Dissertations / Theses on the topic 'Aluminium foam'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Aluminium foam.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
McKown, Simon Thomas. "The progressive collapse of novel aluminium foam structures." Thesis, University of Liverpool, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414813.
Full textAinsworth, Mark J. "Metal-foam interface stability during the filling of lost foam moulds with aluminium alloys." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1481/.
Full textIdris, Maizlinda Izwana Materials Science & Engineering Faculty of Science UNSW. "Structural integrity of carbon fibre/aluminium foam sandwich composites." Awarded By:University of New South Wales. Materials Science & Engineering, 2010. http://handle.unsw.edu.au/1959.4/44722.
Full textCurran, David Charles. "Aluminium foam production using calcium carbonate as a foaming agent." Thesis, University of Cambridge, 2004. https://www.repository.cam.ac.uk/handle/1810/252945.
Full textStyles, Millicent, and milli styles@anu edu au. "Characterisation of the flexural behaviour of Aluminium Foam Sandwich Structures." The Australian National University. Faculty of Engineering and Information Technology, 2008. http://thesis.anu.edu.au./public/adt-ANU20080813.170807.
Full textTan, Serdar. "Optimization Of Macrostructure In Aluminium Foams." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/2/1011196/index.pdf.
Full textm and 3µ
m. It has been confirmed that high level of compaction is the primary requirement in foaming. It was shown that hot swaging could be used as a method of compaction for foaming as it leads to values close to full density. Pure aluminium foamed at 675°
C and 725°
C leads to a volume expansion between 90-180 %. A model was developed for pure aluminium to explain the pore initiation and the resultant pore size. The model predicts a critical particle size for TiH2 below which bubbles could not form. The size appears to be in the neighborhood of 30µ
m for 675°
C and 6µ
m for 725°
C and is temperature dependent. Equilibrium pore size appears to be a function of TiH2 particle size and not affected significantly by the temperature of foaming. It has also been shown that depth effect, i.e. hydrostatic pressure of liquid metal, is unimportant in foaming process and can be neglected. According to the model, to produce pores of fine sizes, two requirements must be met: use of fine foaming agent and the use of high foaming temperature. Al-5 wt % TiO2 was foamed at 750°
C and 800°
C, i.e. at temperatures that yield viscosities similar to pure aluminium. The structure of foamed metal and level of foaming, 120-160%, was similar to pure aluminium. Unlike pure aluminium, internal reactions are dominant feature of TiO2 stabilized systems. Solid content of the system increases as a result of internal reactions between Al-Ti and Al- TiO2. When this change occurs, however, is not known. It is possible that the viscosity of the system may be four times of its original value.
Styles, Millicent. "Characterisation of the flexural behaviour of aluminium foam composite sandwich structures /." View thesis entry in Australian Digital Theses Program, 2008. http://thesis.anu.edu.au/public/adt-ANU20080813.170807/index.html.
Full textMustaffar, Ahmad Fadhlan Bin. "Irregular aluminium foam and phase change material composite in transient thermal management." Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3338.
Full textBetts, Charles. "Structural integrity of open-cell aluminium foam sandwich panels for lightweight wing structures." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/17995.
Full textKubilay, Ceylan. "Effect Of Tih2 Particle Size On Foaming Of Aluminium." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606897/index.pdf.
Full textnamely 27,5 &
#61549
m and 8,5 &
#61549
m. Foaming experiments were carried out at temperatures between 675oC &ndash
840oC. The viscosity of the system is adjusted by controlled addition of Al2O3. The study shows that choice of foaming agent size is influential in the foaming process. With the use of fine foaming agent, temperatures in excess of 800oC would be required for successful foaming. The study further showed that the relation between foaming and viscosity was also dependent on the particle size. Viscosity of 2.3 mPa.s was found to be a limiting value for successful foaming with fine foaming agent. This value appears to increase with increasing particle size. An analysis is presented with regard to temperature dependence of foaming which takes into account the effect of particle size.
Ribeiro, Daniel Tadeu de Carvalho. "Estudo da viabilidade técnica do processo de fabricação de espumas metálicas por reciclagem de cavacos da liga AA356." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263567.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
Made available in DSpace on 2018-11-08T18:35:02Z (GMT). No. of bitstreams: 1 Ribeiro_DanielTadeudeCarvalho_M.pdf: 21302819 bytes, checksum: 8a7a0a9d878be3b8ccb6833173c35aef (MD5) Previous issue date: 2011
Resumo: Este trabalho tem como objetivo desenvolver um método alternativo para a fabricação de espumas metálicas pela reciclagem de cavacos de Al e a caracterização mecânico-metalúrgica do produto obtido. O processo investigado envolve a espumagem de compactados de misturas de cavacos e pó de agente espumante, com a espumagem ocorrendo na liga em estado semi-sólido tixotrópico. Foram fabricados precursores espumáveis pela mistura de cavacos da liga de Al AA356, com duas distintas granulometrias, a 1,5wt% do agente espumante TiH2 e posterior compressão também em duas distintas condições: compressão simples a frio e compressão dupla, a frio e a quente. Os elementos precursores foram aquecidos, sofrendo espumagem em estado semi-sólido, pela dissociação do agente espumante formando gás H2 no interior do metal. As espumas metálicas produzidas foram analisadas quanto à sua qualidade interna, arquitetura celular (dimensões, geometria de poros, espessura de paredes metálicas), propriedades físicas (densidade, teor de porosidade, condutividade e difusividade térmicas) e mecânicas em compressão semi-estática. O comportamento mecânico em compressão e o comportamento térmico das espumas produzidas foram também estimados teoricamente utilizando modelos da literatura. Os resultados obtidos mostraram que o processo proposto é eficaz para a produção de espumas de boa qualidade. Os melhores resultados são obtidos com o emprego de compactação dupla e espumagem direcional do precursor. Não foi possível observar influência das dimensões dos cavacos utilizados, na faixa de tamanhos empregada, nas características e propriedades das espumas produzidas. O comportamento das espumas metálicas sob compressão semi-estática demonstrou a formação de um platô de deformação plástica ascendente, o que indica uma grande capacidade de absorção de energia mecânica; todas as amostras apresentaram condutividade térmica bastante inferior e difusividade superior à do metal maciço, representando boas propriedades isolantes térmicas. Os valores de propriedades mecânicas estimadas teoricamente diferem dos obtidos experimentalmente, indicando necessidade de cuidado no emprego destes modelos
Abstract: This work aims to develop an alternative method for manufacturing metal foams by Al alloy machined chips recycling and mechanical and metallurgical characterization of the product. The process investigated involves foaming a compressed mixture of Al chips and foaming agent powder, with foaming occurring with the alloy in semi-solid thixotropic state. Foamable precursors were manufactured by mixing Al alloy A356 machined chips in two different particle sizes, to 1.5 wt% of the foaming agent TiH2 and its posterior compression also in two distinct conditions: simple cold compression and double compression, cold and hot. The precursors were heated, being foamed in semisolid state, by dissociation of the foaming agent generationg H2 into the bath. The internal quality, cellular architecture (pore size and geometry, cell wall thickness), physical properties (density, porosity level, thermal conductivity and thermal diffusivity) and mechanical behaviour under semi-static compression were analyzed for the metal foams produced. The mechanical behavior under compression and thermal behavior of the foams produced were also calculated using theorical models from literature. The results showed that the procedure proposed is effective for the production of foams of good quality. The best results are obtained foaming directionaly precursors manufactured by double compression. It was not possible to observe the influence of the dimensions of the machined chips, considering the size range adopted, on the characteristics and properties of the foams produced. The mechanical behavior of metallic foams under semi-static compression showed the formation of a ascendent plateau of plastic deformation, which indicates a great capacity of absorbing mechanical energy; all samples showed significantly lower thermal conductivity and diffusivity compared to the solid metal, what represents good thermal insulation properties. The theorical estimative of the sample's mechanical properties differ from those obtained experimentally, indicating that the matematical models proposed has to be used carefully
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
Barbakadze, Archil. "Untersuchung des Einflusses der Gießparameter auf die Porosität bei Aluminium-Vollformgussteilen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2009. http://nbn-resolving.de/urn:nbn:de:swb:105-1725160.
Full textSiavashi, Kiavash. "The effect of casting parameters on the fluidity and porosity of aluminium alloys in the aost foam casting process." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3525/.
Full textGUGLIELMOTTI, ALESSANDRO. "Tecnologia delle strutture cellulari." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2010. http://hdl.handle.net/2108/1203.
Full textPorosity in dense engineering materials is often undesirable for load-bearing applications. However, porosity is highly beneficial for weight and cost reduction, damping, thermal insulation and specific strength. Moreover, porous materials are extensively used in several industrial applications: automotive, aeronautics, and naval. In the last years, the attention has been focused on new materials because of the combination of high performances and low weight. Cellular materials were initially produced by means of organic compounds: recently, technologies for the processing of metallic cellular materials have been introduced as well. In the present work, a new foaming process is described for thermosetting resins. Uncured resin tablets are fabricated by pressing commercial powders in a steel mould at room temperature, and used as foam precursors. The tablets foam when heated in a muffle at high temperature. No blowing agent is added as the foaming mechanism depends on the uncured resin boiling point. The foaming temperature is set to be high enough to rapidly produce the resin boiling but not excessive to avoid the thermal degradation. During boiling, the resin polymerizes and the bubbles froze in the final structure. By means of this technology, composite and nano-composite foams may be produced as well. In fact, before compaction, the resin powder may be easily mixed with several fillers such as ceramic or metallic micro and nano-particles. As regards the aluminium foams, a new foaming technology was also proposed to produce open-cell aluminium foams by “replication”. Particularly, the process consisted of four main steps: the preparation of a pre-form of sodium chloride (NaCl); the infiltration of the pre-form with molten aluminium; the metal solidification; the water dissolution of the salt. Coarse NaCl grains were used to produce the pre-forms and the mechanical properties of the solidified foams were evaluated. In conclusion, a different method to shape commercial metallic foam panels was proposed by using a diode laser. Open- and closed-cell panels were laser bent and the effect of the main process parameters (laser power and scan velocity) on the bending efficiency was investigated. As a result, a very good formability was observed for the laser processed panels.
Delbin, Daniel. "Estudo da viabilidade de produção de esponjas da liga A2011 a partir do estado semi-solido." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263622.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-11-08T18:37:47Z (GMT). No. of bitstreams: 1 Delbin_Daniel_M.pdf: 8551361 bytes, checksum: 770e9d00eeb959cc6e40cf3f314faa4e (MD5) Previous issue date: 2006
Resumo: Neste trabalho é estudada a viabilidade de produção de esponjas metálicas pela conformação de pasta tixotrópica da liga A2011, sobre camada de agente bloqueador (NaCl) posteriormente removido para formação da porosidade. Investiga-se a influência da temperatura de tratamento térmico, para obtenção da pasta semi-sólida, e da granulometria do agente bloqueador, na estrutura formada do material celular (aspecto geral, caracterização qualitativa e quantitativa dos poros, microestrutura da parede celular e densidade) e nas características de processo (forças de tixoforjamento e capacidade de penetração da pasta). São produzidos cilindros de material poroso metálico tipo sanduíche, compostos de camada porosa entre camadas maciças da liga, com três diferentes classes de porosidade: fina, média e grosseira. As esponjas foram submetidas à tomografia computadorizada e à análise metalográfica para sua caracterização estrutural. Os resultados obtidos mostram a viabilidade de obtenção de esponjas metálicas utilizando a tecnologia de semi-sólidos e o tipo de bloqueador utilizado. O sucesso do processo depende da fração líquida presente na pasta metálica tixotrópica, reduzida fração líquida pode resultar em incompleta infiltração e compressão das partículas do agente bloqueador. Nas condições analisadas a granulometria do agente bloqueador não teve influência sensível na qualidade do produto. A densidade do material poroso aumenta com o aumento da temperatura de processo, devido ao aumento da espessura de paredes metálicas na estrutura porosa
Abstract: The work analyses the possibility of the production of cellular material by pressing the A2011 alloy in the thixotropic semi-solid state, into a space holder pre-form. Space holder particles used are NaCl, which are removed from the product after the forming operation, resulting the porous material. It is investigated the influence of the thixoforming temperature and the size of space holder particles, in the structure of the obtained porous material (general aspect, quantitative and qualitative characterization of porosity, microstructure of cell walls and density of the product), as well as in the processing characteristics (required forces for infiltration, penetration ability of the slurry in the salt pre-form). Cylindrical samples, sandwich type, with a porous layer inserted between layers of compact alloy are produced, presenting three different ranges of porosity. The cellular material obtained contains opened porosity, being characterized as sponge. Products were analyzed by tomography and metallographic techniques. Results show that the proposed process is able to produce acceptable porous material, with a simple and low cost technique. The quality of the product depends rather on the processing temperature than on the size of space holder particles. Low liquid fraction in the thixotropic slurry can lead to incomplete infiltration and deformation of the pre-form. In the analyzed conditions, influence of the size of space holder particles could be observed neither in the processing ability nor in the quality of the product. Density of produced porous material increases as processing temperature increases, due to the increase of thickness of cell walls
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
Bilík, Michal. "Návrh předního deformačního členu vozidla Formule Student." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230252.
Full textRodrigues, Tiago Alexandre Morais. "Tubes reinforced with foams with density gradients." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/17994.
Full textEstudos na área dos materiais têm desempenhado um importante papel na indústria automóvel. Com o tempo, a utilização de materiais pesados tem vindo a ser substítuido por materiais mais leves como ligas de aço avançados, ligas de alumínio e compósitos. Quanto mais leves forem as estruturas, melhor o seu desempenho em termos de consumo de combustível e emissão de gases. No entanto, as estruturas necessitam de manter a sua integridade, assegurando a segurança activa e passiva dos ocupantes. Sendo assim, este estudo concentra-se em estudar o comportamento mecânico à compressão de tubos de alumínio preenchidos com espumas de alumínio. As espumas fechadas são produzidas através do método de pulverotecnologia ao passo que as espumas abertas são fabricadas com recurso à técnica de fundição de precisão. Este estudo passa também pela análise de espumas abertas preenchidas com polímeros, neste caso silicone e epóxido, comummente chamadas espumas híbridas. Os testes de compressão foram realizados em condições quasi-estáticas e dinâmicas, sendo analisados com recurso a uma técnica não destrutiva (Termografia Infravermelha), na qual se obtêm imagens térmicas (termogramas), utilizados no estudo dos modos de deformação. A análise dos resultados passa não só pelo estudo dos modos de deformação mas também da sua influência na capacidade de absorção de energia, mas também na ocurrência de fendas e fracturas. Os resultados demonstram que os tubos preenchidos com espumas de alumínio de porosidade fechada durante a etapa de formação da própria espuma, designados in-situ, são aqueles que garantem melhor resposta mecânica, tendo um comportamento mais estável e prevísivel.
Research in materials has been playing and important role in automotive industry. With time, the use of heavier material is being replaced by lighter materials such as advanced steel alloys, aluminium alloys and composites. The lighter the structures the better in terms of fuel consumptions and gas emission’s reduction. However, these structures have to maintain their reliability, ensuring active and passive security to vehicles passengers. Therefore, this study concentrates on studying the mechanical behaviour of aluminium tubes filled with aluminium foams under compression. The closed foams are produced through a powder metallurgical method, while the open-cell foams are produced through investment casting. This study also focuses on the study of open-cell foams embedded with polymers, silicone and epoxy, commonly called ’Hybrid Foams’. Compression tests are made under quasi-static and dynamic conditions, and analysed with non-destructive technique (Infrared Thermography), which allows to obtain thermal images (thermogrames), used to study the deformation modes. The analyses of the results passes not only through the study of the deformation modes but also focuses on its influence in energy absorption capability, as well as in the occurrence of cracks and fractures. The results show that foam filled tubes with closed-cell, expanded inside the tube itself ( designated as in-situ), ensures a better mechanical response, due to its more stable and predictable behaviour.
Yüksel, Sinan Güden Mustafa. "Crushing behaviour of aluminum foam-filled composite tubes/." s.l.]: [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/makinamuh/T000380.pdf.
Full textKeywords:crushing, aluminum foam, foam filling, energy absorber, composite tubes. Includes bibliographical references (leaves. 93-96).
Keltner, Noelle Joy. "Study of PocoFoam (TM) as a heat exchanger element in cryogenic applications." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51774.
Full textMerrett, Richard Peter. "Dynamic response of aluminium foams." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/10739.
Full textAkseli, Ilgaz Güden Mustafa. "The application of aliminum foam for the heat and noise reduction in automobiles/." [s.l.]: [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/makinamuh/T000343.pdf.
Full textKeywords: Aluminum matrix composites, thermal conductivity, sound insulation, foam, metal matrix composites, aluminum foam. Includes bibliographical references (leaves. 77-81).
Zaragoza, Gael. "Aluminium foams for heat transfer applications." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/3882/.
Full textJoesbury, Adam Michael. "New approaches to composite metal joining." Thesis, Cranfield University, 2015. http://dspace.lib.cranfield.ac.uk/handle/1826/10009.
Full textKavi, Halit Güden Mustafa. "Investigation of compression mechanical behaviour of aluminum foam filled metal tubes/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/makinamuh/T000488.pdf.
Full textNammi, Sathish Kiran. "Finite element analysis of aluminium foams under compressive loading." Thesis, University of Bolton, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573674.
Full textSenior, Faye. "The development of aluminium foams for enhanced heat transfer." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/18317/.
Full textSantosa, Sigit P. "Crash behavior of box columns filled with aluminum honeycomb or foam." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10484.
Full textBartolucci, Stefano 1976. "Commercial application of aluminum honeycomb and foam in load bearing tubular structures." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28868.
Full textIncludes bibliographical references.
Small dimension engineering tubular structures subjected to a complex load system are designed like hollow circular shells. For minimum weight design, the ratio between the shell radius and the thickness has to be as large as possible, but its maximum value is limited by the onset of local buckling. Tubular natural structures subjected to a complex load system have often an outer shell of solid material supported by a low density, compliant core, which makes them more resistant to local buckling. Biomimicking of natural constructions offer the potential to improve the design of small diameter tubular engineering structures. Here, the fabrication technology of biomimicked engineering tubular structures integrating aluminum foam or honeycomb as core material is discussed. A viability analysis is presented including technical performance, cost, utility, and risk assessments. Aluminum compliant core shells have potential for substituting CFRP and aluminum tubular structures in aerospace and high-level sport applications. The case of sailboat masts was considered in detail. Results of our analysis proved that use of honeycomb as core material can lead to a significant reduction of the mast weight. Business opportunities based on this application are discussed.
by Stefano Bartolucci.
M.Eng.
Mutsakatira, Innocent. "The effect of the surface condition of Aluminium ingot (AA3003) during roll bonding with clad Aluminium alloy (AA4045) to form an Aluminium brazing material." Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/32875.
Full textMartinec, Pavel. "Návrh bezpečnostních prvků vozidla Formule Student." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229847.
Full textVelay, Xavier. "Analysis of the conform process : a specific form of aluminium extrusion." Thesis, Bournemouth University, 2004. http://eprints.bournemouth.ac.uk/432/.
Full textAl, Tenaiji Mohamed. "Characterisation of aluminium matrix syntactic foams under static and dynamic loading." Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/18857/.
Full textMariani, Laura Leana. "Electroless coatings on titanium hydride for use in the production of aluminum foam." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99525.
Full textThis problem may be overcome by delaying the temperature of hydrogen evolution so that it coincides with the melting point of aluminum. Coating the titanium hydride with copper or nickel can create a kinetic barrier that retards the flow of hydrogen into the surrounding matrix.
Electroless plating is a process that can be used to deposit metallic coatings on non-conductive materials. Metallic ions in solution are reduced by a suitable agent, creating a metal deposit on the substrate. The process is autocatalytic and continues until all the metallic ions are consumed.
The objective of this work was to investigate the effect of the copper and nickel coatings on the hydrogen evolution of titanium hydride powders. It was found that the metal coatings do tend to delay the temperature of gas release and that this could potentially be used to improve the foaming process.
Toksoy, Ahmet Kaan Güden Mustafa. "Quasi-static axial compression behavior of empty and polystyrene foam filled aluminum tubes/." [s.l.]: [s.n.], 2003. http://library.iyte.edu.tr/tezler/master/makinamuh/T000246.rar.
Full textVendra, Lakshmi Jyotshna. "Processing and Characterization of Aluminum-Steel Composite Metal Foams." NCSU, 2008. http://www.lib.ncsu.edu/theses/available/etd-05282008-163908/.
Full textElbir, Semih Güden Mustafa. "Preparation and characterization of aluminum composite closed-cell foams/." [s.l.]: [s.n.], 2001. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000022.pdf.
Full textZhang, Chuan. "Aluminum foams composite : elaboration and thermal properties for energy storage." Thesis, Troyes, 2017. http://www.theses.fr/2017TROY0015/document.
Full textThe objective of this thesis is to study and optimize the manufacturing process of metal foams and the thermal behavior of the aluminum foam/phase change material (PCM) composite by experimental and numerical methods. The manufacturing process of open-cell aluminum foam is developed and optimized to precisely control the parameters of mufacturing. Two pore-scale models of high porosity aluminum foams (HPAF)/PCM composite and low porosity aluminum foams (LPAF)/PCM composite are established for numerical simulation. By simulating the melting process of a layer energy storage system, the HPAF/PCM and LPAFS/PCM composite are compared numerically in order to evaluate the energy storage performance. The results show that aluminum foam improves greatly the heat transfer process in PCM due to its high thermal conductivity. The porosity of aluminum foams could not only influence the melting process of composite but also the energy storage performance. Thanks to the collaboration with EPF, a new manufacturing method of periodic open-cell aluminum foams is developed based on 3D rapid tooling. The thermal behavior of the periodic open-cell aluminum foams/PCM composite is experimentally and numerically analyzed
Klinter, Andreas. "Wetting behaviour of aluminum alloys on ceramic substrates and its effect on the stability of aluminum foams." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:8881/R/?func=dbin-jump-full&object_id=92344.
Full textBernardo, Franco. "Sviluppo di procedimenti di saldatura LASER e LASER arco per pannelli AFS (Aluminum Foam Sandwich)." Doctoral thesis, Universita degli studi di Salerno, 2010. http://hdl.handle.net/10556/207.
Full textLa tesi presenta l’attività di ricerca condotta presso il laboratorio LASER del centro di ricerca ENEA - Trisaia (MT) per lo sviluppo di un procedimento di saldatura, ancora poco diffuso a livello industriale, che è la saldatura ibrida LASER-arco. Inoltre, la novità del lavoro riguarda anche i materiali oggetto di indagine consistenti in estrusi di lega di alluminio, saldati a formare una struttura portante, a cui sono stati collegati pannelli sandwich di schiuma di alluminio (AFS), con una giunzione continua tale da garantire un collegamento strutturale. Considerate alcune problematiche, rilevate dal lavoro di ottimizzazione dei parametri della saldatura LASER-MIG, è stata verificata la possibilità di superare questi problemi (ad esempio la mutua influenza di parametri LASER e di quelli MIG) con l’impiego di un altro tipo di tecnologia LASER-arco basata su generatori a caratteristica cadente di tipo TIG e materiale d’apporto sotto forma di filo freddo. Per questa parte, il lavoro è stato mirato fondamentalmente alla progettazione del nuovo sistema e alla realizzazione di un primo prototipo che ha permesso di evidenziare alcuni importanti risultati. Nella prima parte del lavoro si sono analizzate le prove di saldatura ibrida LASER-MIG tra AFS e profilati di lega di alluminio. Dall’analisi delle prove è emerso che la saldatura ibrida, applicata a materiali altamente riflettenti alla radiazione LASER CO2 come la lega AA6060 T6, permette la saldatura con adeguati fili d’apporto, al contrario della saldatura LASER stand alone. Infatti, questo tipo di lega, di cui sono costituite anche le pelle dei pannelli AFS, riflette fortemente la radiazione LASER CO2 inibendo l’innesco del processo di saldatura keyhole anche con potenze specifiche di 4 x 106 W/cm2. Tale problematica è influenzata molto dall’impostazione dei parametri geometrici LASER-MIG, in particolare il posizionamento relativo delle sorgenti e, più in generale, permette una variabilità molto limitata nell’impostazione dei parametri geometrici, elettrici, delle velocità di saldatura e la quantità di filo d’apporto. Per limitare il problema della mutua interazione fra LASER ed arco, poiché il processo MIG non permette una regolazione della quantità di filo indipendente dalla erogazione della potenza, nella parte finale delle attività si è descritta l’analisi dei componenti necessari, le scelte progettuali, la progettazione di componenti specifici per l’implementazione di una stazione di saldatura ibrida LASER –TIG. Si è realizzato un prototipo con il quale si sono fatti dei test preliminari. Con il prototipo, se pur limitante per quanto riguarda le regolazioni possibili rispetto alle attrezzature definitive progettate, si sono eseguite alcune prove di penetrazione su acciaio inossidabile e leghe di nichel, per le quali erano già noti i benchmark, in termini di velocità massima di processo, alla massima potenza del LASER per ottenere la piena penetrazione, sulla stazione di lavorazione ND:YAG del C.R. ENEA - Trisaia. Da queste prove è emerso chiaramente che la saldatura ibrida, in termini di produttività, è molto più vantaggiosa della saldatura con il solo LASER poiché si sono riscontrati, su tali materiali, aumenti di velocità variabili tra il 60% e il 70% (a parità di potenza LASER). Chiaramente trattandosi di prove esplorative i valori devono intendersi solo indicativi, ma comunque superiori al 20%-30% che normalmente la letteratura riporta come dato. [a cura dell'autore]
VIII n.s.
Hardwicke, Canan Uslu. "Processing and properties of Ti-6A1-4V hollow sphere foams from hydride powder." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/19650.
Full textGrönvall, Sarah. "Jugendornamentik feat. Vectorestetik : Utemöbler för Berga Form AB." Thesis, Linköping University, Carl Malmsten - Centre for Wood Technology & Design, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6998.
Full textDenna rapport presenterar det examensarbete på 10 poäng jag gjorde på möbeldesignprogrammet vid Carl Malmsten CTD våren 2006. Syftet med denna rapport är att beskriva och klargöra processen av detta examensarbete samt formgivningen av produkterna som styrts av mitt koncept. Rapporten grundar sig på dokumentation från processens gång och jag har valt att redovisa mitt arbete i denna rapport i fyra kapitel. Den första inledande delen beskriver bakgrunden till projektet, den andra redovisar insamlingsetappen i form av bild, skissmaterial och konceptbeskrivning, den tredje handlar om skissetappen och själva designprocessen och den sista visar dokumentationen av gestaltningsarbetet av prototyperna. Avslutningsvis kommer en resultatanalys och kommentarer till arbetet och produkterna. Bakgrunden till valet av mitt examensarbete var att jag var nyfiken på hur möbler för utemiljö kan se ut och vilka funktioner de eventuellt kan ha.Jag ville tillföra något som utstrålade något nytt, men som inte förlorat sina kvalitativa egenskaper i fråga om hållbarhet och problemfritt underhåll. Med dessa ideér kontaktade jag Berga Form AB eftersom min uppfattning var att de, liksom jag, värderar kvalité och omsorg för detaljer högt, dessutom har de sin huvudsakliga produktion på Java, Indonesien. Och det var just i denna miljö jag vistades i när jag kontaktade Berga Form första gången. Jag gjorde tre månaders praktik i Singapore/Java höstterminen 2005 när jag fick idén för mitt examensarbete. Resultatet är ett bord och en sittbänk för utemiljö i gjuten aluminium och massiv ask. Produkternas funktion underlättar transport, lagerhållning och vinterförvaring hos kund. Estetiken är exlusiv och stilfull för att passa i Berga Forms nuvarande sortiment. Formspråket som sammanfattar stämmningen för mitt kandidatarbete är; “svart & vitt, prunkande ornamentik, inspirerat av jugend & vectorestetik, samt massivt trä i strama former.”
This report presents the graduation project worth 10 points that I completed in the Furniture Design Program at Carl Malmsten CTD, spring 2006. The purpose of this report is to describe and explain the process of this graduation project and the design of the products that has
shaped the form of my concept.
The report is based on the documentation from the process. I have choosen to present my
work for this report in four chapters. The first and opening chapter describes the background of the project, the second one shows the research, using pictures, and the concept for the
project. The third, is about the design and sketching process, while the last one presents the prototyping. The final part is an analysis of the result and some comments on the work and the
products.
The reason I chose this as my graduation project was beacuse I was curious about outdoor furniture and the possible functions they can have. These types of furniture will not go out of date, as long as the weather permits, as we will always spend time outdoors and will always have a need for products in this environment. I was looking to provide something new in this area, without losing the inherent properties to outdoor furniture.
I presented these ideas for Berga Form AB, because my understanding was that they, just like me, value quality and care for details. Furthermore, they produce the majority of their
products in Java, Indonesia. I was in this area when I contacted Berga Form the first time. I did a 3 months internship in Singapore/Java the autum semester of 2006, when I thought up the idea for my graduation project.
The result if this project is a table and a bench for outdoor environments. The material is cast aluminum and solid Ash tree. This product has a function that will ease transport for Berga Form and winter storage for the customer. The furniture posesses an aesthetic that is exclusive and stylish to match Berga Form´s present collection.
The design concept for this graduation project is;
“black & white, dazzling patterning, inspired by Jugend and Vector aesthetically and solid wood reserved shapes”.
Simpson, Ronald James. "The use of chills as a means of influencing solidification in lost foam cast aluminum alloy A356." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ28662.pdf.
Full textBonaldi, Patrik Oliveira. "Obtenção de espuma de alumínio através do processo de Metalurgia do Pó e propriedades mecânicas de estruturas sanduíche." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/75763.
Full textAluminum foams are materials of porous structure that combine the properties of cell material with those of metallic materials. The metal foam, with porosity above 70%, can be achieved mainly by the "liquid metal route" and by "powder metallurgy". This study aims to contribute to the development of aluminum foam production by powder metallurgy process (PM), unprecedented in Brazil. The objective is to study and define the parameters for producing aluminum foam and sandwich structures by the process of PM, and understand its mechanical behavior. It is proposed also a process optimization, since nowadays the powder compaction phase takes place by the process of extrusion, hot compression or rolling, or even a combination of these. To establish the process parameters, the condition of mixing was studied, as well as the amount of aluminum and blowing agent (TiH2) powder. Were also studied the foaming process conditions by varying the temperature and time. From these results were obtained the sandwich structures, being the focus on steel metal tubes filled with aluminum foam. Subsequently, it was studied the mechanical behavior of the foam and the tubes filled with foam through bending and compression tests. The results of the properties of the foam were compared with the properties predicted by equations proposed by Ashby et. al .. The results showed real possibility to perform only cold axial compression of the metal powder, reaching a density greater than 95% with 450 MPa of compaction pressure. The most adequate mixing of the powders process was carried out in a conventional mixer such as "double V" for 2 hours to give a good homogeneity. The best condition for obtaining foam was with the mixing amount of 1.0% TiH2, with foaming at 710oC for 10 minutes. The mechanical tests showed that the tubes filled with aluminum foam present a considerable increase in the properties.
Proa, Flores Paula Mercedes. "Aluminium foams fabricated by the PM route using nickel- coated titanium hydride powders of controlled particle size." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:8881/R/?func=dbin-jump-full&object_id=92343.
Full textIbrahim, Ahmed Hamed. "Effect of material and processing parameters on the morphology of aluminium foams produced by the PM route." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976253623.
Full textGaytan, Guillen Sara Marisela. "Additive layer manufacturing of TI-6AL-4V by electron beam melting from powder particles solid, mesh and foam components study /." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.
Full textJinnapat, Apichart. "The manufacture and characterisation of aluminium foams made by investment casting using dissolvable spherical sodium chloride bead preforms." Thesis, University of Nottingham, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588085.
Full textAbdulla, Taha. "The effect of pulsed bipolar plasma electrolytic oxidation coatings on the mechanical properties of open cell aluminium foams." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/3806/.
Full textComeau, Christian R. "Critical Erosion/Corrosion Piping Wall Thicknesses Under Static and Fatigue Stress Conditions According to ASME Guidelines." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34057.
Full textMaster of Science
ROCHA, ROSA M. da. "Obtencao e caracterizacao de ceramicas no sistema Si-Al-O-N-C empregando pirolise de misturas de polissiloxano e cargas." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11187.
Full textMade available in DSpace on 2014-10-09T14:01:20Z (GMT). No. of bitstreams: 1 09621.pdf: 29120771 bytes, checksum: 09052cbfc1e575071c4639bed85d4176 (MD5)
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP