Tesis sobre el tema "T353"
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Talbert, Michael Lane. "A methodology for the measurement and evaluation of complex system designs". Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-10022007-145050/.
Texto completoTalbert, B. Allen. "The first year of an agriculture teacher : a case study of three beginning teachers /". Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-05092009-040439/.
Texto completoGenkin, Jean-Marc P. (Jean-Marc Patrick). "Corrosion fatigue crack initiation in 2091-T351 Alclad". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/41792.
Texto completoBooth, Diccon Philip Paul. "Fatigue of friction stir welded AA2024-T351 plate". Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/363704/.
Texto completoBrzostek, Robson Cristiano. "Estudo da fratura em solda ponto por fricção em alumínio Alclad 2024-T351 e alumínio 2024-T351 : uma abordagem numérica experimental". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/72938.
Texto completoFriction Spot Welding (FSpW) is a friction spot weld process, it operates in the solid-state of the material and allows joining two or more sheets in overlap configuration. It is used to join light weight materials, also is suitable to any material that shows good ductility. In this work two different materials are analyzed AA Alclad 2024-T351 e AA 2024-T351, between them the use, or not, of the corrosion protection layer Alclad. The welds are made under the same process parameters previously studied to the material with Alclad. Two parameters are utilized: the first one is the optimum parameter capable to produce welds with good mechanical performance and reproducibility, and another one inadequate because it produces joins with poor mechanical response and reproducibility. It is intended with this work, to evaluate the effects that the Alclad layer can cause in the welds, in its mechanical performance, fracture mode, microstructure and geometry of the join. The results showed a considerable influence of the Alclad, considering that during the process, it migrates from the sheet surface to the center of the weld. Thus, an interface of this material, that has a very low hardness, is created, influencing negatively the performance of the weld and changing the fracture mode. The aim of this dissertation is to perform an analysis of the fracture from the lap shear test, using the finite element method. Therefore, becomes necessary study and develop a numerical model capable to represent the nucleation, coalescence, formation of one or more cracks and, the consequent propagation until the fracture of the body. To perform the analysis it was used the numerical model of fracture called Johnson-Cook (JC), which expresses the equivalent stress as a function of the plastic deformation, the strain rate and the temperature. It was also made a study about the Continuum Damage Mechanics (CDM) theories, and it was necessary to obtain new parameters for the model, that describe the phenomenon and the material. In this sense, it will be performed two analyses, and the first considers the Alclad layer and, the second, considers a weld without defects. It is expected to identify the places where the crack nucleated, and analyze the behavior of the weld, step by step, during the crack propagation, until the complete fracture of the component. And, finally, evaluate the interference in the numerical model of the presence of the protection corrosion layer Alclad.
Rodrigues, Camila Fernanda. "Rebitagem por fricçao de alumínio 2024-T351 em policarbonato". Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/937.
Texto completoUniversidade Federal de Minas Gerais
This dissertation addressed the feasibility study of Friction Riveting technique on polycarbonate and 2024-T351 aluminum alloy spot joints. Design of experiments and Artificial Neural Network modelling were used to investigate the influence of process parameters on mechanical and microstructural properties of joints. These joints were produced at the Institute for Research Helmholtz Zentrum Geesthacht (HZG), in Germany, during the undergraduate years of the applicant. Process temperature was measured using an infrared camera. The mechanical properties of the joints were determined by tensile testing. The macro and microstructural characterization were carried out by light optical microscopy (LOM) and Vickers microhardness tests. The fracture mechanisms were investigated by optical and scanning electron microscopy (SEM). The level of PC degradation in the joining area was obtained by viscometry and Fourier transform infrared spectroscopy (FTIR). The average peak temperatures meausured during joining varied between 52% and 72% of the melting point interval of AA 2024 aluminium alloy. Strong joints with high anchoring efficiency were achieved, with ultimate tensile strength of approximately 90% of metallic rivet, and non-catastrophic ductile fracture at the metallic rivet outside the joined area. This is desirable failure type in riveted polymeric structures and an indication of high-strenght joints. The viscometry and FTIR analysis showed the absence of thermal degradation of the PC in the riveted joint. Statistical and Artificial Neural Networks modeling process showed good repeatability and reproducibility within the conditions studied. These results demonstrated the feasibility of producing spot joints of rivets 2024-T351 and PC by using the FricRiveting process.
Nesta dissertação de mestrado foi realizado um estudo da viabilidade de fabricação de juntas híbridas de Policarbonato (PC) e Alumínio 2024-T351 através do processo de rebitagem por fricção ( Friction Riveting ). Técnicas de planejamento de experimentos aliadas à modelagem por redes neurais foram utilizadas na investigação da influência dos parâmetros de processo, nas propriedades mecânicas e microestruturais das juntas. As juntas foram produzidas no Instituto de Pesquisa Helmholtz Zentrum Geesthacht (HZG), na Alemanha, durante o período de estágio da proponente. A temperatura dos materiais durante o processamento foi medida utilizando-se uma câmera de infravermelho. As propriedades mecânicas das juntas foram determinadas por meio de ensaios de tração. As características macro e microestruturais foram avaliadas por meio de microscopia ótica e ensaios de microdureza Vickers. Os mecanismos de fratura foram investigados por análises em microscópico ótico e de varredura (MEV). O nível de degradação do PC na região da solda foi investigado por viscosimetria e espectroscopia no infravermelho por transformada de Fourier (FTIR). As temperaturas médias atingidas na área friccionada estiveram entre 56% a 72% do intervalo de ponto de fusão da liga AA 2024. Foram produzidas juntas com alta eficiência de ancoramento do rebite metálico, com limites de resistência à tração de aproximadamente 90% da resistência mecânica do rebite, e falha dúctil não catastrófica, ocorrendo no rebite na região externa à placa de PC. As análises de viscosimetria e FTIR demonstraram a ausência de degradação térmica do PC na área de união. A modelagem estatística e via redes neurais do processo demonstraram boa repetitividade e reprodutibilidade dentro das condições estudadas. Tais resultados permitiram demonstrar a viabilidade de produzir juntas de qualidade, com rebites de 2024-T351 e placas de PC, utilizando o processo de Rebitagem por Fricção.
Tabaddor, Mahmood M. "Nonlinear vibration of beam and multibeam systems". Diss., Virginia Tech, 1996. http://hdl.handle.net/10919/40463.
Texto completoTang, Ming. "The effect of an urban growth boundary on property prices : the case of Virginia Beach, Virginia /". Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-12172008-063712/.
Texto completoTarazi, Ghassan John. "National survey of school board members' perceived religious and political leanings and their attitudes on selected education issues". Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-10022007-144639/.
Texto completoYounes, Yousif Younes Abo. "Corrosion control of friction stir welded AA2024-T351 aluminium alloys". Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/corrosion-control-of-friction-stir-welded-aa2024t351-aluminium-alloys(ae2c342d-4cfb-4bbb-a6b4-f62c688b92c6).html.
Texto completoTatarka, Bernadette. "Relationships among body-self relations, exercise involvement, and exercise clothing attitude for women in regular exercise programs". Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-162917/.
Texto completoNeumann, Tomasz. "Friction stir welding of Al 2024-T351 using a self-reacting bobbin tool". Aachen Mainz, 2009. http://d-nb.info/997950617/04.
Texto completoAsquith, David Thomas. "Residual stress and fatigue in cold-worked, hard-coated 2024-T351 aluminium alloy". Thesis, University of Sheffield, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486777.
Texto completoMann, Philip. "Evaluation of surface modifications introduced by shot peening of aluminum alloy 2024-T351". Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123117.
Texto completoLe grenaillage est un procédé de déformation mécanique consistant à bombarder une surface métallique ductile avec de petits billes sphériques à des vitesses élevées (10 à 100 m/s). Lors de l'impact, les billes génèrent l'apparition d'une zone déformée en surface, caractérisée par un durcissement relativement important ainsi qu'un champ de contraintes résiduelles de compression, ce qui entraîne une meilleure résistance à la fatigue. Cependant, l'effet de la vitesse d'impact de la bille et de la couverture de surface sur la modification des propriétés de surface induit par le grenaillage ne sont pas bien compris.Dans cette étude, la dureté et les contraintes résiduelles ont été étudiées en utilisant des expériences de nanoindentation pour les situations suivantes: trois vitesses de billes différentes correspondant à 35 m/s, 54 m/s et 66 m/s, ainsi que deux couvertures de surface correspondant à un seul impact et à une couverture complète (100%). Pour la situation (i) de l'étude d'un unique impact, une nouvelle procédure de polissage a été développée permettant de localiser un impact isolé. Cette procédure permet de préparer la surface de telle sorte que la nanoindentation peut être effectuée sur la section transversale de l'impact et permet de vérifier que l'impact a été produit par une bille frappant la surface avec une incidence normale. Il a été observé que la dureté et les contraintes résiduelles de compression augmentent avec une augmentation de la vitesse de la bille. Les résultats expérimentaux de contraintes résiduelles ont été comparés à ceux d'une simulation numérique en utilisant les mêmes paramètres expérimentaux de grenaillages. Il a été observé que les résultats expérimentaux montrent un comportement similaire et sont du même ordre de grandeur que ceux obtenus par simulation numérique. La principale différence est que les résultats expérimentaux ont montré une contrainte résiduelle de compression maximale étant indépendante de la vitesse de la bille.Pour la situation (ii) d'une couverture complète et à l'aide du procédé de microscopie électronique à balayage, nous avons observé un raffinement des grains adjacents à la surface grenaillée. En outre, nous avons observé que la dureté et les contraintes résiduelles de compression augmentaient avec une augmentation de la vitesse de la bille. De même que pour l'impact isolé, la localisation des contraintes résiduelles de compression maximale était indépendante de la vitesse de la bille.
Seidt, Jeremy Daniel. "Plastic Deformation and Ductile Fracture of 2024-T351 Aluminum under Various Loading Conditions". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1268148067.
Texto completoAburas, Zakria Moh. "Microstructural characterisation and corrosion studies of excimer laser-treated aluminium alloy AA2024-T351". Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/microstructural-characterisation-and-corrosion-studies-of-excimer-lasertreated-aluminium-alloy-aa2024t351(d517d02a-ca18-4b08-8131-699a4426fd92).html.
Texto completoTaylor, Karen. "William Thomas Sutherlin, patriarch of Danville". Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/88585.
Texto completoMaster of Arts
Pilli, Srinivas. "Effects of ultrasonic impact treatment on fatigue life of pre-exfoliated AA-2024-T351". Thesis, Sheffield Hallam University, 2008. http://shura.shu.ac.uk/20229/.
Texto completoTavakkoli, Shahriar. "Shape design using intrinsic geometry". Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/39421.
Texto completoTaylor, Helen Wilson. "An investigation of factors associated with the implementation of mandatory staff development training". Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54439.
Texto completoEd. D.
Busquim, Thaís de Paula. "Avaliação da resistência à corrosão da liga 2024-T351 soldada por FSW Friction Stir Welding". Universidade Federal de São Carlos, 2007. https://repositorio.ufscar.br/handle/ufscar/764.
Texto completoUniversidade Federal de Sao Carlos
The corrosion resistance of aluminum alloy can be impaired due to intermetallic precipitation during thermal treatment to improve mechanical properties. This work investigates the corrosion resistance of aluminum alloy 2024-T351 and the joint welded by FSW. Microstructural analysis and microhardness tests were made. Intergranular corrosion tests according to ASTM G110-97, exfoliation corrosion tests according to ASTM G 34-01 and stress corrosion cracking in 3.5% NaCl according to ASTM G 129-00, were carried out. Anodic behavior was evaluated by potentiodynamic polarization measurements in 3.5% NaCl solution. It was not detected intermetallic precipitates by electron and optical microscopy. It was also detected that the joint was more severe attacked than the base metal by intergranular corrosion and exfoliation tests. The welded joint was susceptible to stress corrosion cracking in tests carried out with low nominal strain rate of 10-7 s-1. Base metal and the joint in tests carried out in air and in 3.5% NaCl at strain rate of 10-6 s-1 showed ductile behavior, while the joint with strain rate of 10-7 s-1 showed fragile behavior. The polarization test in chloride medium of aluminum alloys didn t show passive breakdown what make difficult to determinate the pitting potential. Polarization curves indicated that the welded joint had lower current density and higher potential than the base metal. In lower potentials pitting was formed majoritary at grain boundaries
A resistência à corrosão de ligas de alumínio pode ser degradada devido à precipitação de intermetálicos quando submetidas a tratamentos térmicos para elevar a resistência mecânica. Este trabalho investiga a resistência à corrosão da liga de alumínio 2024-T351 e também da junta soldada por FSW. Foram feitos análise microestrutural e microdureza. Foram realizados ensaios de corrosão intergranular segundo a norma ASTM G110-97, corrosão por esfoliação de acordo com a norma ASTM G34-01 e também ensaio de corrosão sob tensão em solução de NaCl 3,5% com taxa de deformação de 10- 6 e 10-7 s-1, segundo a norma ASTM G129-00. O comportamento anódico foi avaliado por testes potenciodinâmicos em solução de NaCl 3,5%. Os precipitados intermetálicos não foram observados por microscopias ótica e eletrônica. Nos ensaios de corrosão intergranular e esfoliação foi observado que a junta soldada sofreu corrosão mais acentuada do que o metal base. A junta soldada foi suscetível a corrosão sob tensão, somente em ensaios realizados com taxa de deformação baixa, de 10-7 s-1. O metal base e a junta ensaiada ao ar e em NaCl 3,5% com taxa de deformação de 10-6 s-1 apresentaram comportamento dútil, enquanto a junta com taxa de deformação 10-7 s-1, apresentou comportamento frágil. Nos ensaios de polarização em meio de cloretos a liga 2024-T351 não foi observado patamar de passivação o que dificultou a determinação do potencial de pite. As curvas de polarização mostraram que a junta soldada possui densidade de corrente menor e maiores potenciais do que o metal base. Em baixos potenciais os pites foram formados preferencialmente nos contornos dos grãos
Taraban, Ronald H. "Isolation and characterization of carbofuran and dicamba degrading bacteria". Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40115.
Texto completoTate, Andrew E. "Maturation, spawning and fertility of hybrid striped bass (Morone chrysops x Morone saxatilis) exposed to 6- and 9-month photothermal cycles". Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-02132009-170956/.
Texto completoLarignon, Céline. "Mécanismes d'endommagement par corrosion et vieillissement microstructural d'éléments de structure d'aéronef en alliage d'aluminium 2024-T351". Phd thesis, Toulouse, INPT, 2011. http://oatao.univ-toulouse.fr/6994/1/larignon_partie_1_sur_2.pdf.
Texto completoCurtis, Sean Allan. "The effects of shot peening on corrosion fatigue of aluminium alloy 2024 T351 and 7150 T651". Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289664.
Texto completoAdiwijayanto, Florentinus. "Etude comparative des mécanismes de fissuration par fatigue des alliages d'aluminium 8090C T851 et 2024 T351". Poitiers, 1994. http://www.theses.fr/1994POIT2284.
Texto completoTang, Yun-chung. "Motor simulation and parameter identification in a reciprocating mechanism". Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10312009-020104/.
Texto completoTaylor, Lynn Elizabeth. "The effects of added fat on acid-base status in exercising horses". Thesis, Virginia Tech, 1991. http://hdl.handle.net/10919/45305.
Texto completoMaster of Science
Beal, Roger Zack. "A study comparing changes in loading conditions of an extended service life system using aluminum 2024-T351". Thesis, The University of Utah, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1569706.
Texto completoThe current fiscally austere environment prevalent in the military and industry is driving extreme measures to save money. In the United States Air Force, this has driven enormous efforts to trim sustainment spending on extended life aircraft. The challenge to the aerospace engineer is to ensure flight safety in the midst of this economic pressure.
One method of cutting costs is to increase the time an aircraft is in service by delaying the point when the aircraft is taken out of service for depot maintenance. To ensure flight safety, in depth fatigue and fracture analysis needs to be accomplished to assess increasing the inspection interval.
The purpose of this study was to determine the sensitivity of Aluminum 2024-T351 alloy, a common material used in tension dominated aerospace applications, to two different loading spectra—one that is aggressive and the other that is benign. This was accomplished by conducting five different combinations of the two spectra, developing computer simulations using the AFGROW software and comparing with the measured data. The results showed that the material demonstrated significantly different behavior between the two spectra. These results provide a valuable tool for the aerospace engineer for fatigue life prediction and inspection interval evaluation.
Billy, Fabien. "Vieillissement et propriétés résiduelles de matériaux issus du démantèlement d'avions en fin de vie". Phd thesis, ISAE-ENSMA Ecole Nationale Supérieure de Mécanique et d'Aérotechique - Poitiers, 2013. http://tel.archives-ouvertes.fr/tel-00824151.
Texto completoPauze, Nathalie. "Fatigue corrosion dans le sens travers court de tôles d'aluminium 2024-T351 présentant des défauts de corrosion localisée". Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2008. http://tel.archives-ouvertes.fr/tel-00359611.
Texto completoNous avons caractérisé la sensibilité de l'alliage 2024-T351 à la corrosion intergranulaire. Il se forme en 7h d'immersion dans NaCl 0.5 M un défaut semi-elliptique de 200 µm de profondeur. Puis la corrosion intergranulaire ralentit fortement.
Nous avons étudié les mécanismes de propagation en fatigue à partir de ces défauts, en particulier la transition entre la corrosion intergranulaire et les fissures transgranulaires courtes de fatigue. A chaque étape de l'endommagement, une estimation des cinétiques, du Delta-K et la morphologie des défauts sont données. Deux mécanismes ont été distingués : un mécanisme de corrosion sous contrainte (cyclique) intergranulaire et un mécanisme de fatigue corrosion transgranulaire. Un critère de transition est proposé
Tadepalli, Raghuram. "An empirical investigation of the relationship between purchasing professionals' perceptions of role stress and selected antecedent and consequent variables". Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/74218.
Texto completoPh. D.
Tackett, Jared Franklin. "Directing Movement and the Perception of Space". Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/33437.
Texto completoMaster of Architecture
Lacombe, Alexandra. "Influence du procédé de perçage sur l'intégrité de surface et la tenue en fatigue de pièces percées en AA2024-T351". Thesis, Toulouse 3, 2021. http://www.theses.fr/2021TOU30001.
Texto completoIn aircraft structures, drilled holes are major critical areas from where fatigue damage can be initiated. Depending on the drilling parameters and process, manufacturers observe significant different fatigue strength of the drilled structures. This thesis aims to give elements for understanding this industrial problem, for the case of AA2024-T351 drilled parts. It deals with industrial drilling configurations and focus on two drilling processes: orbital drilling which offers many potential economic advantages and axial drilling which is the conventional drilling process. The objective of the study is to assess the impact of the drilling configuration on the fatigue strength of the drilled part, but also on surface integrity of the drilled hole. This has to enable to identify the surface integrity parameters controlling the fatigue strength and the major drilling process parameters driving the surface integrity. The first step of the work was to conduct fatigue tests to assess the fatigue performance of different drilling configurations. These revealed significant differences in fatigue life between some drilling configurations. The second step was to lead an experimental characterization of the surface integrity of the drilled holes. This was orientated by a finite element model predicting the material depth affected in the hole subsurface and new analysis methods (like the "HOCT") had to be considered for some aspects of the surface integrity due to the small depth affected. This campaign showed the dominating influence of the internal aspects of the surface integrity (strain hardening and residual stress) on the fatigue strength. Finally, the last step of the work aimed to study the impact of the drilling process parameters on the surface integrity. For this purpose, a finite element model of orthogonal cutting has been developed. The dominating influence of the tool geometry on the surface integrity has been shown
Prieto, Yespica Wolfgang José. "Etude comparative du comportement électrochimique des alliages d'aluminium 2024 T351 et 7075 T7351 en milieu neutre de sulfate de sodium". Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0054/document.
Texto completoThis work concerns the study of behavior the corrosion of two aluminum alloy: the alloy 2024 (AA 2024 T351) and 7075 (AA7075 T7351) and pure aluminum, used as reference, in a solution of 0.1 M Na2SO4 using electrochemical measurements (polarization curves, curves Levich and impedance spectroscopy) with rotating disk electrodes. Compared to published studies, quantitative data on the anodic and cathodic processes occurring on the two alloys were obtained. The first part of the thesis is devoted to the microstructural characterization of two alloys: size, chemical composition of precipitates and surface fraction occupied by the different phases. The second part presents the results of impedance obtained at the corrosion potential for different immersion times and different speeds. At this potential, the behavior of materials is mainly controlled by the passive film. The impedance diagrams exhibit a frequency dispersion, expressed in terms of "constant stage element (CPE)." This behavior was analyzed using a physical model which allows to show a distribution of resistivity in the thickness of oxide films. In the last part, special attention was paid to the analysis of the cathodic reaction on the surface of the two alloys that is causing their degradation. The oxygen reduction occurs mainly on the intermetallic particles. Surprisingly, the cathode current density is significantly lower for the alloy 7075 which has a greater surface area covered by the particles. It was shown that for 2024 alloy, the cathodic reaction is controlled by material transport by convective diffusion of small electrodes, while for the alloy AA 7075, most of the particles, very small, behaves as microelectrodes for which the current is set by the spherical diffusion, independent of the convection
Tang, Stanley C. "Robot positioning error analysis and correction". Thesis, This resource online, 1987. http://scholar.lib.vt.edu/theses/available/etd-04122010-083623/.
Texto completoThéberge, Francis. "Third-order parametric processes during the filamentation of ultrashort laser pulses in gases". Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24401/24401.pdf.
Texto completoTan, Jeffrey Meng-Lee. "Residual stress and fatigue crack growth life prediction in fastener holes cold-worked by uniform indentation in 2024-T351 aluminium alloy". Thesis, Open University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500610.
Texto completoPriest, Maria. "The experimental characterisation of residual stresses and fatigue crack growth in the vicinity of cold worked holes in Al 2024-T351". Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387962.
Texto completoTaiyabi, Asif A. "A multi-attribute analysis of nuclear waste disposal alternatives". Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-02022010-020127/.
Texto completoTerrado, Ramon. "Diversité et succession des protistes dans l'océan Arctique". Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/27849/27849.pdf.
Texto completoTerradas, Miguel M. "La fonction réflexive chez les mères d'enfants victimes d'abus sexuel : développement d'une échelle mesurant le fonctionnement réflexif de la mère dans un contexte d'interaction mère-enfant". Doctoral thesis, Université Laval, 2007. http://hdl.handle.net/20.500.11794/19339.
Texto completoTang, Ruey-Er. "Computer utilization in interior design: designer attitudes, function application, and equipment usage". Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/45658.
Texto completoThis research investigated the extent of computer usage in the interior design profession including attitudes toward computers, computer applications, and computer equipment usage. A questionnaire was sent to five hundred professional members of the American Society of Interior Designers across the nation.
The frequency distribution was used on 169 usable data to describe the sample background characteristics and to determine the computer equipment utilization. Means and TV test were employed to examine if a significant difference of opinion toward computers existed between designers based on experience on computers, size of organizations, and type of projects.
Findings which were statistically significant indicated that computer-experienced and non-residential interior designers had more positive attitudes toward computers. More computers had been incorporated into non-residential interior designersâ offices. Overall, interior designers from various backgrounds had the same opinion in believing that computers were not cost-effective for drafting application for most interior designers or for their own establishments at present. The most popular computer applications in this study were billing, accounting, financial management, specification, and business correspondence. Furthermore, the IBM personal computer was found to be the most used microcomputer in this study.
Master of Science
Atlati, Samir. "Développement d'une nouvelle approche hybride pour la modélisation des échanges thermiques à l'interface outil-copeau : application à l'usinage de l'alliage d'aluminium aéronautique AA2024-T351". Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0200/document.
Texto completoThis PhD. thesis is realised in the framework of an international cooperation between the University of Lorraine (France) and the University of Oujda (Morocco). The work done concerns the modelling of machining process by material removal. Two important aspects of machining have been investigated: the chip formation process and the heat exchange at the tool-chip interface. In the first part of the thesis, a FE modelling of the cutting process has been established. Chips segmentation have been particularly analysed using à new parameter (Segmentation Intensity Ratio) allowing the quantification of the phenomenon. A correlation has been established between the cutting force reduction and the chip segmentation intensity. The second part of the thesis has been devoted to the study of heat exchange at the tool-chip interface, among other phenomena that contribute to the tool wear. One important point of the study is the establishment of a hybrid identification procedure (analytical/numerical) to estimate the heat flux transmitted into the cutting tool, and identification of the heat partition coefficient at the contact interface for each cutting speed. With identified values of the heat partition coefficient obtained by varying the cutting speed, a heat exchange multi-branch law has been proposed and parameters of this law have been identified. This law corresponds firstly to the evolution of the heat partition coefficient as a function of the cutting speed. Thereafter, it was defined in term of the relative sliding velocity at the tool-chip contact interface, in order to implement it in a FE code. The user interface VUINTER of Abaqus/Explicit has been used to implement the proposed law, to fully control the mechanical and thermal contact. It is henceforth possible to implement with this user interface any thermomechanical contact (friction, heat partition coefficient, etc.). The implementation via the user subroutine VUINTER was validated first on adequate tests, then on machining. The obtained results for heat fluxes with this new procedure are in good agreement with experimental measurements for the tool-workmaterial couple considered: AA2024-T351/WC-Co
Smith, Jarrod L. "Full-Field Measurement of the Taylor-Quinney Coefficient in Tension Tests of Ti-6Al-4V, Aluminum 2024-T351, and Inconel 718 at Various Strain Rates". The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1546452653747728.
Texto completoList, Gautier. "Etude des mécanismes d'endommagement des outils carbure WC-Co par la caractérisation de l'interface Outil-Copeau: application à l'usinage à sec de l'alliage d'aluminium aéronautique AA2024 T351". Phd thesis, Paris, ENSAM, 2004. http://pastel.archives-ouvertes.fr/pastel-00001178.
Texto completoTang, Guanghua. "High temperature thin film superconductors and microstrip spiral delay lines". Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-01242009-063221/.
Texto completoThadal, Philippe. "Impact des interactions sociales sur les transferts des migrants : cas du district thaïlandais de Nang Rong". Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26219/26219.pdf.
Texto completoJudas, Jakub. "Extrémně nízkocyklová únavová životnost slitin neželezných kovů". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400859.
Texto completoTaylor, Beatrice Dietering. "A study of high school biology students engaged in a Science-Technology-Society (STS) landfill restoration project". Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/37429.
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