Orientador: Luise Weiss / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Artes / Made available in DSpace on 2018-08-24T21:31:09Z (GMT). No. of bitstreams: 1 Silva_WilsonRobertoda_D.pdf: 16280272 bytes, checksum: 11413fbb861442a3e75dea59047ef186 (MD5) Previous issue date: 2014 / Resumo: Esta tese é resultado de uma pesquisa iniciada no mestrado e consiste na produção de estampas predominantemente provenientes de matrizes de gravura em metal e xilogravura, gravadas para serem capazes de permutar suas formas entre elas separadamente e formar combinações complementares, híbridas e aleatórias resultantes do processo de impressão. O principal objetivo é obter o maior número possível de estampas diferentes de um conjunto de matrizes e com isso, não só conciliar visualmente erotismo e anatomia humana na gravura, mas também ressaltar a variedade, como atributo dos organismos que se reproduzem sexualmente e perecem, para dar início a um novo ciclo / Abstract: This thesis is the result of a research started in the master's program and consists of the production of prints mainly from etching plates and woodcut, carved to be able to permute its shapes among them separately and create complimentary, hybrid and random combinations resulting from the printing process. The main goal is to obtain the largest possible amount of different prints from a set of plates and, with that, not only visually conciliate eroticism and human anatomy on the engraving, but also highlight the variety, as an attribute of the organisms that reproduce sexually and perish, in order to initiate a new cycle / Doutorado / Artes Visuais / Doutor em Artes

Orientador: Sérgio Tonini Button / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica / Made available in DSpace on 2018-08-20T23:55:31Z (GMT). No. of bitstreams: 1 Judice_GustavoHenrique_M.pdf: 13713684 bytes, checksum: ca6f8c3e7b2f080bdd41cef45bd2a552 (MD5) Previous issue date: 2012 / Resumo: O processo de conformação denominado Laminação Transversal com Cunha, industrialmente conhecido como Cross Wedge Rolling (CWR), tem se destacado na indústria pela sua flexibilidade, produtividade e economia de material, porém pode apresentar defeitos internos que, em alguns casos, inviabiliza a utilização dos produtos. É um defeito de difícil avaliação quanto a sua formação e propagação e ainda não se desenvolveu um mapa de processamento que represente de forma precisa e consistente as condições em que o defeito pode aparecer. Este estudo apresenta resultados dos campos de deformação plástica, tensão, temperatura e do aspecto do desenvolvimento de defeitos internos, acrescentados ao tarugo, através de simulações do processo de laminação transversal com cunha. O estudo se desenvolveu na criação de modelos de elementos finitos pelo software comercial Abaqus® versão 6.9-2, que seguiram condições geométricas de um processo real. Inicialmente, modelos bidimensionais foram simulados apresentando diferentes densidades de malha. Posteriormente, modelos com um vazio central foram simulados e confirmou-se a boa correlação de seus resultados com os encontrados na literatura. Na sequência, um modelo com propriedades de porosidade indicou que a região central do tarugo apresentou a maior densidade de vazios. Também foram simulados modelos com vazios e inclusões de diferentes tamanhos, disposições e formas, com destaque para a região em volta das inclusões, por apresentar a formação de vazios. Por último, foram simulados dois modelos tridimensionais, um apresentando um vazio interno no centro do tarugo, que apresentou os campos de tensão, de deformação plástica e de temperatura parecidos com o do modelo bidimensional correspondente, porém com valores maiores. O outro modelo tridimensional apresentou propriedades de porosidade e indicou que a maior probabilidade de formação de defeitos se concentrou na extensão longitudinal central do tarugo. Os maiores níveis de temperatura, deformação plástica e tensão foram presentes na região central do tarugo, tanto nos modelos bidimensionais quanto nos tridimensionais, indicando que essa região apresentou os maiores níveis de solicitação, o que pode favorecer o surgimento dos defeitos internos / Abstract: Cross Wedge Rolling is a metal forming process which has become very important in the industry for its flexibility, productivity and material savings, although presenting the critical problem of internal defects generation which restricts the use of rolled products, since it is very difficult to asset the defects formation and propagation and it was still not found a processing map to represent CWR with precise and consistent conditions with which the defect should or should not appear. In this study some numerical results are presented in terms of plastic strain, stress, temperature and the development of internal defects within the billet. These results were obtained with different finite element models developed with the commercial software Abaqus Version 6.9-2 by simulating materials with different internal characteristics, representing geometric conditions identified in the actual process. Initially two-dimensional models were simulated with different mesh densities; then, models with a central void were simulated and a good relationship was found with the results found in the literature. Then a model was simulated to characterize the porosity of the material, and was verified that the porosity is concentrated at the center of billet. Other models were also simulated with voids and inclusions of different sizes, distributions and shapes which were added manually. These models showed similar results, and the models with inclusions developed voids within the metallic matrix. Finally, two models (three-dimensional) were simulated, one with an internal void in the center of the billet, which showed the development of stress fields, plastic deformation and temperature similar to that corresponding two-dimensional model, but with higher values. The other three-dimensional model, which presented properties of porosity, showed that the highest probability of defect formation focused in the central and longitudinal extent region of the billet. All models showed that the central region of the billet presents the highest levels of temperature, plastic strain and stress probably favoring the initiation of internal defects / Mestrado / Materiais e Processos de Fabricação / Mestre em Engenharia Mecânica

No description available.

Please read the abstract in the section, 00front of this document / Dissertation (M Eng (Electronic Engineering))--University of Pretoria, 2002. / Electrical, Electronic and Computer Engineering / MEng / unrestricted

No description available.

Statement of the problem: This study is to show how metal sculpture can be used in art education.

No description available.

In March 1983, the General Electric Company Drive Systems Operations Division introduced the Distributed Micro-Controller (DMC) to the automation industry. The processor is used for high speed digital control of a number of devices. One of the first applications of the DMC was control high speed motor positioning for metal industry plant automation. In many attempts to control high speed position regulation, the problems that prevented the use of digital controllers included high cost, slow processing time, or poor mathematical capabilities. Usually to obtain two of these constraints, the third constraint became inhibitive (i.e., if processing time and mathematical capabilities were acceptable, then the cost of the controller was to high to make the use of the control device desirable). By incorporating the co-processor capabilities of the Intel 8087, a new era of digital control was available. By using the mathematical capabilities of the 8087 in conjunction with the logical processing capabilities of the 8086, a device was available to perform the mathematical calculations desired within an acceptable price range. The use of the two processes as parallel processors (at times synchronous processors, and at other times asynchronous processors) decreased the position regulation execution time to the point that the device met all three requirements needed. The parallel programming techniques that made the DMC acceptable as a high speed position regulation device are discussed in this thesis. / Master of Science

Forward slip (FS), the percent difference between the roll velocity and the strip exit velocity, was achieved by altering four variables: reduction, rolling speed, lubricant viscosity, and roll roughness. A two-high laboratory mill was used to roll strips of unalloyed, H-18 temper aluminum. An SEM and a Leitze Orthoplane microscope were used to examine the strip surface. A grainy pattern, which varied with the rolling condition, was observed on the sample surface. The grainy pattern resulted from three effects: grooves imprinted by the rolls, black spots identified as hydropitting (HP), and horseshoe shaped marks which were attributed to FS. These effects were studied and the following conclusions drawn. Higher viscosity, high speed, and rough rolls produced more HP. Increasing reduction produced HP with the viscous lubricant, oil, but less HP with kerosene. No HP was observed at 59 percent reduction but FS marks occurred and were more prevalent with oil than kerosene. The smooth rolls produced more FS marks than the rough rolls. Two postulates were presented to explain the pattern of these effects. First, the FS mark lengths were of the same order of magnitude as one set of theoretically calculated relative slip lengths; indicating that FS was responsible for the marks. Second, the absence of HP and presence of FS marks, in particular cases, indicated that a hydraulic effect was responsible for the FS marks. The FS marks would have been created as localized high pressure lubricant flowed across the surface to equalize the film pressure. / Master of Science

This study was designed to determine the employment opportunities in the steel fabrication industry of the Greater Fort Worth Metropolitan Area, and to ascertain what skills and knowledge were required of the prospective employee and which of these skills were being taught in the Industrial Arts metalworking laboratories. The Machine Metalworking I & II curriculum was established and related to information gained through a questionnaire sent to participating steel fabrication firms. The study was used to determine present and anticipated employment opportunities in the steel fabrication industry and aid in evaluating the curriculum of Machine Metalworking I & II as it relates to the employment requirements of the steel fabrication industry.