Flow Stress Curves
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Strain Magnitude Assessed at Rest and During Stress Echocardiography in Patients with Normal Coronary Flow Reserve
Abstract Background Coronary flow and myocardial contractile performance assessed by strain magnitude increase during a dobutamine stress echocardiogram (DSE). Normal coronary flow reserve (CFR) can be attained upon completion of a DSE at age-predicted maximum heart rate (HR) (HRmax = 220 - age)] or submaximal HR [(0.85) HRmax] or before completion (early
International Journal of Cardiovascular Sciences. Publicado em: 2022
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2. Amplitude-Dependent Internal Friction Study of Fatigue Deterioration in Carbon Fiber Reinforced Plastic Laminates
The amplitude-dependent internal friction in carbon fiber reinforced plastic (CFRP) laminates subjected to fatigue cycling has been measured and analyzed to convert into the plastic strain of the order of 10-8 as a function of effective stress. The microplastic flow indeed occurs in the stress range three orders of magnitude lower than the failure stress, an
Mat. Res.. Publicado em: 07/06/2018
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3. Analisys of hot deformation behavior of super duplex stainless steel UNS S32760 through processing maps
Abstract The need for materials with higher strength and corrosion resistance in corrosive environments, such as in the oil extraction in saline media, has led to the use of super duplex stainless steels in projects such as the Pre-sal. The manufacture of these materials involves the step of thermomechanical processing, whose performance depends on the worka
Rem: Rev. Esc. Minas. Publicado em: 2016-06
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4. Estudo do comportamento termomecânico do aço API 5L X80 microligado ao Nb-Ti através de ensaios de torção a quente
AbstractThe controlled rolling of high strength low alloy steel has been widely used in the production of large diameter pipes for the oil and gas industry. The thermo-mechanical control process (TMCP) is used to maximize grain refinement and achieve both higher strength and toughness in the steels. In this sense, API 5L X80 micro-alloyed Nb-Ti steel was sub
Rem: Rev. Esc. Minas. Publicado em: 2015-06
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5. A characterization for the constitutive relationships of 42CrMo high strength steel by Artificial Neural Network and its application in isothermal deformation
In hot working process, the prediction of material constitutive relationship can improve the optimization design process. Recently, the artificial neural network models are considered as a powerful tool to describe the elevated temperature deformation behavior of materials. Based on the experimental data from the isothermal compressions of 42CrMo high streng
Mat. Res.. Publicado em: 05/08/2014
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6. Extrusion-shear of AZ31 alloy billets with low temperature and high speed by using three-dimensional finite element modeling and experiments
A new kind of compound extrusion technology including direct extrusion and shears for AZ31 magnesium billets can cause plastic large deformations and high strain rates. A series of compressive tests have been done to obtain the stress-strain curves of AZ31 magnesium alloy. Three-dimensional (3D) thermo-mechanical coupled finite element modeling of forming ma
Mat. Res.. Publicado em: 28/07/2014
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7. The flow behavior modeling of as-extruded 3Cr20Ni10W2 austenitic heat-resistant alloy at elevated temperatures considering the effect of strain
In order to investigate the compressive deformation behavior of 3Cr20Ni10W2 alloy, a series of isothermal upsetting experiments were carried out in the temperature range of 1203-1403 K and strain rate range of 0.01-10 s-1 on a Gleeble-1500 thermo-mechanical simulator. The results indicate that the flow stress initially increases to a peak value and then decr
Mat. Res.. Publicado em: 18/02/2014
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8. Prediction of hot flow plastic curves of ISO 5832-9 steel used as orthopedic implants
An austenitic stainless steel ISO 5832-9 used as a biomaterial was torsion-deformed over the temperature range of 1000-1200 °C and strain rates of 0.05, 0.1, 1.0 and 5.0 s- 1. The flow stress curves obtained showed two regions where firstly there is a rising on stress characterized as work hardening mechanism acting and secondly a decreasing in work-softeni
Mat. Res.. Publicado em: 24/01/2014
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9. Tensile properties of duplex UNS S32205 and lean duplex UNS S32304 steels and the influence of short duration 475 ºC aging
Duplex stainless steels are high strength and corrosion resistant steels extensively used in the petrochemical and chemical industries. The aging at 475 ºC for long periods of time provokes embrittlement and deterioration of corrosion resistance. However, short duration aging at 475 ºC may be used as heat treatment to improve mechanical resistance with sma
Mat. Res.. Publicado em: 13/09/2012
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10. Microextrusão de peças aplicadas a materiais ferrosos e não ferrosos
This thesis presents the study about microforming, in this case microextrusion of the four different materials, an SAE 1020 steel, an AISI 304 stainless steel, an AA6531 aluminum and a C34000 brass. To evaluate the size effect about microextrusion process, two sizes of specimens were used, with a ¿ 4 mm and another with ¿ 1 mm. For each size of specimen, t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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11. Análise da influência de parâmetros do processo de trefilação de barras cilíndricas de aço AISI 1045 via simulação numérica computacional / Title: parameters analysis of the drawing of AISI 1045 steel rods via FEM
This paper aims to analyze the drawing process using simulation and evaluate the influence of process variables such as lubricant (friction coefficient) and angle of die as well as verify the effectiveness of simulation to preview the drawing force, temperature and residual stresses. Experimental work was carried out involving the determination of friction c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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12. Dynamic and steady: shear rheological properties of xanthan and guar gums dispersed in yellow passion fruit pulp (Passiflora edulis f. flavicarpa)
Yellow passion fruit pulp is unstable, presenting phase separation that can be avoided by the addition of hydrocolloids. For this purpose, xanthan and guar gum [0.3, 0.7 and 1.0% (w/w)] were added to yellow passion fruit pulp and the changes in the dynamic and steady - shear rheological behavior evaluated. Xanthan dispersions showed a more pronounced pseudop
Brazilian Journal of Chemical Engineering. Publicado em: 2011-09