Freie Universiẗat, Habil--Berlin, 2005.

This project focused on the integration of metal and book forms. Each piece addressed infertility and how this condition affects a couple, both physically and socially. The seven projects are connected through content interest and metal-smithing skills. The techniques used include: casting, sheet construction, enameling, hinge construction, resin insets, xerography and silver etching with Image-On. In additional to the metal-based artworks, this creative project also includes six large-scale photographs to illuminate the experiences of infertile individuals and couples. Three contemporary techniques - de-enameling, Image-On transfers, and Xerography - were used for the creation of Based on a True Story. This was the first usage of Image-On transfers and de-enameling during a creative project at Ball State University. / Department of Art

Thesis (Ph.D.)--Massachusetts Institute of Technology, Program in Science, Technology and Society, 2001. / Includes bibliographical references. / by Robert Martello. / Ph.D.

Orientador: Marcelo dos Santos Pereira / Banca: Ana Paula Rosifini Alves Claro / Banca: Rafael Humberto Mota de Siqueira / Resumo: Os fabricantes de latas vêm se tornando cada vez mais exigentes na qualidade e propriedades dos materiais utilizados na confecção de seus produtos. Um dos metais mais usados na indústria de manufatura de componentes obtidos através de estampagem e estiramento, como na fabricação de corpo de latas de bebidas, trata-se da liga de Alumínio AA3104. Isto se deve às suas propriedades mecânicas, estampabilidade, entre outra. Ela pertence ao grupo 3XXX, sendo que seu principal elemento de liga é o manganês (em pequenas quantidades / teores). Trata-se de uma liga não tratável termicamente, sendo que suas propriedades mecânicas são melhoradas a partir da formação de solução sólida e / ou deformação à frio. Desta forma, o presente estudo teve como objetivo avaliar de maneira detalhada a influência de duas diferentes condições de laminação à frio sobre o comportamento mecânico e microestrutural da liga de Alumínio AA3104: laminação à frio com tempo de resfriamento intermediário e sem tempo de resfriamento intermediário entre passes. A análise mecânica, por meio do Ensaio de Tração, mostrou que os materiais laminados com tempo de resfriamento intermediário obtiveram maiores valores de Limite de Escoamento (283,1 MPa) e Limite de Resistência a Tração (309,3 MPa) do que aqueles materiais laminados sem este tempo de resfriamento intermediário (273,2 e 300,0 MPa, respectivamente). Isto foi justificado pelo aumento da quantidade de partículas de segunda fase precipitados na matriz da liga, que... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The manufacturers of cans have become increasingly demanding in quality and in the properties of the materials used to make their products. One of the most used metals in the manufacturing industry of components obtained by stamping, as in the manufacture of beverage cans body, is the AA3104 Alloy. This is due to its mechanical properties, stampatability, among others. It belongs to the 3XXX group, and its main alloying element is manganese (in small amounts / contents). It is an alloy not thermally treatable, where its mechanical properties are improved from the formation of solid solution and / or cold forming. Therefore, the present study had as objective to evaluate in detail the influence of two different conditions of cold rolling on the mechanical and microstructural behavior of the aluminum alloy AA3104: cold rolling with intermediate cooling time and without intermediate cooling time between passes. The mechanical analysis, through the Tensile Test, showed that rolled materials with intermediate cooling time obtained higher values of Yield Strength (283,1 MPa) and Ultimate Tensile Strength (309,3 MPa) than those laminated materials without this intermediate cooling time (273,2 and 300,0 MPa, respectively). This was justified by the increase in the amount of second phase particles and precipitated dispersions in the alloy matrix, which made difficult the movement of dislocations, making the material more resistant / Mestre

This thesis presents a study into the enhancement of productivity in micromilling processes by considering a fundamental treatment of tool path trajectory generation techniques and process optimization strategies that account for the impact of scale effects present in high-speed, high-precision micromachining operations. Micromilling is increasingly applied to the production of a wide variety of micro components, due to its high precision and flexibility. However, the productivity of micromilling is limited by the low feedrates necessitated by the inherent high precision and small feature size. In this study, several scale effects present at the microscale are identified, in particular the increase of the ratio of tool size to feature size, and the corresponding impact on trajectory generation and process optimization is investigated. The scale effects are shown to cause increased geometric error when the standard method of VF-NURBS is applied to microscale feedrate optimization. The method of Enhanced Variable-Feedrate NURBS (EVF-NURBS) is proposed and shown to successfully compensate for the scale effects leading to reduced geometric error. A key contribution of this study is the construction and experimental validation of the Variable-Feedrate Intelligent Segmentation (VFIS) method for increased feedrates and improved stability. The VFIS method provides a cutting time reduction of more than 50% in some cases, while effectively constraining geometric error. Two tool size optimization schemes are presented for maximizing productivity and minimizing geometric error while accounting for dynamic effects uniquely present at the microscale. Finally, the development of a low-cost, high-precision micro-mesoscale machining center (mMC) is presented.

Thesis (Ph. D.)--University of Missouri-Columbia, 2001. / Typescript. Vita. Includes bibliographical references (leaves 162-168). Also available on the Internet.

Thesis (Ph. D.)--University of Missouri-Columbia, 2001. / Typescript. Vita. Includes bibliographical references (leaves 162-168). Also available on the Internet.

Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: product geometry; hot rolling; high speed rolling; rolling simulation; bar and rod rolling; free surface; finite element analysis. Includes bibliographical references (p. 69-75).

Aluminum alloys are of great interest to the automobile industry for vehicle mass reduction, which improves vehicle performance and reduces emissions. Hot forming processes, such as superplastic forming (SPF) and quick-plastic forming (QPF) have been developed to take advantage of the improved formability of certain aluminum materials at elevated temperature. Commercial fine-grained aluminum alloy AA5083 sheet is the most commonly used material in the SPF and QPF forming processes. Hot formability of AA5083 is often limited by material cavitation during forming, which makes understanding and controlling cavitation an issue of primary importance for improving hot sheet forming processes. The thermomechanical processing history of AA5083 can strongly affect superplastic performance, causing variations in formability between material lots. These variations are closely related to microstructure, and intermetallic particles are prime suspects for controlling cavitation behavior. However, there has been little more than anecdotal evidence available that these particles nucleate or influence cavitation. Interactions between intermetallic particles and cavities were, thus, analyzed using both two-dimensional (2-D) and three-dimensional (3-D) microstructure characterization techniques. Analysis of 3-D microstructures from AA5083 specimens deformed under conditions similar to the SPF and QPF processes provide conclusive proof that cavities form at specific types of intermetallic particles. Differences in cavitation between materials deformed under the SPF and QPF processes result from differences in deformation mechanisms. These differences are illustrated by the formation of filaments on fracture surfaces of superplastically deformed AA5083 specimens, which have been characterized. / text

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