Teori na prática: uma biografia intelectual

Divulgação dos SUMÁRIOS das obras recentemente incorporadas ao acervo da Biblioteca Ministro Oscar Saraiva do STJ. Em respeito à Lei de Direitos Autorais, não disponibilizamos a obra na íntegra.Localização na estante: 342(81) T314n- Coordenado por: Claudio Xavier Seefelder Filho e Daniel Coussirat de Azevedo

Simulation of hot stamping processes

Hot stamping is a thermo-mechanical technique that enables to give to a metallic blank the desired geometry and properties in a single step, where deformation at high temperature, phase transformations and heat transfer are occurring simultaneously and affect mutually. They are several variables controlling the quality of the final component and their relationships are, in some cases, complex. Therefore, a methodology able to take into account all the phenomena involved is necessary in order to understand the influence of the parameters characterising the deformation system. In this work, numerical simulation techniques are implemented as a tool to evaluate the effect of different process parameters in the hot stamping of a Boron steel, with special emphasis on the thermal conductivity of the material of the dies, the cooling system of the tooling and the main features of the contact between metallic blank and tools. A very simple experimental test has been very useful to validate the simulation and to adjust the thermal contact conductance, responsible up to a point for the cooling velocity of the sheet. As a result, the importance of the quality of the thermal contact between the workpiece and tools has to be pointed out. The high thermal conductivity of the material dies allows reducing the duration of the forming cycle. An efficient cooling system limits the maximum temperature in the dies and assures a stable thermal state and consequently, the manufacturing of pieces with a uniform quality in long series is favouredPostprint (published version

Simulation of hot stamping processes

Hot stamping is a thermo-mechanical technique that enables to give to a metallic blank the desired geometry and properties in a single step, where deformation at high temperature, phase transformations and heat transfer are occurring simultaneously and affect mutually. They are several variables controlling the quality of the final component and their relationships are, in some cases, complex. Therefore, a methodology able to take into account all the phenomena involved is necessary in order to understand the influence of the parameters characterising the deformation system. In this work, numerical simulation techniques are implemented as a tool to evaluate the effect of different process parameters in the hot stamping of a Boron steel, with special emphasis on the thermal conductivity of the material of the dies, the cooling system of the tooling and the main features of the contact between metallic blank and tools. A very simple experimental test has been very useful to validate the simulation and to adjust the thermal contact conductance, responsible up to a point for the cooling velocity of the sheet. As a result, the importance of the quality of the thermal contact between the workpiece and tools has to be pointed out. The high thermal conductivity of the material dies allows reducing the duration of the forming cycle. An efficient cooling system limits the maximum temperature in the dies and assures a stable thermal state and consequently, the manufacturing of pieces with a uniform quality in long series is favoure

Bibliographie critique

Eisemann Pierre Michel, Bardonnet Daniel, Bastid-Burdeau Geneviève, Coussirat-Coustère Vincent, Flory Maurice, Pellet Alain, Poulain Michèle, Ruiz-Fabri Hélène, Sorel Jean-Marc, Stern Brigitte, Vignes Daniel-Henri, Weil Prosper. Bibliographie critique. In: Annuaire français de droit international, volume 36, 1990. pp. 1133-1191

Bibliographie critique

Eisemann Pierre Michel, Bardonnet Daniel, Bastid-Burdeau Geneviève, Coussirat-Coustère Vincent, Flory Maurice, Pellet Alain, Poulain Michèle, Ruiz-Fabri Hélène, Sorel Jean-Marc, Stern Brigitte, Vignes Daniel-Henri, Weil Prosper. Bibliographie critique. In: Annuaire français de droit international, volume 36, 1990. pp. 1133-1191

Bibliographie critique

Bastid Suzanne, Pellet Alain, Coussirat-Coustère Vincent, Eisemann Pierre Michel, Bardonnet Daniel, Tran Van Minh , Flory Thiébaut, Reuter Paul, Fornasier Raffaello, Seidl-Hohenveldern Ignaz. Bibliographie critique. In: Annuaire français de droit international, volume 25, 1979. pp. 1038-1103

Bibliographie critique

Bastid Suzanne, Pellet Alain, Coussirat-Coustère Vincent, Eisemann Pierre Michel, Bardonnet Daniel, Tran Van Minh , Flory Thiébaut, Reuter Paul, Fornasier Raffaello, Seidl-Hohenveldern Ignaz. Bibliographie critique. In: Annuaire français de droit international, volume 25, 1979. pp. 1038-1103

Bibliographie critique

Eisemann Pierre Michel, Poulain Michèle, Vignes Daniel-Henri, Grewe Constance, Quéneudec Jean-Pierre, Tavernier Paul, Coussirat-Coustère Vincent, Pellet Alain, R. P., Bretton Philippe. Bibliographie critique. In: Annuaire français de droit international, volume 35, 1989. pp. 995-1047

Localized irregularities in hemoglobin flow and oxygenation in calf muscle in patients with peripheral vascular disease detected with near-infrared spectrophotometry.

PurposeNear-infrared spectrophotometry is used to measure flow, concentration, and oxygenation of hemoglobin in arterioles, capillaries, and venules several centimeters deep in tissue. The purpose of this study was to investigate the distribution of flow, concentration, and oxygenation of hemoglobin in calf muscle in patients with documented peripheral arterial occlusive disease (PVD), patients with risk factors for PVD,and healthy younger subjects at rest.MethodWith a frequency-domain near-infrared spectrophotometer and a specially designed probe, we generated maps at 22 locations simultaneously of hemoglobin flow, concentration, and oxygenation, with the venous occlusion method. Eight legs of 7 patients with diagnosed PVD (PVD group), 10 legs of 8 patients with normal ankle-brachial index but with risk factors for PVD (RF group), and 16 legs of 8 healthy subjects (H group) were studied.ResultsGlobal mean values were significantly (P <.05) different between the three groups for oxygen consumption (PVD group, 0.027 +/- 0.009 mL/100 g/min; RF group, 0.038 +/- 0.017 mL/100 g/min; H group, 0.022 +/- 0.020 mL/100 g/min), venous oxygen saturation (PVD, 59.7% +/- 15.4%; RF, 69.6% +/- 10.5%; H, 80.8% +/- 4.5%), and, at 60 s of venous occlusion, concentration changes in oxyhemoglobin (PVD, 4.48 +/- 3.25 micromol/L; RF, 8.44 +/- 2.33 micromol/L; H, 6.85 +/- 4.57 micromol/L), deoxyhemoglobin (PVD, 3.60 +/- 0.73 micromol/L; RF, 4.39 +/- 1.30 micromol/L; H, 2.36 +/- 1.79 micromol/L), and total hemoglobin (PVD, 8.07 +/- 3.83 micromol/L; RF, 12.83 +/- 2.75 micromol/L; H, 9.21 +/- 6.34 micromol/L). No significant difference was found between the three groups for hemoglobin flow (PVD, 0.92 +/- 0.69 micromol/100 mL/min; RF, 1.68 +/- 0.50 micromol/100 mL/min; H, 1.44 +/- 1.17 micromol/100 mL/min) and blood flow (PVD, 0.45 +/- 0.28 mL/100 g/min; RF, 0.77 +/- 0.21 mL/100 g/min; H, 0.62 +/- 0.50 mL/100 g/min). All parameters featured a distribution dependent on location.ConclusionMean value for venous oxygen saturation was higher in healthy subjects compared to patients with documented PVD. In patients with PVD, areas of lower oxygenation were clearly discernible. At distal locations of calf muscle, significant correlations between reduced hemoglobin flow, venous oxygen saturation, oxyhemoglobin, and total hemoglobin and reduced ankle-brachial index were found. Maps revealed localized irregularities in oxyhemoglobin, total hemoglobin, and venous oxygen saturation in patients with PVD. Near-infrared spectrophotometry is a noninvasive bedside technique that can enable determination of blood flow and oxygenation in tissue and may provide a method for evaluating patients with PVD

Bibliographie critique

Eisemann Pierre Michel, Bastid Suzanne, Bardonnet Daniel, Pellet Alain, Chemillier-Gendreau Monique, Thierry Hubert, Coussirat-Coustère Vincent, Decaux Emmanuel, Vignes Daniel-Henri, Quéneudec Jean-Pierre, Pinto Monica, Arpio Marta, Larger Dominique, Jouve Edmond, Berlia Georges. Bibliographie critique. In: Annuaire français de droit international, volume 33, 1987. pp. 1043-1119