Equal Channel
Mostrando 1-12 de 205 artigos, teses e dissertações.
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1. Can International Organisations Be Democratic? A Reassessment
Resumo Este artigo defende uma abordagem conceitual para as OIs como poliarquias globais. Nosso argumento é duplo: em termos teóricos, OIs frequentemente atendem ao critério de coerência filosófica uma vez que suas estruturas são baseadas em regras de filiação e tomada de decisão que são compatíveis com aquelas encontradas em instituições democr
Contexto int.. Publicado em: 02/12/2019
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2. Microstructural Characterization and Evaluation of the Thermomechanical Behavior of an Al 7075-T651 Alloy Deformed by Two Passes of ECAP
Billets of an Al 7075-T651 alloy were processed by two passes of equal channel angular pressing, ECAP, by following route A. First pass was performed at 180°C and the second one in the temperatures 130 and 180°C. The resulting microstructures were characterized by optical microscopy, OM, and scanning electron microscopy, SEM. Also, material macroscopic mec
Mat. Res.. Publicado em: 17/11/2017
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3. Dislocation Density and Texture in Copper Deformed by Cold Rolling and Ecap
Analysis of dislocation density in metallic materials has been pursued with great interest for many years because dislocations are closely associated with plastic deformation and thus exert a deep effect on the mechanical properties of any material. Crystallographic texture has also a decisive influence in some properties. In this work, the dislocation densi
Mat. Res.. Publicado em: 23/10/2017
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4. Microstructural Stability of a Niobium Single Crystal Deformed by Equal Channel Angular Pressing
A [211]-oriented niobium single crystal was deformed by equal channel angular pressing (ECAP) at room temperature using the route Bc to a total strain of 9.2. A sharp cube texture develops after ECAP processing. The deformed samples were annealed in vacuum from 400ºC (673 K) to 900ºC (1173 K) for 1 h to evaluate their microstructural stability. Scanning el
Mat. Res.. Publicado em: 13/07/2017
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5. Mechanical and microstructural behavior evolution of non-ferrous metals by ECASD
ABSTRACT In this study, Equal-Channel Angular Sheet Drawing- ECASD with a die set at 135° was used to produce plastic deformation onto an aluminum alloy AA-1100-O and a magnesium alloy AZ31-O samples, expecting a decreasing the grain size in order to increase the plasticity of these alloys under certain specific working conditions. In this study, the micros
Matéria (Rio J.). Publicado em: 02/05/2017
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6. Applicability of Artificial Neural Network and Nonlinear Regression to Predict Mechanical Properties of Equal Channel Angular Rolled Al5083 Sheets
Abstract Equal channel angular rolling (ECAR) is a severe plastic deformation (SPD) process in order to achieve ultrafine-grained (UFG) structure. In this paper, the mechanical properties of ECAR process using artificial neural network (ANN) and nonlinear regression have been illustrated. For this purpose, a multilayer perceptron (MLP) based feed-forward ANN
Lat. Am. j. solids struct.. Publicado em: 2016-08
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7. An Investigation on the Deformation Heating in Billet and Die During Equal-Channel Angular Pressing and High-Pressure Torsion
This work aims to investigate the temperature rise in Aluminum alloy 6061 due to deformation heating in equal channel angular pressing (ECAP) and high-pressure torsion (HPT) processes using finite element method. The roles of various parameters are investigated and the heating of ECAP die due to billet deformation is included in the simulations. The results
Mat. Res.. Publicado em: 19/04/2016
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8. CFD 2D Description of Local Flow of Polymer Workpiece through a modified U-Shaped Die During Equal Channel Multiple Angular Extrusion
The present article is focused on a 2D computational fluid mechanics study of local viscous flow dynamics and the formation character of rotary modes of deformation during Equal Channel Multiple Angular Extrusion (ECMAE) of a polymer workpiece fluid model through a U-shaped die with parallel slants in channel intersection zones. The present local flow proble
Mat. Res.. Publicado em: 08/04/2016
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9. Dislocation Density by X-ray Diffraction in α Brass Deformed by Rolling and ECAE
Dislocations are responsible for most aspects of plastic deformation in metals. In this work, the dislocation density, ρ, in brass was estimated after different deformation processes via line broadening of X-ray diffractograms using the Convolutional Multiple Whole Profile Program (CMWP) and by Transmission Electron Microscopy (TEM). In addition, we attempt
Mat. Res.. Publicado em: 23/10/2015
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10. Two-parameter Rigid Block Approach to Upper Bound Analysis of Equal Channel Angular Extrusion Through a Segal 2θ-die
This article deals with a phenomenological description of experimentally determined complex geometric shape of material dead zone during Equal Channel Angular Extrusion (ECAE) through a Segal 2θ-die with a channel intersection angle of 2θ>0°and 2θ<180°. Taking into account the complex dead zone geometry in a 2θ-die, a two-parameter Rigid Block Method (
Mat. Res.. Publicado em: 2015-06
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11. On The Limits of Free Speech: Towards the Fair Value of Communicative Liberties
This study addresses, from a theoretically oriented perspective, the relationship between freedom of expression and democracy, trying to assess its implications for the regulation of mass media. Starting with a legal case in which a TV channel and a journalist were prosecuted for hate speech, looking at the reaction of the São Paulo Press Association to the
Bras. Political Sci. Rev.. Publicado em: 2015-04
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12. Local/Distortional/Global buckling mode interaction on thin walled lipped channel columns
The buckling behaviour of pin ended cold-formed steel lipped channel columns affected by local / distortional / global buckling mode interaction under axial loading is simulated by using finite element software ABAQUS, and the results are compared with the test results available in the literature. The comparisons show that the proper analysis model can simul
Lat. Am. j. solids struct.. Publicado em: 2014-12