Friction Models
Mostrando 13-24 de 49 artigos, teses e dissertações.
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13. Influência de variáveis de compactação na estrutura dos solos: caracterizações geotécnica, química, mineralógica e microestrutural / Influence of laboratory compaction variables in soils structure: geotechnical, chemical, mineralogical and microstructural characterizations
This research addressed the effect of laboratory methods of static and dynamic compaction on compaction parameters, mechanical strength and compressibility of three gneiss residual soils (two young and one mature soils) and two granite residual soils (one young and one mature soils) from the Minas Gerais State, Brazil. Disturbed soils samples were collected,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/12/2010
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14. Analysis of numerically simulated true strain on high stampability sheets
The sheet metal forming is a manufacturing process widely used industrially. The quality and efficiency of the process is dependent on the correct choice of the process parameters and the correct understanding of the sheet metal behavior. The identification of the regions where stretching and/or deep drawing occurred during the forming process can aid the pr
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-03
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15. Effects of microstructure on the fatigue crack growth behavior of light metals and design considerations
Fatigue crack growth mechanisms of long and small cracks were investigated in cast and wrought aluminum and titanium alloys with various microstructures (as-cast A535, 6061-T61, and mill-and beta annealed Ti-6Al-4V). In addition, friction stir welded and cold spray processed 6061-T61 were also investigated. The effects of microstructure on the fatigue crack
Matéria (Rio de Janeiro). Publicado em: 2010
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16. Nonlinear process identification and friction quantification in control valves. / Identificação de processos não-lineares e quantificação de atrito em válvulas de controle.
The friction in control valves and inadequate controller tuning are two of the major sources of performance degradation in control loops that include such devices. As friction models are needed to diagnose abnormal valve operation or to compensate such undesirable effects, process models play an essential role in controller design. This work extends existing
Publicado em: 2009
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17. Análise de um sistema de lajes mistas considerando a influência do atrito dos apoios e a avaliação do momento de inércia efetivo
The aim of this work is to evaluate the behavior and strength of composite slabs considering a rigorous analysis for determination of composite slabs effective moment of inertia (Ilm) and the influence of the friction of the region of the supports. The results of a program of laboratory tests, carried through by RODRIGUES &LAVALL (2005), considering the Stee
Publicado em: 2009
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18. Considerações sobre o atrito para processos de forjamento a frio através do ensaio de compressão do anel
São realizadas análises teóricas e experimentais do atrito nos processos de forjamento a frio, através do ensaio de compressão do anel. Os modelos de atrito de Amonton-Coulomb (μ), atrito interfacial (m) e de Levanov (f) são investigados com auxílio de softwares comerciais de simulação de processos de forjamento. Diferentes condições de lubrifica
Publicado em: 2009
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19. Devir-velho: um envelhecer para além dos modelos
This work resulted from a study based on the ideas of the philosophers Seneca and Espinosa permeated by Deleuze. The main objective of the research was to identify and analyze some of the philosophies expressed in these building approaches in order to compose a new perspective on aging and being old. The pursuit of these meetings is justified by the current
Publicado em: 2009
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20. Avaliação da perda de carga e do fator de atrito no escoamento de fluidos de perfuração em geometrias circular e anulares concêntricos / Load loss and friction factor in the disposal of drilling fluids in circular geometry and concentric rings
The constant search for new technologies of drilling oil wells has reinforced the research and development of drilling fluids and the specific study of their disposal, particularly with regard to the load loss caused by the different geometries. Within this context, this study focused on the load loss and friction factor in the disposal of the drilling fluid
Publicado em: 2008
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21. Análise experimental de bloco de fundação sobre duas estacas, sob carga centrada, para estruturas pré-fabricadas
This work analyses and discusses the pile caps behavior for concrete precast structures on two piles submitted to the action of centered force. As column-foundation connection, rough interface foundation socket was used. The strut-and-tie model is used to shape the effort transmission from the column to the pile-caps, confirmed by the experimental analyses.
Publicado em: 2008
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22. Resposta sísmica de edifícios com sistemas de isolamento de base
This dissertation work presents a comparative study of parameters that control the effectiveness of the main base isolation systems used in the building protection under a seismic excitation. Also, it is availed the efficient of parameter as: friction coefficient, isolator period, damping coefficient, structural stiffness, and structural period by means of c
Publicado em: 2008
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23. Numerical and experimental analysis of the residual stresses induced by shot peening in automotive springs. / Análise numérico-experimental das tensões residuais induzidas por jateamento com granalha em molas automotivas.
The shot peening is a cold-working mechanical process where a stream of tiny small balls is impelled against the surface of components. Each impact causes plastic deformation and introduces compressive residual stresses on the surface, which consequently increases their resistance to fatigue. This process is widely used in the automotive industry, particular
Publicado em: 2008
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24. Estudo da fluidodinâmica e da secagem de um secador rotatório da indústria de fertilizantes
The dimensioning, the modeling and the simulation of the rotary dryers constitutes a big challenge. The drying involves mass and heat transfer, and fluid dynamics processes of the most different forms. Great part of the dryers projects are done according to empiricism and based on the experience of engineers and on the scale-up of prototypes. The purpose of
Publicado em: 2008