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Cold working effects on mechanical properties in sheet metal joining for automotive applicationsBlake, David Matthew, January 2006 (has links) (PDF)
Thesis (M.S. in mechanical engineering)--Washington State University, December 2006. / Includes bibliographical references (p. 102-107).
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Characterization of mechanical properties and study of microstructures of friction stir welded joints fabricated from similar and dissimilar alloys of aluminumAkula, Deepa Reddy. January 2007 (has links)
Thesis (M.S.)--University of Missouri-Columbia, 2007. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on March 19, 2008) Includes bibliographical references.
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Analysis of bonded repair patches on cracked thin sheetsYoung, A. January 1988 (has links)
No description available.
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Návrh a kontrola parametrů zásobní smyčky linky pro zpracování plechu / Design and examination of parameters of the line stock loop for sheet metal processingNovák, Tomáš January 2020 (has links)
Master thesis is focused on determination of stress and deformation state of metal sheet in stock loops of non-standard dimension. The main goal was creating numerical model and de-termination of maximal possible stock of metal sheet for all requested parameters. The problem was solved using Finite element methods in the software ANSYS. Results were handed to ŽĎAS, a.s. corporation, where they will be used for design of the lines for metal sheet proces-sing of non-standard dimension. Another goal was estimation, how the residual stress in metal sheet can effect the observed stress state.
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Performance of Polymer Coatings Under Forming ConditionsPurohit, Zalak 2010 December 1900 (has links)
Prepainted metal sheets being environment friendly and cost effective as compared to postpainted metal sheets, are widely used in construction, packaging, transportation and automotive industries. One of the key requirements for prepainted coatings is to retain its surface quality and properties during forming process. During forming process, major surface damage occurs when the coated sheet is bent and un-bent around the die corner. To reduce surface damage of coatings, proper control of the parameters during forming and detail study of the surface conditions is required. In the present study, influence of forming parameters such as die radius, lubrication and specimen material are investigated. The influence of these parameters on friction, surface damage and properties of polymer coatings are evaluated. Experiment set-up is built to conduct bending under tension test. This test gives a better way to evaluate coating performance, as it closely simulates the die region of real forming process and considers bending effects. Experimental results show increase in friction and surface damage with decrease in die radius. Moreover, with decrease in die radius hardness of the coating decreases and strain in the specimen increases. Lubrication has some effect on coefficient of friction, but the influence is not as significant as that of die radius. This is attributed to the fact that, the polymer coating itself acts as a solid lubricant in the test. Material effect was studied, polypropylene coating being the softer material compared to PVDF coating shows more surface damage in the form of scratches. Numerical simulations were performed using Finite Element Analysis package (FEA) Abaqus. A 2D model was built, exploiting the plane strain condition for bending under tension test. Numerical simulations indicate that maximum contact pressure and von Mises stress are concentrated at the beginning of the drawing edge. Apart from the location, the value of contact pressure was higher for smaller die radius. Thus, experiments help in studying the effect of forming parameters on coating performance and numerical simulations provide more insight into the critical areas where stresses are high. Numerical simulations also provide a scope to study the effect of material and geometric parameters on performance of coatings without running experiments.
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Development of tailored preform processing technology for net-shape manufacturing of large monolithic structuresChitti Babu, Surendra, January 2007 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 2007. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on January 31, 2008) Vita. Includes bibliographical references.
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Výroba kovového třmenu zásuvky sdruženým nástrojem / Manufacturing of metal yoke of electrical socket by compound toolSvozilová, Lucie January 2021 (has links)
The project elaborated design of technology production of the metal yoke of electrical socket made of steel DX51D + Z200 by compound progressive tool. Stock material for series of 200 000 pieces is a strip of coil. Manufacturing is realised in five steps consist of cutting, bending and flanging. For flanging was constructed a special mechanism for whose is necessary to use hydraulic counterholder, which is sold as a special peripheral equipment of manufacturing machine. The machine choice was adapted to this criterium. The servopress DSF-N1-800A was chosen as a manufacturing machine, which is made by AIDA company. The press can produce force of 800 kN and make work of 4000 J. Selling price of a one yoke is 24,5 Kč when the profit is one hundred percent. The break-even point comes with 58 140 made piece.
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OBJETOS GRAVADOS: UMA EXPERIMENTAÇÃO POÉTICA A PARTIR DA TÉCNICA DE GRAVURA EM METAL / TRAMPLED OBJECTS: A POETIC EXPERIMENT ORIGINATED IN THE TECHNIQUE OF INTAGLIOPinto, Luciana Estivalet 27 March 2012 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This research explores metal sheet carving from the technique of intaglio. Each
"trampled object" is inspired by the study of medieval illuminations images (from the
tenth century to the fifteenth century), where the ornament is the focus of artistic
creation. In this dissertation, I present my understanding of the term "intaglio" and I
define my plastic work as "trampled objects" because using the nomenclature
"matrix" requires a series of procedures that are ignored by me at the moment,
namely, the imprinting of copies. However, I develop the technique of intaglio using
metal sheets of copper and yellow brass, which are displayed directly to the public, in
other words, without the traditional pattern of the resulting imprinting. Contemporary
visual artists who also exhibit metal sheets [Laurita Salles (1952), Ana Alice
Francisquetti (1955) and Otilia Carrique (1954)] are quoted and used to point out the
central question guiding this research: the possibility of making metal sheets, which
were seen as part of the process of intaglio, come to aesthetics fruition. I briefly
comment on some relations of illuminations with the work developed, as it is inspired
by medieval ornaments. I analyze some points of interest in the history of illumination
and also comment on some contemporary paradigms of art from the thought of Yves
Michaud (2008) mainly. Finally, I display to the reader the works developed during
this survey. I also broach about the technical elaboration of the works, reporting all
the way traced in the atelier, and argument on each of the four sets of engraved
objects created (Pequenos Portais, Detalhes Iluminados, Citações Medievais and
Filigranas), comparing them to images of some illuminations studied. / Esta pesquisa explora a gravação de chapas metálicas a partir da técnica da gravura
em metal. Cada objeto gravado é inspirado no estudo de imagens de iluminuras
medievais (desde o século X até o século XV), onde o ornamento é o foco da
criação plástica. Nesta dissertação, apresento a investigação sobre o termo
gravura e catalogo os trabalhos desenvolvidos como objetos gravados , pois
aderir à nomenclatura matriz requer uma série de procedimentos que não são
salientados neste momento, a saber: a impressão de cópias. Todavia, desenvolvo
na técnica da gravura em metal a gravação de chapas de cobre e latão amarelo que
são expostas diretamente ao público, ou seja, sem a tradicional estampa resultante
da impressão. Algumas gravadoras contemporâneas que também trabalham com a
exposição de chapas de metal são citadas: Laurita Salles (1952), Ana Alice
Francisquetti (1955) e Otilia Carrique (1954), através delas aponto a questão central
norteadora da pesquisa, que é a possibilidade de fruição estética através da
materialidade das chapas metálicas que antes eram vistas apenas como uma etapa
do processo da gravura. Brevemente, comento algumas relações das iluminuras
com o trabalho desenvolvido, já que este é inspirado nos ornamentos medievais.
Analiso alguns pontos de interesse na história da iluminura e alguns paradigmas
contemporâneos da arte a partir do pensamento de Yves Michaud (2008),
principalmente. Por fim, apresento os trabalhos desenvolvidos durante a pesquisa,
discorro sobre o processo técnico de elaboração das obras, relato todo o percurso
traçado em ateliê; e argumento sobre cada uma das quatro séries de objetos
gravados criadas: Pequenos Portais, Detalhes Iluminados, Citações Medievais e
Filigranas, comparando-as, em alguns momentos, com as imagens de algumas
iluminuras estudadas.
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Propriedades mecânicas e microestruturais de aços de alta resistência e baixa liga soldadosPerini, Felipe Gustavo 15 July 2008 (has links)
Na presente dissertação foram investigadas as propriedades mecânicas e microestruturais, antes e após o processo de soldagem, dos aços ZSTE380 e DOGAL800, que são aços de alta resistência e baixa liga (ARBL), além do aço convencional ZAR230. O principal objetivo do trabalho foi avaliar possíveis modificações nessas propriedades e verificar a possibilidade de substituir o aço convencional por um dos aços ARBL. Por serem mais resistentes os aços ARBL podem ser usados em elementos estruturais menos robustos, o que reduz o peso e a emissço de gases poluentes dos veículos. Primeiramente, verificaram-se diferentes extensões da zona termicamente afetada para os três aços soldados, onde é observada a maior extensão no DOGAL800 e a menor no ZAR230. A análise microestrutural revelou o crescimento do tamanho de grão austenítico em relação ao metal base nessa região para os aços ZSTE380 e DOGAL800, gerando um pronunciado aumento da resistência devido à transformação martensítica. O caso mais marcante ocorreu no DOGAL800, em cuja zona termicamente afetada observou-se a formação de martensita de baixo carbono, que é uma fase dura do aço, porém de baixa ductilidade. Os perfis de microdureza indicaram que não houve uma alteração significativa na dureza da zona termicamente afetada no ZAR230, enquanto que para o DOGAL800 observa-se um considerável aumento na mesma, confirmando a formaçao de martensita. Os limites de escoamento determinados pelos ensaios de tração não apresentaram diferenças significativas entre os corpos de prova com e sem solda se analisados de forma global, porém um ensaio de microtração, isso seria revelado. Contudo, nos ensaios de fadiga dos corpos de prova sem solda observou-se uma maior resistência à fadiga para os aços DOGAL800 e ZSTE380 em relação ao ZAR230. Após o processo de soldagem, os aços ARBL apresentam uma significativa redução da resistência a fadiga, estando abaixo da resistência à fadiga do ZAR230 para ensaios acima de um milhão de ciclos. Os resultados apresentados são explicados com base na relação entre as características microestruturais e propriedades mecânicas dos aços antes e após a soldagem. / Submitted by Marcelo Teixeira (mvteixeira@ucs.br) on 2014-05-21T16:18:45Z
No. of bitstreams: 1
Dissertacao Felipe Perini.pdf: 4638294 bytes, checksum: 04b47e3d737143948a0776e96d6588a1 (MD5) / Made available in DSpace on 2014-05-21T16:18:45Z (GMT). No. of bitstreams: 1
Dissertacao Felipe Perini.pdf: 4638294 bytes, checksum: 04b47e3d737143948a0776e96d6588a1 (MD5) / In the present work we investigated the mechanical and microstructural proprieties of the ZSTE380 and DOGAL800 high strength low alloys steels (HSLA), comparing to the conventional ZAR230 steel, before and after welding. The main purpose is to detect possible modifications on these steels during the welding process, and to verify the possibility of replacing the conventional ZAR230 steel by one of the HSLAs. Since HSLA steels possess higher mechanical resistance, they can be used in less robust structures, which reduce the weight of the automobiles, and consequently reduce the emission of pollutant gases. We observed different extensions of the heat-affected zone for the three welded steels, with a higher extension in the DOGAL800 and the smaller extension in the ZAR230. Microstructural analysis revealed austenite grain growth in the heat-affected zone, in relation to the base metal in this region for the steels ZSTE380 and DOGAL800, becoming a remarkable increase of resistance due to martensite transformation. The most remarkable case happened in the DOGAL800, where we observed formation of low carbon martensite in the heat-affected zone, being this a harder phase of the steel, but with low ductility. The microhardness profiles indicated that it did not happen a significant change in hardness of the heat-affected zone of the ZAR230, while for the DOGAL800 it is observed a considerable increase in hardness, corroborating the hypothesis of martensite formation. The yield strength obtained form stress-strain curves didn?t revealed any significant differences between welded and without weld samples, if analyzed in a global way, but in a microtensile test, it would be reveled. The samples without weld submitted to the high-cycle fatigue test presented different fatigue resistance, where the DOGAL800 showed the greatest fatigue resistance, followed by the ZSTE380 and finally the ZAR230. However after the welding process we observed a significant reduction in the fatigue resistance of the HSLA steels, even below the ZAR230 resistance for tests above 1 million cycles. The results were explained relating the microstructure properties and the mechanical properties of the three steels, before and after welding.
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Propriedades mecânicas e microestruturais de aços de alta resistência e baixa liga soldadosPerini, Felipe Gustavo 15 July 2008 (has links)
Na presente dissertação foram investigadas as propriedades mecânicas e microestruturais, antes e após o processo de soldagem, dos aços ZSTE380 e DOGAL800, que são aços de alta resistência e baixa liga (ARBL), além do aço convencional ZAR230. O principal objetivo do trabalho foi avaliar possíveis modificações nessas propriedades e verificar a possibilidade de substituir o aço convencional por um dos aços ARBL. Por serem mais resistentes os aços ARBL podem ser usados em elementos estruturais menos robustos, o que reduz o peso e a emissço de gases poluentes dos veículos. Primeiramente, verificaram-se diferentes extensões da zona termicamente afetada para os três aços soldados, onde é observada a maior extensão no DOGAL800 e a menor no ZAR230. A análise microestrutural revelou o crescimento do tamanho de grão austenítico em relação ao metal base nessa região para os aços ZSTE380 e DOGAL800, gerando um pronunciado aumento da resistência devido à transformação martensítica. O caso mais marcante ocorreu no DOGAL800, em cuja zona termicamente afetada observou-se a formação de martensita de baixo carbono, que é uma fase dura do aço, porém de baixa ductilidade. Os perfis de microdureza indicaram que não houve uma alteração significativa na dureza da zona termicamente afetada no ZAR230, enquanto que para o DOGAL800 observa-se um considerável aumento na mesma, confirmando a formaçao de martensita. Os limites de escoamento determinados pelos ensaios de tração não apresentaram diferenças significativas entre os corpos de prova com e sem solda se analisados de forma global, porém um ensaio de microtração, isso seria revelado. Contudo, nos ensaios de fadiga dos corpos de prova sem solda observou-se uma maior resistência à fadiga para os aços DOGAL800 e ZSTE380 em relação ao ZAR230. Após o processo de soldagem, os aços ARBL apresentam uma significativa redução da resistência a fadiga, estando abaixo da resistência à fadiga do ZAR230 para ensaios acima de um milhão de ciclos. Os resultados apresentados são explicados com base na relação entre as características microestruturais e propriedades mecânicas dos aços antes e após a soldagem. / In the present work we investigated the mechanical and microstructural proprieties of the ZSTE380 and DOGAL800 high strength low alloys steels (HSLA), comparing to the conventional ZAR230 steel, before and after welding. The main purpose is to detect possible modifications on these steels during the welding process, and to verify the possibility of replacing the conventional ZAR230 steel by one of the HSLAs. Since HSLA steels possess higher mechanical resistance, they can be used in less robust structures, which reduce the weight of the automobiles, and consequently reduce the emission of pollutant gases. We observed different extensions of the heat-affected zone for the three welded steels, with a higher extension in the DOGAL800 and the smaller extension in the ZAR230. Microstructural analysis revealed austenite grain growth in the heat-affected zone, in relation to the base metal in this region for the steels ZSTE380 and DOGAL800, becoming a remarkable increase of resistance due to martensite transformation. The most remarkable case happened in the DOGAL800, where we observed formation of low carbon martensite in the heat-affected zone, being this a harder phase of the steel, but with low ductility. The microhardness profiles indicated that it did not happen a significant change in hardness of the heat-affected zone of the ZAR230, while for the DOGAL800 it is observed a considerable increase in hardness, corroborating the hypothesis of martensite formation. The yield strength obtained form stress-strain curves didn?t revealed any significant differences between welded and without weld samples, if analyzed in a global way, but in a microtensile test, it would be reveled. The samples without weld submitted to the high-cycle fatigue test presented different fatigue resistance, where the DOGAL800 showed the greatest fatigue resistance, followed by the ZSTE380 and finally the ZAR230. However after the welding process we observed a significant reduction in the fatigue resistance of the HSLA steels, even below the ZAR230 resistance for tests above 1 million cycles. The results were explained relating the microstructure properties and the mechanical properties of the three steels, before and after welding.
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