Дисертації з теми "Steel castings Mathematical models"
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Spinelli, Jose Eduardo. "Simulação do lingotamento continuo de tiras finas de aços." [s.n.], 2000. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264701.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
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Resumo: Entende-se por modelagem de processo, o desenvolvimento de uma representação quantitativa ou qualitativa dos fenômenos físicos associados ao processo. Neste trabalho são realizadas simulações do processo twin roll de lingotamento contínuo de tiras de aços, utilizando como referência tecnológica o equipamento piloto instalado nas dependências do Instituto de Pesquisas Tecnológicas do Estado de São Paulo. São construídos dois simuladores para o processo: um simulador da solidificação unidirecional, com molde refrigerado de aço e paredes laterais de material refratário, utilizando-se o aço inoxidável 304 como material de simulação; e variando-se as temperaturas de vazamento; e outro simulador a frio, com componentes feitos de acrílico, água como fluido de simulação e permanganato de potássio como corante. Um modelo matemático previamente desenvolvido é utilizado para confrontar perfis térmicos teóricos com perfis experimentais, para a determinação do coeficiente de transferência de calor metal/molde. O levantamento de valores de espaçamento dendrítico secundário é realizado nas amostras, além da observação simultânea das estruturas de solidificação, o que comprovou a eficiência do simulador em caracterizar o processo de solidificação do equipamento piloto. O uso do modelo frio permitiu a caracterização do posicionamento de barreira a 15 cm ou a 20 cm da lateral esquerda do distribuidor como a melhor configuração
Abstract: It can be understood by process modeling the development of a quantitative or qualitative representation of the physical phenomena associated to the process. In this work, simulations concerning the twin roll continuous caster of steels process at IPT (Instituto de Pesquisas Tecnológicas do Estado de São Paulo) are performed. Two simulators were developed: (i) a simulator of unidirectional solidification with cooled steel mold and refractory lateral walls, by using a stainless steel as the reference metal (AISI 304), and varying superheat temperatures; (ii) a physical model, with components made of acrylic, water as the simulation fluid and potassium permanganate as a pigment. A previously developed mathematical model has been used to determine the metal/mold heat transfer coefficient by a method that compares experimenta1ltheoretical temperature curves. Measurement of secondary dendrite arm spacings is performed by microestructural examination of the samples, confirming the simulator efficiency in characterizing the solidification process in the pilot equipment. The use of the physical model has permitted to attain the best configuration for the tundish, by positioning the dam 15 cm or 20 cm from the left side of tundish
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
Moosbrugger, John C. "Numerical computation of metal/mold boundary heat flux in sand castings using a finite element enthalpy model." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/16365.
Повний текст джерелаRees, C. S. "Mathematical models in an integrated steel making plant." Thesis, University of Hull, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383736.
Повний текст джерелаSierra, Robinson. "Investigation of the mechanical behaviour of TRIP steels using FEM." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99793.
Повний текст джерелаMahmoody, Sam. "Micromechancal modeling of dual-phase steel using a rate-dependent crystal plasticity model." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99778.
Повний текст джерелаWarke, Virendra S. "Removal of Hydrogen and Solid Particles from Molten Aluminum Alloys in the Rotating Impeller Degasser: Mathematical Models and Computer Simulations." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0626103-111317.
Повний текст джерелаThomas, Brian Gordon. "Investigation of panel crack formation in steel ingots using mathematical and physical models." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25980.
Повний текст джерелаApplied Science, Faculty of
Mining Engineering, Keevil Institute of
Graduate
Choi, Joonho. "Concurrent fire dynamic models and thermomechanical analysis of steel and concrete structures." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26679.
Повний текст джерелаUslu, Cafer Harun. "3-d Finite Element Analysis Of Semi-rigid Steel Connections." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610835/index.pdf.
Повний текст джерелаZhou, Li. "Machining chip-breaking prediction with grooved inserts in steel turning." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-0109102-140803.
Повний текст джерелаPatra, Anirban. "Modeling the mechanical behavior and deformed microstructure of irradiated BCC materials using continuum crystal plasticity." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50366.
Повний текст джерелаNassiri, Esmail. "Modelling nonlinear behaviour of two-dimensional steel structures subjected to cyclic loading." Thesis, Queensland University of Technology, 1998.
Знайти повний текст джерелаKahle, Matthew Gilbert. "Partially restrained composite connections : design and analysis of a prototype structure." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/20830.
Повний текст джерелаGarcia, Victor Hugo Guzzo. "Modelagem computacional da corrosão por pites em aço inoxidável: efeito do potencial e de inclusões de MnS." Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=1243.
Повний текст джерелаIn this work is presented a computational routine to model pitting corrosion of stainless steel based on pre-existing mathematical models that take into account deterministics and stochastic effects. As contribution, modifications based on experimental results were inserted, evaluating the influence of MnS inclusions on metal surface, a typical site of major pitting nucleation. Applied potential effect was modeled, thus, it was possible to verify its influence on pitting formation and the possible range of pitting. The model consists on spatio-temporal evaluating of nucleation process, with visualization of metastable and stable pitting evolution and the anodic current transient. The results are presented in terms of variables with greatest influence on the susceptibility of pitting formation, such as concentration of aggressive species, passivity layer damage and ohmic potential drop, allowing future studies to obtains more efficient ways to combat pitting corrosion
Oliveira, Willian Rafael de. "INFLUÊNCIA DOS PARÂMETROS DE IMPLANTAÇÃO IÔNICA POR IMERSÃO EM PLASMA NA EFICIÊNCIA DA NITRETAÇÃO DO AÇO INOXIDÁVEL SUPER DUPLEX." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2016. http://tede2.uepg.br/jspui/handle/prefix/858.
Повний текст джерелаThis work aimed at study the correlation of variables in a plasma immersion ion implantation (PIII) system, as well as their synergistic combination for the nitriding of the UNS S32750 super duplex stainless steel ( SD 2507). The research comprised two phases, as follows. (i) Study of the system. The interconnection of variables, namely voltage (V), pulse width (L), frequency (f) and current (I), were systematically analyzed with respect to the cathode heating. A mathematical formulation was proposed for the ion average energy and the substrate temperature, which took into consideration the energy conservation in the system, and the basic theories for plasma and sheaths and the ion interaction with matter. Hereafter, such model is thought to be experimentally demonstrated, allowing inferring the actual PIII fraction of energy that is converted to heat. (ii) N-PIII of the SD. Mirror-like samples were nitrided under different V, f and L combinations, leading to the temperatures 295, 325, 355 and 400 oC. The surface characterization methods were the optical, field emission electron, and atomic force microscopies, X-ray diffraction, energy dispersive X-ray spectroscopy, backscattered electron diffraction, and instrumented indentation. The austenite and ferrite fraction in the as received material amounted to 43,7 % and 56,3 %, respectively. After nitriding, the modified layers were 0,5-1,5 m thick. Up to 355 ºC, the expanded phase N was produced in originally austenite grains, whereas Fe2-3N e Fe4N precipitates were formed in ferrite grains. The hardness profiles were similar among different temperatures and between the two phases in the same sample. However, in ferritic regions, the mechanism for plastic deformation changed from ductile to brittle. In the 400 ºC treatments, only N was formed. Finally, a correlation for the production of the expanded phase in PIII and the mean pulse energy Ei was attained, given by and . Where IN and I are the integrated intensities of diffraction peaks for austenite and expanded austenite, respectively.
O objetivo deste trabalho foi estudar o comportamento de um sistema de implantação iônica por imersão em plasma (PIII: “plasma immersion ion implantation”), em função de suas variáveis, bem como a influência destas na nitretação de superfícies do aço super duplex UNS S32750 (ou SD 2507). O trabalho foi dividido em dois momentos, como segue. (i) Estudo do sistema. O comportamento das variáveis associadas à implantação iônica, especificamente tensão (V), largura de pulsos (L), frequência (f) e corrente (I), foi sistematicamente analisado com relação ao aquecimento do cátodo. Com base na conservação de energia, física de plasmas e bainhas catódicas e interação de íons com a matéria, propôs-se uma formulação matemática relacionado a energia média dos íons à temperatura do substrato, a qual poderá, futuramente, ser posta à prova experimental, mensurando-se a fração de energia que é, de fato, transformada em calor. (ii) Nitretação por PIII do SD. Amostras com superfície especular foram nitretadas sob diferentes combinações de V, f e L, em temperaturas de 295, 325, 355 e 400 oC. As superfícies foram caracterizadas por métodos de microscopia (ótica, eletrônica com efeito de campo, de força atômica), difração de raios X, espectroscopia de raios X por energia dispersiva, difração de elétrons retroespalhados, e indentação instrumentada. O SD apresenta estrutura cristalina de austenita e ferrita na proporção de 43,7/56,3. A nitretação produziu camadas modificadas com espessura de 0,5 a 1,5 m. Observou-se, nos tratamentos até 355 ºC, a formação da fase expandida N nos grãos que originalmente eram austenita, e de precipitados de nitretos -Fe2-3N e -Fe4N em grãos de ferrita. Embora não houve diferenças significativas nos perfis de dureza, tanto entre as temperaturas quanto entre as fases em uma mesma amostra, o mecanismo de deformação plástica nas regiões ferríticas transitou de dúctil para frágil. Nas nitretações em 400 ºC, houve apenas a formação de N. Finalmente, determinou-se que a obtenção da fase expandida por PIII no SD se relaciona com a energia média por pulso Ei por e . Onde I e I são as intensidades integradas dos picos de difração da austenita expandida e da austenita, respectivamente.
Fan, Chih-Ming, and 范志銘. "Application of Mathematical Model and Physical Model in Ladle Refining and Continuous Casting Processes of Steel." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/96636553685563930792.
Повний текст джерела國立成功大學
材料科學及工程學系碩博士班
91
The purpose of this study is to develop two mathematical models, which are based on a computational fluid dynamics technique, named SOLA, and the k-ε two-equation turbulence model, to analyze the fluid flow phenomena of molten steel in the ladle during the secondary refining process and the tundish operation in the continuous casting process of steel. The first mathematical model is used to analyze the fluid flow phenomena and the corresponding diffusion of the injected Ca-Si under various design and operating conditions to find the optimal Ca-Si injection position. The second mathematical model is used to analyze fluid flow phenomena and design the optimal flow control device during initial casting operation, steady state operation and ladle-interchange operation. Several physical models are also constructed in this study. Water model experiments are conducted to verify the accuracy and reliability of the mathematical models. Good agreements are observed between the simulations and measurements. As the mathematical model is verified to be a trustworthy tool, it is then applied to the actual operation to simulate the fluid flow; heat transfer and mass transfer phenomena of the secondary refining and continuous casting processes. The flow pattern of two-phase flow in the stirred ladle for the secondary refining is simulated. The results show that the injection position of D, which has the coordinate of , has the shortest mixing time. The simulated results for the actual ladle operation show the similar trend to the water model. For the injection positions on the tuyere/circle center plane, the additives prematurely float to the top as the injection positions are near the plume zone. It helps the additives to transport to the bottom as the injection positions are away from the plume zone. The simulated results for the actual ladle operation show that the optimal positions for injection are located on the tuyere/circle-center plane, opposite side of the tuyere, and 0.5-0.8 r away from the circle center. For these injection positions, the mixing time is shorter and the flow pattern favors the transport of the additive to the bottom of the ladle. The fluid flow and heat transfer phenomena of the molten steel in the tundish during its filling stage and subsequent initial casting operation are studied. The results show that the temperature field in LP-ND operation is not uniform Inclusion distribution and the extents of inclusion contamination among the outlets of the various strands in the tundish are also analyzed. The left half of tundish, inclusion contamination in the #2 strand is significantly more severe then that in the #1 strand. This is confirmed by the actual experience on the shop floor of that particular billet caster that the #2 strand experiences more difficulty in clogging problem during the initial casting operation than the #1 strand does. The LP-SD has no eddy near outlet strand and has more uniform temperature field. It shows that LP-SD lowers nozzle clogging and makes distribution of steel more uniform. The fluid flow and mass transfer phenomena of the molten steel in the three different tundish caster during steady state are studied. Three tundish caster include A-shaped four strands billet tundish, twin strand billet tundish, and single strands slab tundish. In A-shaped four strands billet tundish, HP-SB reduces the difference of residence times between two strands, and makes distribution of steel more uniform. In twin strands billet tundish, the billet tundish with the HLPP design has the longest min-RT and it can inhibit turbulence as well as guide flow upward along slag/metal interface in the tundish. It is thus considered that HLPP arrangement is the optimal SEFCD design for twin strands billet tundish. In the single strand slab tundish, the result shows that the plain tundish has short circuit and the lowest inclusion removal ratio. The tundish with PP can reduce short circuit and has the highest inclusion removal ratio, even for inclusions, which is smaller than 50 μm. PP is the optimal SEFCD design for the single strand slab tundish. The fluid flow and mass transfer phenomena of the molten steel in the tundish caster during ladle-change period are also studied. The results show that the weir and slanting dam reduce the velocity of steel and lower the chance for slag particles to flow into the outlet. WSLD40-F120 has the smallest number of slag particles to flow into the outlet and is considered the optimal flow control design in the T-shaped single strand slab tundish caster.
Yeh, Jiunn-Lin, and 葉俊麟. "The Development of A Mathematical Model and Its Application in the Design/Operation of Tundishes for the Continuous Casting of Steel Slab." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/19515081379711814706.
Повний текст джерелаDePiero, Anthony H. "High cycle fatigue modeling and analysis for deck floor truss connection details." Thesis, 1997. http://hdl.handle.net/1957/33707.
Повний текст джерелаGraduation date: 1998
Jheng, Yi-Jhen, and 鄭亦真. "The development and performance analysis of the mathematical programming models for the steel production." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/85535804964061505506.
Повний текст джерела國立聯合大學
管理研究所
96
This paper proposes the integrated programming model and the two-stage programming model for solving the production scheduling problem for steel process with the objective to minimize the total inventory, in which the demands of all product specification should be satisfied. The integrated model simultaneously solve the combination of some product specifications with corresponding available cutting length of steel slab and solve the producing quantity of each combination of product specifications. However, the two-stage programming model solves these two categorical variables by two related models iteratively and including predefined rules from experiences to reduce the complexity. A performance comparison basing on actual customer orders for these models is also provided.
Liang, Bin. "Estimation of Time-dependent Reliability of Suspension Bridge Cables." Thesis, 2016. https://doi.org/10.7916/D8V69JTN.
Повний текст джерелаSabapathy, Prakash Niranjan. "Predicting weld cooling rates and the onset of failure during in-service welding / Prakash N. Sabapathy." 2002. http://hdl.handle.net/2440/22043.
Повний текст джерелаIncludes bibliographical references (leaves 265-273)
xi, 273 leaves : ill. (some col.), plates (col.) ; 30 cm.
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
Concerns the specialized requirements of welding procedures used on operational gas pipelines.
Thesis (Ph.D.)--University of Adelaide, Dept. of Mechanical Engineering, 2004?
Sabapathy, Prakash Niranjan. "Predicting weld cooling rates and the onset of failure during in-service welding / Prakash N. Sabapathy." Thesis, 2002. http://hdl.handle.net/2440/22043.
Повний текст джерелаIncludes bibliographical references (leaves 265-273)
xi, 273 leaves : ill. (some col.), plates (col.) ; 30 cm.
Concerns the specialized requirements of welding procedures used on operational gas pipelines.
Thesis (Ph.D.)--University of Adelaide, Dept. of Mechanical Engineering, 2004?
Mursi, Mohanad Civil & Environmental Engineering Faculty of Engineering UNSW. "The behaviour and design of thin walled concrete filled steel box columns." 2007. http://handle.unsw.edu.au/1959.4/40494.
Повний текст джерелаKaranci, Efe. "Modeling Corrosion in Suspension Bridge Main Cables." Thesis, 2017. https://doi.org/10.7916/D8RB7H05.
Повний текст джерелаChen, Quan 1977. "Effects of thermal loads on Texas steel bridges." 2008. http://hdl.handle.net/2152/17802.
Повний текст джерелаtext
Sokur, M., V. S. Biletskyi, M. Fyk, O. Fyk, and I. Zaselskiy. "The study of the lining layer abrasing wear in the semiautogenous grinding mill." Thesis, 2020. http://repository.kpi.kharkov.ua/handle/KhPI-Press/46212.
Повний текст джерелаSeracino, R. (Rudolf). "Partial-interaction behaviour of composite steel-concrete bridge beams subjected to fatigue loading / by Rudolf Seracino." 1999. http://hdl.handle.net/2440/19519.
Повний текст джерелаxix, 156 leaves : ill. ; 30 cm.
Title page, contents and abstract only. The complete thesis in print form is available from the University Library.
Determines the effect of partial-interaction and interfacial friction on the fatigue behaviour of composite bridge beams and develops a set of design rules for the assessment of the residual strength and performance of composite bridge beams.
Thesis (Ph.D.)--University of Adelaide, Dept. of Civil and Environmental Engineering, 1999
Seracino, R. (Rudolf). "Partial-interaction behaviour of composite steel-concrete bridge beams subjected to fatigue loading / by Rudolf Seracino." Thesis, 1999. http://hdl.handle.net/2440/19519.
Повний текст джерелаxix, 156 leaves : ill. ; 30 cm.
Determines the effect of partial-interaction and interfacial friction on the fatigue behaviour of composite bridge beams and develops a set of design rules for the assessment of the residual strength and performance of composite bridge beams.
Thesis (Ph.D.)--University of Adelaide, Dept. of Civil and Environmental Engineering, 1999
Ahmed, Mizan. "Experimental and Numerical Studies of Concrete-Filled Double Steel Tubular Columns." Thesis, 2020. https://vuir.vu.edu.au/40437/.
Повний текст джерелаKwon, Gun Up 1977. "Strengthening existing steel bridge girders by the use of post-installed shear connectors." 2008. http://hdl.handle.net/2152/18079.
Повний текст джерелаtext
Law, J. R. "Time varying probability of failure of steel floor beams subjected to real fire." Thesis, 1997. https://vuir.vu.edu.au/18185/.
Повний текст джерела