Flow Stress Curves
Mostrando 13-24 de 27 artigos, teses e dissertações.
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13. Drag reduction by polyethylene glycol in the tail arterial bed of normotensive and hypertensive rats
This study was designed to evaluate the effect of drag reducer polymers (DRP) on arteries from normotensive (Wistar) and spontaneously hypertensive rats (SHR). Polyethylene glycol (PEG 4000 at 5000 ppm) was perfused in the tail arterial bed with (E+) and without endothelium (E-) from male, adult Wistar (N = 14) and SHR (N = 13) animals under basal conditions
Brazilian Journal of Medical and Biological Research. Publicado em: 2011-08
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14. Rheological analysis of water clay compositions in order to investigate mudflows developing in canals
This paper describes the physical and rheological property mixtures of water and kaolinitic clay that form the interstitial fluid found in muds from inundations or torrential lava. Several compositions with varying volume concentrations (Cv) were tested in a high-precision R/S rheometer (shear rate x shear stress). The rheometric parameters such as critical
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-03
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15. Estudo da recristalização dinâmica do aço inoxidável austenítico F 138, utilizado em próteses ortopédicas
In order to analyze the microstructure and to know the dynamic softening mechanics that take place during the hot work in F 138 stainless steel, physical simulation was carried out through continuous isothermal hot torsion tests in a wide range of temperatures and strain rates, covering the real conditions of processing used in the manufacture of orthopedic
Publicado em: 2009
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16. A influência das características da areia artificialmente britada nas propriedades do estado fresco do concreto
This work reports on the properties of the fresh state of concrete when different petrografic types of crushed sand are used. It focuses on the characteristics of these aggregates which exert a dominant influence on the concrete properties. To reach the main goal of this work, five different lithological types of crushed sand were used, which have been ident
Publicado em: 2008
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17. Parâmetros de resistência do solo para dimensionamento de sistemas de drenagem em estradas não pavimentadas / Parameters of soil resistance for drainage systems dimensioning in non-paved roads
This work was developed mainly aiming the determination of the erodibility and the critical shear stress in non-paved roads, focusing on the reduction of the eminent risks of occurring erosion in these roads, based upon a drainage system dimensioning using local resistance values. In order to achieve these values a yield simulator was built, which model cons
Publicado em: 2008
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18. Prediction of steel flow stresses under hot working conditions
An austenitic stainless steel was deformed in torsion over a temperature range of 900-1200 °C using strain rates of 1, 5 and 10 s-1. The stress vs. strain curves determined were corrected for deformation heating and the flow stress was found to rise in the initial work-hardening regime, reaching a maximum before dropping to the steady state due to softening
Materials Research. Publicado em: 2005-09
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19. Influencia do tamanho de particulas no comportamento reologico da polpa de jabuticaba. / The influence of particles size on rheological behavior of jaboticaba pulp.
The influence of particle size on rheological behavior of jaboticaba pulp was evaluated in this study. Particle size distribution (PSD) of the pulp was evaluated using laser diffraction, which showed a monomodal distribution with mean diameter close to 330um. Jaboticaba pulp was centrifuged for serum separation. Particles were then separated through wet siev
Publicado em: 2005
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20. Influence of deformation on the kinetics of phase transformation in a forging steel during warm working
Dilatometric techniques were used to determine the start and finish transformation heating temperatures for a carbon steel (0.30% C - 1.5% Mn). The mechanical behavior of the steel was measured by torsion testing in the temperature range of 700 to 820 °C with holding times ranging from 1 to 30 min. The flow stress curves presented different shapes and stres
Materials Research. Publicado em: 2004-06
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21. Construção e testes de máquina de ensaio de torção plástica para levantamento do comportamento plástico de metais
A computerized prototype machine for cold torsion testing has been developed, constructed and tested in the Laboratory of Metal Forming at UDESC (University the State the Santa Catarina) - Joinville. The equipment consists of a horizontal torsion machine, employing an electric motor, a wheel, a horizontal axle and a control and acquisition data system. The g
Publicado em: 2004
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22. Conservação da polpa de açai atraves da tecnologia de obstaculos e caracterização reologica
The objective of this study was to improve the preservation process of the assai pulp through the application of obstacles technology in milder conditions that the ones applied by Carneiro (2000) and to extend the knowledge on rheological behavior of the assai pulp. In the application of the obstacles technology, the following preservation factors were used:
Publicado em: 2002
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23. Effect of rheological properties of zircon-alumina suspensions on density of green casts
Rheological properties of aqueous suspensions (48 vol%) of zircon-alumina mixtures containing different amounts of polyelectrolyte as dispersant were studied. Slip casting in a plaster mold and pressure filtration at 8 MPa experiments were performed to correlate the rheological properties of the suspensions with the relative density of green casts. Flow curv
Materials Research. Publicado em: 2001-10
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24. Plastic behavior of medium carbon vanadium microalloyed steel at temperatures near gamma <-> alpha transformation
Dilatometric techniques were used to build the continuous cooling transformation (CCT) diagram for a medium carbon microalloyed steel; the microstructure and hardness were determined at different cooling rates. The mechanical behavior of the steel in the austenite field and at temperatures approaching austenite to ferrite transformation was measured by means
Materials Research. Publicado em: 2001-07