Made available in DSpace on 2016-06-02T20:27:38Z (GMT). No. of bitstreams: 1 3160.pdf: 1167165 bytes, checksum: d968da16f55a4ed2bbefe667a52d3d80 (MD5) Previous issue date: 2010-08-17 / Financiadora de Estudos e Projetos / In this work, we studied the construction of weak solutions for some systems conservation laws and for a scalar conservation laws For the p-systems relativistic we use the Wave-front tracking based on Bressan, when the total variation of the initial data is locally bounded. We construct is somewhat more simpler than in methods studied by other authors. For the equation of Aw-Rascle we apply the method of Glimm and the method Wave-front tracking, we consider the appearence of the vacuum, when the total variation of the initial data is locally bounded. For the scalar conservation law we study the construction of admissible weak solutions using the Glimm method and the poligonal approximations. / Neste trabalho, estudamos a construção de soluções fracas para alguns sistemas de leis de conservação e para uma lei de conservação escalar. Para o p-sistema relativístico aplicamos o método Wave-front tracking baseado em Bressan, quando a variação total do dado inicial é localmente limitada. O nosso método de construção é um pouco mais simples que os métodos estudados por outros autores. Para as equações de Aw-Rascle aplicamos o método de Glimm e o método Wave-front tracking permitindo ou não o aparecimento de vácuo nas soluções aproximadas, quando a variação total do dado inicial é localmente limitada. Para a lei de conservação escalar estudamos a construção de soluções fracas admissíveis utilizando o método de Glimm e a aproximação poligonal.

The diploma thesis deals with possibilities for processing aluminium alloy EN AW 2618 using Selective laser melting (SLM). The theoretical part contains basic knowledge about production by this technology and possibilities of evaluation of relative density of samples. It also contains an overview of the current state of knowledge about the processing of aluminium alloys by SLM technology. Above all, aluminium alloys of the series 2000, where the main alloying element is copper. In the experimental part testing samples were designed based on the research. These samples can be divided into three areas: single-track specimens, volume samples and samples for tensile testing. Single-track and volume samples were used to find appropriate processing parameters to achieve a relative density close to full volume of material. For this purpose, the effect of the different scanning strategies on the relative density of the sample were examined. The limiting factor has been the occurrence of small cracks in the broad range of parameters studied. Mechanical properties of samples produced by SLM were compared with extruded material. It was found that the material processed by SLM achieves only half the yield strength and tensile strength of extruded material. This is mainly due to the occurrence of small cracks and other defects in the structure of the material.

The final thesis determined the properties of alloys formed from mixtures of powders processed by the SLM method. Powders of alloy AlSi12 and EN AW 2618 were fused in the proportion 75 wt. % AlSi12 + 25 wt. % 2618, 50 wt. % AlSi12 + 50 wt. % 2618 and 25 wt. % AlSi12 + 75 wt. % 2618. Metallographic analysis, EBSD analysis and line EDS microanalysis were made on the samples. Tensile test at room temperature and hardness were carried out to determine the mechanical properties. Fractographic analysis was performed after tensile test.

This project is a feasibility study for Hydro Extrusion Sweden AB, a company that produces extruded aluminium profiles. The main purpose of this project was to analyse the difference of Mg2Si particle sizes in aluminium alloys when varying parameters, such as cooling rate and composition, in aluminium extrusion, particularly the EN AW 6082 alloy. The Mg2Si particles have a great impact on the product’s mechanical properties. This was done in order to investigate whether real-time process parameter control is possible or not. The main software used was Thermo-Calc and the add-on module DICTRA. Thermo-Calc was used to do equilibrium calculations and gather data for the alloy and its phases. Based on this information and data from Hydro, simulations in DICTRA could be performed. The results were then plotted with respect to time and radius. The findings indicate that the cooling rate significantly influences the particle size. As the process becomes more intricate and involves a greater number of trace elements, adjusting the cooling rate could potentially be employed as a means to address this issue. The results also showed that trace elements had a minimal effect on the particle size. However, this probably does not match the reality since other phases affect and block the growth of Mg2Si.The overall results indicate a positive outcome for using DICTRA in determining particle sizes. However, further research needs to be done in correlation with more experiments before this could be a viable research method for Hydro. / Det här projektet är en förstudie för företaget Hydro Extrusion Sweden AB som producerar extruderade aluminiumprofiler. Det huvudsakliga syftet med projektet var att analysera skillnaden på Mg2Si-partiklarnas storlek i aluminiumlegeringar när olika parametrar som kylhastighet och sammansättning användes vid aluminiumextrudering, mer specifikt legeringen EN AW 6082. Mg2Si partiklarna har stor betydelse för produktens mekaniska egenskaper. Syftet med detta var att undersöka huruvida det är möjligt att styra process parametrarna i realtid. Mjukvaran som användes var Thermo-Calc och tilläggsmodulen DICTRA. Thermo-Calc användes för att göra jämviktsberäkningar och samla in data för legeringen samt dess faser. Baserat på denna information och data från Hydro kunde simuleringar i DICTRA utföras. Resultaten plottades sedan med avseende på tid och radie. Partikelstorleken påverkas avsevärt av kylningshastigheten enligt resultaten. I framtiden, när processen blir mer avancerad med fler spårämnen, kan det vara möjligt att justera kylningshastigheten för att hantera detta. Resultaten visade också att spårämnen hade en mycket liten effekt på partikelstorleken. Detta stämmer dock förmodligen inte med verkligheten eftersom andra faser påverkar och blockerar tillväxten av Mg2Si. De övergripande resultaten pekar på ett positivt resultat för att använda DICTRA för att bestämma partikelstorlekar. Ytterligare forskning måste göras i samband med fler experiment innan detta kan vara en genomförbar forskningsmetod för Hydro.

Design problems involve finding optimal plans that minimize cost and maximize information about the effects of changing experimental variables on some response. Information is typically measured through statistically meaningful functions, or criteria, of a design's corresponding information matrix. The most common criteria implicitly assume equal interest in all effects and certain forms of information matrices tend to optimize them. However, these criteria can be poor assessments of a design when there is unequal interest in the experimental effects. Morgan and Wang (2010) addressed this potential pitfall by developing a concise weighting system based on quadratic forms of a diagonal matrix W that allows a researcher to specify relative importance of information for any effects. They were then able to generate a broad class of weighted optimality criteria that evaluate a design's ability to maximize the weighted information, ultimately targeting those designs that efficiently estimate effects assigned larger weight. This dissertation considers a much broader class of potential weighting systems, and hence weighted criteria, by allowing W to be any symmetric, positive definite matrix. Assuming the response and experimental effects may be expressed as a general linear model, we provide a survey of the standard approach to optimal designs based on real-valued, convex functions of information matrices. Motivated by this approach, we introduce fundamental definitions and preliminary results underlying the theory of general weighted optimality. A class of weight matrices is established that allows an experimenter to directly assign weights to a set of estimable functions and we show how optimality of transformed models may be placed under a weighted optimality context. Straightforward modifications to SAS PROC OPTEX are shown to provide an algorithmic search procedure for weighted optimal designs, including A-optimal incomplete block designs. Finally, a general theory is given for design optimization when only a subset of all estimable functions is assumed to be in the model. We use this to develop a weighted criterion to search for A-optimal completely randomized designs for baseline factorial effects assuming all high-order interactions are negligible. / Ph. D.

Cette thèse concerne la modélisation par des EDP et la résolution numérique de problèmes d'optimisation pour les flux d'information et pour le trafic routier. Nous proposons un nouveau type de schémas hybrides. En premier, nous nous intéressons à l'optimisation des temps de service nécessaires à un serveur informatique pour traiter un ou plusieurs types de requêtes, afin de satisfaire une qualité de service imposée. La modélisation choisie fait intervenir un système de lois de conservation proposé par De Vuyst. Les particules sont les requêtes et la variable d'espace représente le taux d'avancement dans le traitement de la requête. Nous exhibons alors les équations différentielles ordinaires permettant de calculer les temps de service. Cela nous permet d'optimiser l'allocation des ressources du serveur suivant le type de requêtes. Nous présentons deux exemples de simulation numérique. Ensuite, nous considérons un problème d'optimisation en trafic routier faisant intervenir le modèle "fluide" aux EDP du second ordre de Aw-Rascle. Les particules sont les véhicules. A partir de données observées, en quantité limitée, sur une portion de route [0;L] et sur un intervalle de temps [0;T], nous voulons prévoir les conditions de circulation après le temps T. Il faut connaître précisément les conditions aux temps T pour les utiliser dans le système de Aw-Rascle comme nouvelles conditions initiales. Nous calculons cette condition initiale en retrouvant par un algorithme d'optimisation la solution de Aw-Rascle qui minimise l'erreur entre les valeurs de cette solution et les données observées. Il s'agit d'un problème d'assimilation de données, que nous résolvons par une méthode adjointe. Deux stratégies distinctes sont possibles : nous prenons comme variables d'optimisation les conditions initiales et les conditions aux bords du domaine [0;L]x [0;T] ou alors nous prenons uniquement comme variables d'optimisation les conditions initiales sur une section plus grande [-L';L]. Nous explorons ces deux stratégies. Enfin, nous nous intéressons aux schémas numériques permettant de trouver les solutions des systèmes de lois de conservation tels que les deux systèmes précédents. Nous présentons alors un nouveau type de schémas hybrides à un paramètre qui permet d'obtenir la propriété TVD et d'être du second ordre en espace et en temps. Le paramètre permet d'interpoler les schémas de Lax-Wendroff et de Lax-Friedrichs. Après cette première phase prédictrice, il est possible de corriger ce paramètre dans les cellules où il y a production d'entropie numérique. Nous obtenons ainsi un schéma qui permet de capturer la solution physique.

This thesis addresses authenticity and integrity of medical images using watermarking. Hospital Information Systems (HIS), Radiology Information Systems (RIS) and Picture Archiving and Communication Systems (P ACS) now form the information infrastructure for today's healthcare as these provide new ways to store, access and distribute medical data that also involve some security risk. Watermarking can be seen as an additional tool for security measures. As the medical tradition is very strict with the quality of biomedical images, the watermarking method must be reversible or if not, region of Interest (ROI) needs to be defined and left intact. Watermarking should also serve as an integrity control and should be able to authenticate the medical image. Three watermarking techniques were proposed. First, Strict Authentication Watermarking (SAW) embeds the digital signature of the image in the ROI and the image can be reverted back to its original value bit by bit if required. Second, Strict Authentication Watermarking with JPEG Compression (SAW-JPEG) uses the same principal as SAW, but is able to survive some degree of JPEG compression. Third, Authentication Watermarking with Tamper Detection and Recovery (AW-TDR) is able to localise tampering, whilst simultaneously reconstructing the original image.

Das Ziel dieser Arbeit besteht in der Erforschung des Zusammenhangs zwischen der Struktur der Metalloberfläche und der Verbundfestigkeit von thermisch gefügten Thermoplast-Metall-Verbunden. Dazu wird für die Haftungsmechanismen Stoff-, Kraft- und Formschluss an einem Minimalbeispiel rechnerisch gezeigt, dass verschiedene Oberflächenmerkmale (wahre Oberfläche, Strukturdichte, Aspektverhältnis, Hinterschnitte, Substrukturen) mit der Verbundfestigkeit in Verbindung stehen. Basierend darauf werden Oberflächenkenngrößen (standardisierte Rauheitsparameter, fraktale Dimension) gewählt, die die haftungsfördernden Strukturmerkmale möglichst umfassend einbeziehen. Daraus werden Hypothesen abgeleitet, die die Prognostizierbarkeit der Verbundfestigkeit aus Oberflächenkenngrößen für Thermoplast-Metall-Verbunde postulieren. Die experimentelle Überprüfung erfolgt an Aluminium im Verbund mit Polyamid 6 bzw. Polypropylen in Rohrtorsions-, Rohrzug- sowie Zugscherversuchen. Die Einstellung der Oberflächenstruktur des Aluminiums erfolgt durch mechanisches Strahlen, alkalisches Ätzen, thermisches Spritzen sowie Laserstrukturieren. Die Erfassung der Oberflächenstruktur erfolgt taktil sowie aus Querschliffaufnahmen. Die Höhe der Verbundfestigkeit kann anhand der Oberflächenstruktur erklärt und teilweise mit hoher Korrelation quantitativ in Verbindung gebracht werden. Bei taktiler Messung verhindert jedoch eine unzureichende Erfassung bestimmter Strukturmerkmale eine exakte Abbildung der tatsächlichen Oberflächenstruktur. Bei der Erfassung der Oberflächenstruktur aus Querschliffaufnahmen stellt die erreichbare Bildauflösung und -qualität einen limitierenden Faktor dar. Ebenso können aus der Oberflächenstruktur keine individuellen, strukturspezifischen Versagensmechanismen abgeleitet werden.:Inhaltsverzeichnis 5 Abbildungsverzeichnis 9 Tabellenverzeichnis 14 Abkürzungsverzeichnis 16 Symbolverzeichnis 17 1 Motivation 20 2 Stand der Wissenschaft und Technik 22 2.1 Verwendete Begriffe 22 2.2 Verbundwerkstoffe und Werkstoffverbunde 22 2.2.1 Faser-Kunststoff-Verbunde 24 2.2.2 Polymer-Metall-Verbunde 25 2.3 Fügen von Polymer-Metall-Verbunden 27 2.3.1 In-Mold Assembly 28 2.3.2 Kleben 28 2.3.3 Montage 29 2.3.4 Thermisches Fügen 31 2.4 Prüfung der Verbundfestigkeit 34 2.4.1 Prüfkörpergeometrien 34 2.4.2 Beständigkeit gegen Umwelteinflüsse 36 2.5 Verfahren zur Vorbehandlung der Metalloberfläche 38 2.5.1 Mechanisches Strahlen 39 2.5.2 Laserstrukturieren 40 2.5.3 Chemische und elektrochemische Verfahren 43 2.5.4 Beschichten 43 2.5.5 Weitere Verfahren 44 3 Zusammenhang zwischen Oberflächenstruktur und Verbundfestigkeit 46 3.1 Haftungsmechanismen 47 3.1.1 Stoffschluss 48 3.1.2 Kraftschluss 50 3.1.3 Formschluss 51 3.1.4 Skalenabhängigkeit 53 3.1.5 Eigenspannungen 54 3.1.6 Folgerungen 54 3.2 Charakterisierung der Oberflächenstruktur und Korrelation mit der Verbundfestigkeit 55 3.2.1 Standardisierte Rauheitsparameter 56 3.2.2 Fraktale Dimension 58 3.2.3 Anwendungsbeispiel 59 4 Zielstellung 62 4.1 Folgerungen aus dem Stand der Wissenschaft und Technik 62 4.2 Forschungshypothesen 63 5 Experimentelle Vorgehensweise 64 5.1 Charakterisierung der Ausgangswerkstoffe 64 5.2 Vorbehandlung der Metalloberflächen 67 5.2.1 Mechanisches Strahlen und alkalisches Ätzen 67 5.2.2 Thermisches Spritzen 68 5.2.3 Laserstrukturieren 68 5.3 Charakterisierung der Oberflächenstruktur 69 5.4 Mechanische Verbundprüfung 71 5.5 Verwendeter Fügeprozess 73 5.6 Statistische Betrachtung 75 6 Ergebnisse und Diskussion 77 6.1 Verbundfestigkeit in Abhängigkeit von der Oberflächenvorbehandlung 77 6.1.1 Rohrproben 77 6.1.1.1 Oberflächencharakteristika und Benetzung 77 6.1.1.2 Verbundfestigkeit und Korrelation mit Oberflächenkennwerten 81 6.1.1.3 Bruchflächenanalyse 85 6.1.2 Zugscherproben 90 6.1.2.1 Oberflächencharakteristika und Benetzung 90 6.1.2.2 Verbundfestigkeit und Korrelation mit den Oberflächenkennwerten 91 6.1.2.3 Bruchflächenanalyse 93 6.1.3 Ergebnisdiskussion 95 6.2 Verbundfestigkeit in Abhängigkeit von der Skalierung 97 6.2.1 Oberflächencharakteristika und Benetzung 97 6.2.2 Verbundfestigkeit und Korrelation mit Oberflächenkennwerten 102 6.2.3 Bruchflächenanalyse 102 6.2.4 Ergebnissdiskussion 106 7 Zusammenfassung und Folgerungen 108 8 Ausblick 112 Literaturverzeichnis 115 Anhang 129 / The aim of this work is to investigate the relationship between the structure of the metal surface and the compound strength of thermally joined thermoplastic-metal compounds. For this purpose, equations are derived for the adhesion mechanisms of material, force and form closure using a minimal example, which link various surface characteristics (true surface, structure density, aspect ratio, undercuts, substructures) with the compound strength. Based on this, surface parameters (standardized roughness parameters, fractal dimension) are chosen that incorporate the adhesion-promoting structural features as comprehensively as possible. From this, hypotheses are derived that postulate the predictability of compound strength from surface parameters for thermoplastic-metal composites. Experimental verification is carried out on aluminum in compounds with polyamide 6 or polypropylene in hollow cylinder torsion tests, hollow cylinder tensile tests as well as tensile shear tests. The surface of the aluminum is structured by mechanical blasting, alkaline etching, thermal spraying and laser structuring. The surface structure is recorded tactilely and from transverse micrographs. The height of the compound strength can be explained on the basis of surface structure and, in part, quantitatively related with high correlation. However, in the case of tactile measurement, nondetection of certain structural features prevents accurate mapping of the actual surface structure. When recording the surface structure from cross-section images, the achievable image resolution and quality is the limiting factor. Likewise, no individual, structure-specific failure mechanisms can be derived from the surface structure.:Inhaltsverzeichnis 5 Abbildungsverzeichnis 9 Tabellenverzeichnis 14 Abkürzungsverzeichnis 16 Symbolverzeichnis 17 1 Motivation 20 2 Stand der Wissenschaft und Technik 22 2.1 Verwendete Begriffe 22 2.2 Verbundwerkstoffe und Werkstoffverbunde 22 2.2.1 Faser-Kunststoff-Verbunde 24 2.2.2 Polymer-Metall-Verbunde 25 2.3 Fügen von Polymer-Metall-Verbunden 27 2.3.1 In-Mold Assembly 28 2.3.2 Kleben 28 2.3.3 Montage 29 2.3.4 Thermisches Fügen 31 2.4 Prüfung der Verbundfestigkeit 34 2.4.1 Prüfkörpergeometrien 34 2.4.2 Beständigkeit gegen Umwelteinflüsse 36 2.5 Verfahren zur Vorbehandlung der Metalloberfläche 38 2.5.1 Mechanisches Strahlen 39 2.5.2 Laserstrukturieren 40 2.5.3 Chemische und elektrochemische Verfahren 43 2.5.4 Beschichten 43 2.5.5 Weitere Verfahren 44 3 Zusammenhang zwischen Oberflächenstruktur und Verbundfestigkeit 46 3.1 Haftungsmechanismen 47 3.1.1 Stoffschluss 48 3.1.2 Kraftschluss 50 3.1.3 Formschluss 51 3.1.4 Skalenabhängigkeit 53 3.1.5 Eigenspannungen 54 3.1.6 Folgerungen 54 3.2 Charakterisierung der Oberflächenstruktur und Korrelation mit der Verbundfestigkeit 55 3.2.1 Standardisierte Rauheitsparameter 56 3.2.2 Fraktale Dimension 58 3.2.3 Anwendungsbeispiel 59 4 Zielstellung 62 4.1 Folgerungen aus dem Stand der Wissenschaft und Technik 62 4.2 Forschungshypothesen 63 5 Experimentelle Vorgehensweise 64 5.1 Charakterisierung der Ausgangswerkstoffe 64 5.2 Vorbehandlung der Metalloberflächen 67 5.2.1 Mechanisches Strahlen und alkalisches Ätzen 67 5.2.2 Thermisches Spritzen 68 5.2.3 Laserstrukturieren 68 5.3 Charakterisierung der Oberflächenstruktur 69 5.4 Mechanische Verbundprüfung 71 5.5 Verwendeter Fügeprozess 73 5.6 Statistische Betrachtung 75 6 Ergebnisse und Diskussion 77 6.1 Verbundfestigkeit in Abhängigkeit von der Oberflächenvorbehandlung 77 6.1.1 Rohrproben 77 6.1.1.1 Oberflächencharakteristika und Benetzung 77 6.1.1.2 Verbundfestigkeit und Korrelation mit Oberflächenkennwerten 81 6.1.1.3 Bruchflächenanalyse 85 6.1.2 Zugscherproben 90 6.1.2.1 Oberflächencharakteristika und Benetzung 90 6.1.2.2 Verbundfestigkeit und Korrelation mit den Oberflächenkennwerten 91 6.1.2.3 Bruchflächenanalyse 93 6.1.3 Ergebnisdiskussion 95 6.2 Verbundfestigkeit in Abhängigkeit von der Skalierung 97 6.2.1 Oberflächencharakteristika und Benetzung 97 6.2.2 Verbundfestigkeit und Korrelation mit Oberflächenkennwerten 102 6.2.3 Bruchflächenanalyse 102 6.2.4 Ergebnissdiskussion 106 7 Zusammenfassung und Folgerungen 108 8 Ausblick 112 Literaturverzeichnis 115 Anhang 129

Submitted by Rosina Valeria Lanzellotti Mattiussi Teixeira (rosina.teixeira@unisantos.br) on 2018-02-09T16:20:16Z No. of bitstreams: 1 Nadia Vitoria Schurkim.pdf: 1334833 bytes, checksum: a149e06207c121e89e8a083ad1ee9cd9 (MD5) / Made available in DSpace on 2018-02-09T16:20:17Z (GMT). No. of bitstreams: 1 Nadia Vitoria Schurkim.pdf: 1334833 bytes, checksum: a149e06207c121e89e8a083ad1ee9cd9 (MD5) Previous issue date: 2017-10-23 / The object of the present study is the Chevron case, an accident occurred in Campos dos Goytacazes, 107 km from the coast of the State of Rio de Janeiro, in the Brazilian Exclusive Economic Zone, between November 2011 and March 2012, which caused damages to the environment due to the oil exploration activity, focusing on issues relevant to the application of criminal law in maritime areas, highlighted by the denunciation of the federal public ministry and judicial decisions handed down in criminal proceedings whose application and outlines are not peaceful, which justifies the relevance of this study. Throughout this research, the maritime domain, sovereignty and jurisdiction of the Brazilian State in the Exclusive Economic Zone (EEZ) and the Continental Shelf (CS) will be analyzed. The problem is focused on the identification of the sovereignty of Brazil as a Coastal State, of the sea, sea surface and subsoil, the application of its legislative and judicial powers; in the verification if the EEZ and CS are part of the Brazilian maritime territory; in identifying the applicable legal regime in case of environmental crimes arising from the exploitation of oil in these maritime areas; extraterritoriality or territoriality of criminal law. The systematized study of the national and international legal system, through concepts of International Law, Criminal Law and Environmental Law, showed that the conflicts of interpretations observed in the case occur because the legal regime of EEZs and CS, established in UNCLOS III, when dealing with the distinction between rights of sovereignty and the jurisdiction of the coastal State does not provide clear definitions of maritime borders, providing a variety of interpretations. / O objeto do presente estudo consiste na análise do Caso Chevron, acidente ocorrido no Campos dos Goytacazes, a 107 Km do litoral do Estado do Rio de Janeiro, na denominada Zona Econômica Exclusiva brasileira, entre novembro de 2011 e março de 2012, que causou danos ao meio ambiental em decorrência da atividade de exploração de petróleo, tendo como foco as questões pertinentes à aplicação da lei penal nos espaços marítimos, destacadas da denúncia do órgão ministerial federal e das decisões judiciais proferidas no processo criminal cuja aplicação e contornos não são pacíficos, o que se justifica a relevância desse estudo. Ao longo dessa pesquisa, o domínio marítimo, a soberania e a jurisdição do Estado Brasileiro na Zona Econômica Exclusiva (ZEE) e na Plataforma Continental (PC) serão objeto de análise. A problemática concentra-se na identificação da soberania do Brasil, enquanto Estado Costeiro, do mar, da superfície e do subsolo marítimos, da aplicação de seus poderes legislativos e judiciários; na verificação se a ZEE e a PC integram o território marítimo brasileiro; na identificação do regime jurídico aplicável em caso de ocorrência de crimes ambientais decorrentes da exploração de petróleo nesses espaços marítimos; na extraterritorialidade ou da territorialidade da lei penal. O estudo sistematizado do ordenamento jurídico nacional e internacional, por meio de conceitos do Direito Internacional, Direito Penal e Direito Ambiental, demonstrou que os conflitos de interpretações observados no caso ocorrem porque o regime jurídico das ZEE e PC, estabelecidos na CNUDM III, ao tratar da distinção entre direitos de soberania e jurisdição do Estado costeiro não traz definições claras sobre as fronteiras marítimas, proporcionando diversidade de interpretações.

This diploma thesis is concerned with the numerical analysis of welded aluminim structures. In these structures, there are significant decreases in the mechanical properties at the area of the weld and in the heat affected zone as a result of welding. Within this thesis, simulations of quasi-statically loaded welded joints made from EN AW-6082 T6 alloy were performed to investigate the load capacity and ductility of these joints. Computations were performed using a programme system based on an explicit finite element method. To describe material anisotrophy, a nonlinear material model called the Weak texture model was chosen. Material properties of the weld and the heat affected zone were considered to be different from base material. The required material parameters were adopted from available literature, however, material tests and indetification procedure of these parameters were described. In comparison with the experimental data, the results of the numerical simulations showed a relatively good ability of models to capture load capacity of studied welded joints. Nevertheless, due to mesh sensitivity of models caused by localization of deformation, it was not possible to determine ductility of these joints.