Avaliação da tenacidade em um aço microligado, grau API, para aplicação em linhas dutoviárias de petróleo e gás

In order to study the mechanical properties of micro alloyed steel API 5L X70, a material used to manufacture pipes for pipeline transportation lines for use in oil and gas, a study was made of toughness, tensile strength, impact strength, hardness and microstructure steel. To perform these various tests were made where they can acquire the characteristics of the material. Were performed at the Faculty of Engineering in Guaratinguetá in the Department of Materials and Technology and the tensile tests, Charpy impact test, metallography and hardness testing of material API 5L X70, all tests were done with the help of technical laboratories. With these data can be an analysis of the material about his tenacity, his toughness and fragility, its hardness, its yield strength and its maximum voltage. After being asked the analyzes discussed the results showed that the micro alloyed steel API 5L X70 steel is a very tenacious, it absorbs impact energy of 300 Joules though without a break for the full body of evidence showing its tenacity

O léxico da apicultura e da melinponicultura no Brasil: limites e flexibilidade para sua fixação em um dicionário terminológico

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Propriedades físico-químicas e mecânicas, potencial bioativo e caracterização da interface dentina-cimento de cimentos endodônticos experimentais à base de cimento Portland associados à radiopacificadores micro e nanoparticulados

Pós-graduação em Odontologia - FOAR

Estereótipos linguísticos: questões tradutórias derivadas do tratamento de fraseologismos em dicioinários bilíngues

Reconhecer as unidades fraseológicas de um texto ao traduzi-lo representa para o tradutor uma das grandes dificuldades impostas à sua tarefa de interpretação. Para além do simples reconhecimento, a identificação de um equivalente apropriado na língua de chegada, considerando seu registro de uso e a carga metafórica que encerra, dentre outros aspectos presentes em tais unidades, impõem ao tradutor um árduo trabalho de pesquisa e análise linguística. Analisamos aqui, além da organização da mega, macro e microestrutura, a tradução para o português de unidades fraseológicas em três dicionários bilíngues na direção espanhol/português, a saber: Señas – Diccionario para la enseñanza de la lengua española para brasileños (Universidad Alcalá de Henares), Diccionario Bilíngüe de Uso Español-Portugués/Português-Espanhol e o Gran Diccionario Español/Portugués/ Português/Espanhol. A análise é feita a partir de um levantamento abrangendo as unidades agrupadas pelo campo semântico 'nome de animal', especificamente as organizadas na entrada 'gato'. Embora a expressão de idéias afins seja comum a diferentes línguas e culturas, o maior ou menor grau de idiomatismo de algumas expressões pode ocasionar ao tradutor diferentes níveis de dificuldade ao tentar estabelecer equivalentes para os dois idiomas.

Proposta de modelo de dicionário terminológico onomasiológico dos neônimos da Biotecnologia

A Biotecnologia teve uma evolução muito grande nas últimas duas décadas, evolução que foi acompanhada por uma intensa criação de neônimos. O objetivo principal deste artigo é analisar o funcionamento de um Dicionário terminológico onomasiológico dos neônimos da Biotecnologia com equivalências em inglês. As principais referências metodológicas e teóricas que utilizamos em nosso trabalho foram Alpìzar-Castillo (1997), Alves (2009, 2008, 2007), Babini (2006, 2001a, 2001b), Barbosa (1995), Barros (2004), Berber Sardinha (2004), Cabré (1999a, 1999b, 1993), Felber (1984), Rey-Debove (1971), Rondeau (1984). A metodologia empregada no tratamento terminográfico e na pesquisa terminológica bilíngue foi norteada pela TCT (Teoria Comunicativa da Terminologia), que nos auxiliou a lidar com as diferenças existentes entre os dois idiomas estudados. Para a coleta dos neônimos empregamos a metodologia proposta por Alves (2001) e utilizamos como corpus as 34 primeiras edições (versão eletrônica) da revista Biotecnologia. Uma vez coletados os termos, procedemos à organização do sistema nocional do domínio e sucessivamente elaboramos a macroestrutura e a microestrutura de nosso dicionário, utilizando a metodologia proposta por Babini (2006, 2001a, 2001b). Para que fossem possíveis buscas de tipo onomosiológico, partindo dos semas dos termos, incluímos na microestrutura o semema de cada termo e optamos por realizar nosso dicionário em formato eletrônico. A análise do funcionamento do dicionário mostrou a eficácia do sistema que permite identificar o termo partindo de um ou mais semas, escolhidos por meio de telas no software.

As cores da fauna e da flora: um dicionário especial composto por cromônimos

This work aims to talk about some considerations arisen from the process of elaboration of a special dictionary composed of chromatic phrases found in Botanic and Zoology domains, as well as to present its macrostructure and microstructure. Our efforts are concentrated on creating a simple and complete structure, which may be the most adequate for the audience, i.e., for specialists and students connected to the Environment area.

Análise microestrutural e propriedades mecânicas do aço DP 600

Seeking to meet the requirements: relatively low cost of materials and wide applicability in the automotive industry. The best option was the steel Dual Phase (DP), because that is lighter, have high formability, meet the cost requirements and applicability, steel Dual Phase (DP) came to meet these requirements with its two-phase microstructure, ferrite and martensite microstructure who claim to respect and mechanical properties. In this context, the aim of this study was to correlate the microstructure revealed in metallography to the mechanical properties observed in hardness and tensile tests. The microstructure is revealed by etching in 2% nital and then captured images of the sample were processed in ImageJ software to aid in determining the volume fraction of the phases present. Therefore, the mechanical properties were evaluated with respect to volume fraction of the steel layers and analyzed DP 600 together with the mechanical properties obtained by Rockwell hardness test and tensile test. With the values of the mechanical properties calculated and tested, it was possible to describe the method of metallography, as the attack phase and counts, so that it can use this relationship tested/calculated property as a qualitative analytical tool. The method used for the correlation between the microstructure and mechanical properties confirmed the importance of the phases present in the Dual Phase steel to obtain the desired mechanical properties in the application of the steel

Análise microestrutural de tubos API N80 soldados pelo processo HF/ERW para prospecção de petróleo e gás

On the grounds of the great advances achieved over recent years, the process HF/ERW (High-Frequency/Electric Resistance Welding)welded pipe have played an active role in the oil and gas industry for deep water applications, at high and extremely low temperatures, under high pressure and in highly corrosive environments, gradually replacing manufactured pipes by other processes. However, studies have shown that defects in the welded joints are a the leading causes of pipelines failures, which has required the determination of toughness values in this region, in compliance with the strict recommendations of the codes and standards with manufacturers and construction companies, on the oil and gas sector. As part of the validation process required toughness values, this research project focuses on a microstructural analysis in HF / ERW tubes microalloyed, steel grade API 5CT N80, designed to explore oil and gas in deep waters, the subject of strategic relevance to the country because of the recent discoveries in the Santos mega fields: Tupi and Libra (pre-salt). In this scientific work will be presented and discussed the results of mechanical tensile and Charpy, a few CTOD tests curves (showing the trend of toughness values to be obtained), and the microstructures of the base material obtained by optical microscopy, with special emphasis on the formation of non-metallic inclusions in the welded joint

Caracterização de cerâmicas a base de nitreto de silício para aplicações estruturais

The need for development of new materials is a natural process in the companies’ technological point of view, seeking improvements in materials and processes. Specifically, among the materials, ceramic exhibit valuable properties, especially the covalent ceramics which have excellent properties for applications which requires the abrasion resistance, hardness, high temperatures, resistence, etc. being a material that has applications in several areas. Most studies are related to improvement of properties, specially fracture toughness that allows the expansion of its application. Among the most promising ceramic materials are silicon nitride (Si3N4) which has excellent properties. The goal of this work was the development and caracterization of Si3N4-based ceramics, doped with yttrium oxide (Y2O3), rar earth concentrate (CTR2O3) and cerium oxide (CeO2) in the same proportion for the evaluation of properties. The powders' mixtures were homogenized, dried and compressed under pressure uniaxial and isostatic. Sintering was carried out in 1850 ⁰C under pressure of 0,1MPa N2 for 1 h with a heating rate of 25 ⁰C / min and cooling in the furnace inertia. The characterizations were performed using Archimedes principle to relative density, weight loss by measuring before and after sintering, phase analysis by X-ray diffraction, microstructure by scanning electron microscope (SEM), hardness and fracture toughness by the method Vickers indentation. The results obtained showed relative density of 97-98%, Vickers hardness 17 to 19 GPa, fracture toughness 5.6 to 6.8 MPa.m1/2, with phases varying from α-SiAlON and β-Si3N4 depending the types of additives used. The results are promising for tribological applications and can be defined according to the types of additives to be used

Obtenção de rochas sintéticas a partir de resíduos de vidro comercial e pó de granito

Pós-graduação em Engenharia Mecânica - FEG

Caracterização de uma cerâmica 3Y-TZP e avaliação do efeito de tratamentos de superfície na adesão da cerâmica ao glaze ou cimento resinoso

Pós-graduação em Odontologia Restauradora - ICT

Análise da pulsação térmica do processo TIG na soldagem da liga AA6063T6

Pós-graduação em Engenharia Mecânica - FEB

Concreto com adição de cinza de bagaço de cana-de-açúcar

Pós-graduação em Engenharia Civil - FEIS

Estudo da fadiga em liga de alumínio aeronáutico 7475-T761

This work will address the study of fatigue conditions with constant load in an alloy of aluminum analysis 7475 - T761, so we can better understand the conditions of the aircrafts which contain this alloy in their structures. A literature review, which was discussed the concepts of fracture mechanics, fatigue, aeronautical components, chemical analysis of aluminum alloys, fatigue problems that appears in the aircrafts, metallographic analysis, and testing of optical microscopy tensile, fatigue and microhardness, surface analysis (MEV) study of the chemical composition of the alloy in question, the main causes of crashes, was performed, completing the work, analysis of data from tensile test, hardness and fatigue together with the interpretation of images of optical microscopy and scanning electron was taken. The data indicated the high mechanical strength of the alloy, along with its microstructure indicating elongated grains and high surface contour, which shows such resistance by hindering the movement of dislocations. The grooves are clearly shown in the MEV images as well as the classic with increased fatigue loading and subsequent reduction of the number of cycles to rupture behavior shown in the graphs. Therefore we observed the optimal behavior is supported by the league when subjected to fatigue loadings

Estudo do comportamento em fadiga das ligas AA6005, AA6063 e AA6351

Aluminum alloys have shown great potential for the automotive industry, especially aluminum alloys 6xxx series. This category has good mechanical strength and excellent corrosion resistance, important for the areas of construction and transport. The automotive industry has always shown great interest in the study of fatigue behavior, because structural components are subjected to cyclic and vibration loads, generating cracks and fracturing. The mechanical response depends on the material properties, applications, surface condition and microstructure. In this work was study the fatigue behavior of high cycle of machined bodies (not polished) and the effect of roughness on the fatigue life for three aluminum alloys of 6xxx series: AA6005, AA6351 and AA606, all in the T6 condition . S / N curves were made from fatigue tests in rotating bending (R = -1). The influence of roughness was studied by measuring the roughness of each specimen. Was compare the fatigue behavior of polished specimen and not polished specimens. The fractured surfaces of samples were observed by MEV, and it was observed that most of nucleation sites for fatigue crack is initiated below the surface