipment. Only coupon orientation had a statistically significant effect on dimensional accuracy, increasing the variance of y-axis (within the build plane) error by ~50%, although this is considered a small increase. HIP decreased yield and ultimate stresses by ~60% while increasing ultimate strain by ~250%. Vertical orientation of coupons decreased yield and ultimate stresses by ~25% and increased ultimate strain by ~30%. Small coupon area on the build platform, associated with thin rectangle coupons, decreased yield stress and ultimate strain by ~5%. The processes and case study from this thesis represent a general advance in the adoption of metals AM in aerospace manufacturing.
by Andrew James Byron.
M.B.A.
S.M. in Engineering Systems
Cersoli, Trenton M. "Shape Memory Polymers Produced via Additive Manufacturing." Youngstown State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1619817489890187.
Full textChiu, Brendon W. "Additive manufacturing applications and implementation in aerospace." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/126950.
Full textThesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 107-108).
Many aerospace companies are turning to additive manufacturing solutions to stream-line current production processes and open opportunities for on-demand producibility. While many OEMs are drawn to the appeal of the benefits that additive manufacturing brings, they are beginning to understand the difficulties in what it takes to realize those benefits. This paper analyzes additive manufacturing from an industry perspective down to a company perspective to develop a deeper understanding of the practical use cases as well as the various challenges a company faces should they choose to enter this market. This study begins with market research on the additive manufacturing and aerospace industry before honing in on a several use-case parts from rotary aircraft. Selection criterion were created and applied to analyze the value that additive manufacturing would bring in comparison to that of conventional methods, ultimately determining its feasibility for additive manufacturing.
This study applied the selection criterion to various parts of differing functions among the aircraft, resulting in a group of candidate parts. An evaluation method was created and applied to provide an objective assessment on the candidate parts. Initial insights show that additive manufacturing favor casted parts with features that can be optimized to increase performance and reduce costs and weight. In addition, aerospace has the best product mix of low volume parts that are advantageous to the economies of scale for additive manufacturing. Additionally, this study analyzes a company's organization and previous additive manufacturing efforts to propose ways to approach future development. Venturing through the various road maps that lead to the final goal of certification and addressing organizational barriers generate momentum for continuous development.
These road maps, selection criterion, and evaluation method can be applied through many applications within the general aerospace industry.
by Brendon W Chiu.
M.B.A.
S.M.
M.B.A. Massachusetts Institute of Technology, Sloan School of Management
S.M. Massachusetts Institute of Technology, Department of Mechanical Engineering
Tenney, Charles M. "Impedance-based Nondestructive Evaluation for Additive Manufacturing." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/99966.
Full textDoctor of Philosophy
Impedance-based Non-Destructive Evaluation for Additive Manufacturing (INDEAM) is a quality control approach for detecting defects in structures. As indicated by the name, impedance-based evaluation is discussed in this work in the context of qualifying additively manufactured (3D printed) structures. INDEAM fills a niche in the wider world of nondestructive evaluation techniques by providing a less expensive means to qualify structures with complex geometry. Complex geometry complicates inspection by preventing direct, physical access to all the surfaces of a part. Inspection approaches for parts with complex geometry suffuse a structure with energy and measure how the energy propagates through the structure. A prominent technique in this space is CT scanning, which measures how a structure attentuates x-rays passing through it. INDEAM uses piezoelectric materials to both vibrate a structure and measure its response, not unlike listening for the dull tone of a cracked bell. By applying voltage across a piezoelectric patch glued to a structure, the piezoelectric deforms itself and the bonded structure. By monitoring the electrical current needed to produce that voltage, the ratio of applied voltage to current draw---impedance---can be calculated, which can be thought of as a measure of how a system stores and dissipates energy. When the applied voltage oscillates near a resonant frequency of a structure (the pitch of a rung bell, for example) the structure vibrates much more intensely, and that additional movement dissipates more energy due to viscosity, friction, and transmitting sound into the air. This phenomenon is reflected in the measured impedance, so by calculating the impedance value over a large range of frequencies, it is possible to identify many resonances of the structure. So, the impedance value is tied to the vibrational properties of the structure, and the vibration of the structure is tied to its geometry and material properties. One application of this relationship is called impedance-based structural health monitoring: taking measurements of a structure when it is first built as a reference, then measuring it again later to watch for changes that indicate emerging damage. In this work, the reference measurement is established by measuring a group of control structures that are known to be free of defects. Then, every time a new part is fabricated, its impedance measurements will be compared to the reference. If it matches closely enough, it is assumed good. In both cases, impedance values don't indicate what the change is, just that there was a change. A large portion of this work is devoted to determining the types and sizes of defects that can be reliably detected through INDEAM, what effect the part material plays, and how and where the piezoelectric should be mounted to the part. The remainder of this work discusses new methods for conducting impedance-based evaluation. In particular, overcoming the extra uncertainty introduced by moving from part-to-itself structural health monitoring comparisons to the part-to-part quality control comparisons discussed in this work. A new method for mathematically comparing impedance values is introduced which involves extracting the resonant properties of the structure rather than using statistical tools on the raw impedance values. Additionally, a new method for assessing the influence of piezoelectric mounting conditions on the measured impedance values is demonstrated.
Ramakrishna, Yogendra Jayanth. "Image Analysis Methods For Additive Manufacturing Applications." Thesis, Högskolan Väst, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-15891.
Full textSchick, David E. "Characterization of Aluminum 3003 Ultrasonic Additive Manufacturing." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1259773538.
Full textBrant, Anne. "An Explorative Study of Electrochemical Additive Manufacturing." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470672617.
Full textMelpal, Gopalakrishna Ranjan. "Conformal Lattice Structures in Additive Manufacturing (AM)." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535382325233769.
Full textYannetta, Christopher James. "Additive Manufacturing of Metastable Beta Titanium Alloys." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011883/.
Full textEyers, Daniel. "The flexibility of industrial additive manufacturing systems." Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/74425/.
Full textAkande, Stephen Oluwashola. "Development of quality system for additive manufacturing." Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/2831.
Full textHong, Zhihan, and Rongguang Liang. "IR-laser assisted additive freeform optics manufacturing." NATURE PUBLISHING GROUP, 2017. http://hdl.handle.net/10150/625522.
Full textPORAT, INGRID, and KLARA HOVSTADIUS. "A Business Model Perspective on Additive Manufacturing." Thesis, KTH, Industriell Management, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-239665.
Full textAdditiv tillverkning (AM) är en omogen tillverkningsteknik som anses ha potential att kraftigt påverka den tillverkande industrin och många företag närmar sig nu AM för att undersöka hur de kan ta en stark position på marknaden. Teknologiska innovationer i sig är ofta otillräckliga för att till fullo utnyttja fördelar med ny teknik och därför krävs även innovation av affärsmodeller. Det kan vara svårt för företag att hitta argument och stöd för hur en affärsmodell inom AM ska struktureras, det vill säga avgöra vad som ska erbjudas och till vem (value proposition), hur erbjudandet ska levereras (value creation) och hur vinsten ska tillvaratas (value capture). Därför undersöker den här studien hur stora tillverkande företag möter den växande AM-marknaden utifrån ett affärsmodellsperspektiv. Forskningen påvisar gemensamma teman inom tre affärsmodellskomponenter (value proposition, value creation, value capture) i en AM-kontext, där tema 5 motsägs både av teorin och av flera andra teman: 1. Omogen efterfrågan 2. Starta med interna uppdrag 3. Kunskapserbjudanden 4. Helhetslösningar 5. Brett kundfokus 6. Börja i en tekniknisch, expandera sedan 7. Investera i maskiner för att bygga kunskap 8. Behov av förändring i designers tankesätt 9. Partnerskap för att driva AM-marknaden framåt 10. Maktpositionen skiftar 11. Nära kundrelationer 12. Det pågår ett race till marknaden Forskningen är baserad på en multipel fallstudie som inkluderar 16 intervjuer på sex olika företag och två universitet.
Damerji, Daniel. "Potential in additive manufacturing of a shaft." Thesis, KTH, Hållfasthetslära (Inst.), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254624.
Full textGardner, John Michael. "Additive Manufacturing of Nanomaterial Based Hierarchical Structures." W&M ScholarWorks, 2019. https://scholarworks.wm.edu/etd/1563899002.
Full textSauter, 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.
Full textRistovski, Nikola. "Melt electrospinning as an additive manufacturing technique." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/118057/1/Nikola_Ristovski_Thesis.pdf.
Full textPrakash, Shyam Geo. "Application Based Design for Additive Manufacturing : Development of a systematic methodolgy for part selection and design for Additive Manufacturing." Thesis, KTH, Industriell produktion, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-287190.
Full textAdditiv tillverkning (AT) är en tillgänglig teknologi som har fått mycket uppmärksamhet under de senaste decennierna och som för närvarande är på väg från prototypappliceringar till småskalig produktion. Den slutgiltiga komponenten är framställd genom att addera lager på lager och medför därmed vida möjligheter såsom designfrihet, flexibilitet och optimal materialanvändning, etc. Med anledning av snabba tekniska framsteg inom AT vad gäller hastighet, dimensionell noggrannhet, ytfinish och repeterbarhet, möjliggörs produktion av funktionella slutprodukter i tolerabla volymer. Forskningen är genomförd i samarbete med Atlas Copco Industriell Teknik (ACIT) med syfte att utforska vägen mot användning av AT som ett verktyg vid låga produktionsvolymer. I nuläget används AT flitigt för att skapa prototyper inom ACIT. Syftet med detta masterprojekt är därför att undersöka och rekommendera en designmetodik samt riktlinjer för att skifta från prototypappliceringar till småskalig produktion med AT. Emellertid kräver en introduktion av AT för småskalig produktion eftertanke redan i de inledande stadierna av produktutvecklingen. Till att börja med utfördes en grundlig bakgrundstudie för att omfatta AT som teknologi och dess nuvarande framsteg med avseende på teknologisk mognad och marknadsaspekter. Bakgrundsstudien innehåller litteraturstudie, marknadsstudie, intervjuer, besök hos tjänsteleverantörer av AT, utställningar med fokus på AT, etc. Marknadsundersökningen understödde ett fokus av studien mot två teknologier, nämligen Selektiv Lasersmältning (Selective Laser Melting) och Bindemedelstrålning (Binder Jetting). Med anledning av dagens begränsningar inom AT är inte alla typer av komponenter passande kandidater för att undersöka potentialen av teknologin. Med detta i beaktande förbereddes frågeformulär, baserade på litteraturstudien, som sedan användes för att med hjälp av mekaniska designers vid R&D i Nacka, identifiera potentiella komponenter att använda för AT. Den föreslagna metodiken för att undersöka komponenter kategoriserar komponenter genom tre drivande kriterier och leder i därefter till en teknisk och ekonomisk utvärdering. Genom en bottom-up approach för undersökande av komponenter, identifieras och omdesignas komponenter med högst potential för AT, vilket främjar en lämplig design för AT. Dessutom användes dessa komponenter för att föreslå en designmetodik samt riktlinjer som kan vara till hjälp för designers vid design av komponenter för AT. Designmetodiken innefattar följande fyra steg: informationsfas, bedömningsfas, designfas och detaljerad designfas. Masterprojektet resulterade i val och omdesign av komponenter med potential för AT samtidigt med värdeaddering genom sammanslagning av komponenter, design med lätt vikt genom optimering av topologi och kostnadsminskning, etc. Ju tidigare beaktande av produktionsmetod i utvecklingsfasen, desto bättre slutdesign med avseende på producerbarhet. Detta är en kritisk aspekt när det kommer till AT, eftersom komplexitet nästintill adderas kostnadslöst. Därför kan en simulationsdriven designprocess, i vilken utvecklingen börjar med ett optimerat koncept eller ett koncept designat för funktion, komma i produktion och maximalt utnyttja fördelarna av AT.
Ek, Kristofer. "Additive Manufactured Material." Thesis, KTH, Maskinkonstruktion (Inst.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156887.
Full textDet här projektet behandlar området Additiv Tillverkning (AM) för metalliska material och undersöker om det är lämpligt att använda vid produktion inom flygindustrin. AM är en relativt ny tillverkningsmetod där föremål byggs upp lager för lager direkt ifrån en datormodell. Teknikområdet tillåter i många fall större konstruktionsfriheter som möjliggör tillverkning av mer viktoptimerade och funktionella artiklar. Andra fördelar är materialbesparing och kortare ledtider vilket har ett stort ekonomiskt värde. En omfattande litteraturstudie har gjorts för att utvärdera alla tekniker som finns på marknaden och karakterisera vad som skiljer de olika processerna. Även maskiners prestanda och kvalité på tillverkat material utvärderas, och för varje teknik listas möjligheter och begränsningar. Teknikerna delas grovt upp i pulverbäddsprocesser och material deposition-processer. Pulverbäddsteknikerna tillåter större friheter i konstruktion, medan material deposition-processerna tillåter tillverkning av större artiklar. Den vanligaste energikällan är laser som ger ett starkare men mer sprött material än de alternativa energikällorna elektronstråle och ljusbåge. Två specifika tekniker har valts ut för att undersöka närmare i detta projekt. Electron Beam Melting (EBM) från Arcam och Wire fed plasma arc direct metal deposition från Norsk Titanium (NTiC). EBM är en pulverbäddsprocess som kan tillverka färdiga artiklar i begränsad storlek då låga krav ställs på toleranser och ytfinhet. NTiC använder en material deposition-process med en ljusbåge för att smälta ner trådmaterial till en nära färdig artikel. Den senare metoden är mycket snabb och kan tillverka stora artiklar, men måste maskinbearbetas till slutgiltig form. En materialundersökning har genomförts där Ti6Al4V-material från båda teknikerna har undersökts i mikroskop och testats för hårdhet. För EBM-material har även ytfinhet och svetsbarhet undersökts då begränsad byggvolym i många fall kräver fogning. Materialen har egenskaper bättre än gjutet material med avseende på styrka och duktilitet, men inte lika bra som valsat material. Provning visar att skillnaden på mekaniska egenskaper i olika riktningar är liten även fast materialet har en inhomogen makrostruktur med kolumnära korn i byggriktningen. EBM ger en finare mikrostruktur och ett starkare material och, tillsammans med de ökade konstruktionsfriheterna, så är det den tekniken som är bäst lämpad för flygplansartiklar då svetsbarheten är god och det finns möjlighet att bearbeta ytan till slutgiltigt krav. Nyckelord: Additiv Tillverkning, Flygteknik, Titan