Constitutive equations for elevated temperature flow behavior of commercial purity aluminum

2012 ◽  
Vol 545 ◽  
pp. 61-67 ◽  
Author(s):  
H.R. Rezaei Ashtiani ◽  
M.H. Parsa ◽  
H. Bisadi
Keyword(s):  
Elevated Temperature ◽  
Constitutive Equations ◽  
Flow Behavior ◽  
Commercial Purity ◽  
Commercial Purity Aluminum

Constitutive Equations for Commercial-Purity Aluminum Deformed Under Hot-Working Conditions

1995 ◽  
Vol 117 (1) ◽  
pp. 20-27 ◽  
Author(s):  
E. S. Puchi
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Constitutive Equations ◽  
Stress Sensitivity ◽  
Hot Working ◽  
Commercial Purity ◽  
Rational Analysis ◽  
Exponential Relationship ◽  
Exponential Factor ◽  
Commercial Purity Aluminum

A rational analysis of a number of stress-strain curves for a commercial-purity aluminum has been carried out in order to derive a set of constitutive equations capable of describing the flow stress of the material in terms of the applied strain, rate of straining, and deformation temperature. Such an analysis combines the exponential saturation strain-hardening function earlier proposed by Voce (1948; 1955) with the exponential relationship developed from steady-state creep data at high stresses, and considers the existence of two different regimes of work-hardening. The proposed formalism requires only the use of seven material constants which include the temperature-dependent shear modulus, the activation energy for self-diffusion, one pre-exponential factor, and four stress sensitivity parameters of the strain rate. A satisfactory correlation has been obtained between the experimental values of the flow stress and those predicted for the model, which enables it to be used in conjunction with any algorithm based on finite differences methods or finite elements codes to simulate hot-working operations carried out in this material.

High-Temperature Mechanical Properties and Constitutive Modelling of Ti6Al4V Sheets

2016 ◽  
Vol 879 ◽  
pp. 2020-2025 ◽  
Author(s):  
Beatrice Valoppi ◽  
Stefania Bruschi ◽  
Andrea Ghiotti
Keyword(s):  
Elevated Temperature ◽  
Strain Rate ◽  
Flow Behavior ◽  
Hot Stamping ◽  
Tensile Tests ◽  
Testing Temperature ◽  
Constitutive Modelling ◽  
Arrhenius Model ◽  
High Temperature Mechanical Properties ◽  
Material Texture

In this paper, tensile tests were performed at elevated temperature and strain rate in order to investigate the plastic flow behavior, anisotropic characteristics and microstructural evolution of Ti6Al4V sheets under testing conditions similar to the ones experienced during hot stamping operations. It is shown that the Ti6Al4V anisotropic characteristics under the investigated forming conditions, different from the ones of the superplastic regime, are influenced by the variation of the material texture as a function of the testing temperature. The Ti6Al4V flow stress behavior was analyzed as a function of the deformation temperature and strain rate. Afterwards, the Arrhenius constitutive model was proposed to predict the flow behavior of Ti6Al4V sheets at elevated temperature and strain rate. The statistical analysis of its predictive capabilities suggests that the Arrhenius model guarantees a good accuracy in reproducing the flow behavior of Ti6Al4V sheets.

3D reconstruction of microstructure in a commercial purity aluminum

2006 ◽  
Vol 55 (1) ◽  
pp. 75-80 ◽  
Author(s):  
A. Brahme ◽  
M.H. Alvi ◽  
D. Saylor ◽  
J. Fridy ◽  
A.D. Rollett
Keyword(s):  
3D Reconstruction ◽  
Commercial Purity ◽  
Commercial Purity Aluminum

Hardness recovery of cold worked commercial-purity aluminum

1975 ◽  
Vol 14 (1) ◽  
pp. 55-58
Author(s):  
T.A. El-Bassyouni ◽  
A.N. Abd El-Azim ◽  
A.E. El-Mehairy
Keyword(s):  
Commercial Purity ◽  
Cold Worked ◽  
Commercial Purity Aluminum
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