Evaluation of biaxial flow stress based on elasto-viscoplastic self-consistent analysis of X-ray diffraction measurements

2015 ◽  
Vol 66 ◽  
pp. 103-118 ◽  
Author(s):  
Youngung Jeong ◽  
Thomas Gnäupel-Herold ◽  
Frédéric Barlat ◽  
Mark Iadicola ◽  
Adam Creuziger ◽  
...  
Keyword(s):  
Flow Stress ◽  
X Ray Diffraction ◽  
X Ray ◽  
Self Consistent ◽  
Biaxial Flow

scholarly journals Determining Ti-17 β-Phase Single-Crystal Elasticity Constants through X-Ray Diffraction and Inverse Scale Transition Model

2011 ◽  
Vol 681 ◽  
pp. 97-102 ◽  
Author(s):  
Sylvain Fréour ◽  
Emmanuel Lacoste ◽  
Manuel François ◽  
Ronald Guillén
Keyword(s):  
Mechanical Load ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Β Phase ◽  
Consistent Model ◽  
Self Consistent ◽  
Diffraction Lattice ◽  
Two Phases ◽  
Multi Phase

The scope of this work is the determination of single-crystals elastic constants (SEC) from X-ray diffraction lattice strains measurements performed on multi-phase polycrystals submitted to mechanical load through a bending device. An explicit three scales inverse self-consistent model is developed in order to express the SEC of a cubic phase, embedded in a multi-phase polycrystal, as a function of its X-ray Elasticity Constants. Finally, it is applied to a two-phases (α+β) titanium based alloy (Ti-17), in order to estimate Ti-17 β-phase unknown SEC. The purpose of the present work is to account the proper microstructure of the material. In particular, the morphologic texture of Ti-17 a-phase, i.e. the relative disorientation of the needle-shaped grains constituting this phase, is considered owing to the so-called Generalized Self-Consistent model.

SELF-CONSISTENT X-RAY DIFFRACTION PATTERNS OF PERFECT CRYSTAL

1989 ◽  
Vol 03 (16) ◽  
pp. 1221-1224 ◽  
Author(s):  
H. S. CAMPOS ◽  
W. A. KELLER
Keyword(s):  
Perfect Crystal ◽  
X Ray Diffraction ◽  
Reflection Curve ◽  
X Ray ◽  
Scattering Model ◽  
X Ray Scattering ◽  
Self Consistent ◽  
Diffraction Patterns ◽  
Experimental Findings ◽  
Ray Scattering

We have developed a self-consistent X-ray scattering model for perfect crystal, which leads to obtain diffraction patterns similar to experimental findings. As an application of the model we carried out the calculations for the Si[333] reflection curve.

scholarly journals Effect of Interlamellar Spacing on the Monotonic Behavior of C70 Pearlitic Steel

2014 ◽  
Vol 996 ◽  
pp. 88-93
Author(s):  
Houda Yahyaoui ◽  
Habib Sidhom ◽  
Chedly Braham ◽  
Andrzej Baczmański ◽  
Manuel François ◽  
...  
Keyword(s):  
Plastic Anisotropy ◽  
Critical Shear Stress ◽  
Interlamellar Spacing ◽  
Pearlitic Steel ◽  
Shear Stresses ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lattice Strains ◽  
Consistent Model ◽  
Self Consistent

The effect of interlamellar spacing on monotonic behavior of C70 pearlitic steel was investigated. Tensile tests under X-ray diffraction coupled with self-consistent model have been used to identify the role of interlamellar spacing on the ferrite plasticity parameters and residual stresses. It has been established that yielding of pearlite is controlled by ferrite critical shear stresses ( τc 0α) which is higher for the smaller interlamellar spacing. Moreover, the residual stress level in ferrite is higher for the largest interlamellar spacing under the same imposed total strain. Lattice strains, measured by synchrotron X-ray diffraction, show an elastic and plastic anisotropy of ferrite crystallites and high stresses in cementite which confirm the self-consistent model calculation. Keywords: Pearlitic steel, X-ray diffraction, Synchrotron radiation, Self-consistent model, Critical shear stress, Lattice strains.

Study of Micromechanical Behaviour of Two Phase Polycrystalline Materials Using Diffraction and Self Consistent Model

2014 ◽  
Vol 783-786 ◽  
pp. 2059-2064
Author(s):  
Andrzej Baczmański ◽  
Elżbieta Gadalińska ◽  
Chedly Braham ◽  
Sebastian Wroński ◽  
Lea le Joncour ◽  
...  
Keyword(s):  
Lattice Strain ◽  
Polycrystalline Materials ◽  
X Ray Diffraction ◽  
Two Phase ◽  
X Ray ◽  
Consistent Model ◽  
Self Consistent ◽  
In Situ Deformation ◽  
Specific Orientation

Diffraction methods for lattice strain measurement provide useful information concerning the nature of grains behaviour during elastoplastic deformation. The main advantage of the diffraction methods is the possibility of studying mechanical properties of polycrystalline materials separately in each phase and in groups of grains with a specific orientation. In this work we present application of the neutron and X-ray diffraction to study “in situ” deformation of two phase stainless steels during tensile loading. The experimental results are compared with self-consistent model.

scholarly journals Mesoscopic residual stresses of plastic origin in zirconium: interpretation of X-ray diffraction results

2004 ◽  
Vol 37 (6) ◽  
pp. 934-940 ◽  
Author(s):  
D. Gloaguen ◽  
M. François ◽  
R. Guillen
Keyword(s):  
Experimental Data ◽  
Plastic Deformation ◽  
Residual Stresses ◽  
Rolling Direction ◽  
Deformation Mode ◽  
Prismatic Slip ◽  
X Ray Diffraction ◽  
Active Deformation ◽  
X Ray ◽  
Self Consistent

Complementary methods have been used to analyse residual stresses in a heat-treated Zr702 sheet which had undergone uniaxial plastic deformation: X-ray diffraction and self-consistent models. The elastoplastic self-consistent model has been used to simulate the experiments and exhibits agreement with experimental data. X-ray diffraction analysis in the rolling direction shows opposite stress values for {10\bar{1}4} and {20\bar{2}2} planes, respectively. The measured strains were generated by an anisotropic plastic deformation. The comparison between ∊ϕψversussin2ψ and simulations confirms that prismatic slip is the main active deformation mode. Plastic incompatibility stress in X-ray measurements should be taken into account in order to make a correct interpretation of the experimental data.

Strain Evolution of Highly Asymmetric Polycrystalline Ferroelectric Ceramics via a Self-Consistent Model and In Situ X-Ray Diffraction

2012 ◽  
Vol 95 (12) ◽  
pp. 3947-3954 ◽  
Author(s):  
Goknur Tutuncu ◽  
Maziar Motahari ◽  
Joel Bernier ◽  
Mesut Varlioglu ◽  
Jacob L. Jones ◽  
...  
Keyword(s):  
Ferroelectric Ceramics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Strain Evolution ◽  
Consistent Model ◽  
Self Consistent

scholarly journals Thermal stresses in hexagonal materials –heat treatment influence on their mechanical behaviour

2004 ◽  
Vol 120 ◽  
pp. 185-190
Author(s):  
D. Gloaguen ◽  
S. Freour ◽  
M. François ◽  
R. Guillen ◽  
J. Royer
Keyword(s):  
Mechanical Behaviour ◽  
Thermal Stresses ◽  
Internal Stresses ◽  
X Ray Diffraction ◽  
Cooling Process ◽  
Two Phase ◽  
Plastic Properties ◽  
X Ray ◽  
Consistent Model ◽  
Self Consistent

Internal stresses due to anisotropic thermal and plastic properties were investigated in rolled zirconium and titanium. The thermal stresses induced by a cooling process were predicted using a self-consistent model and compared with experimental results obtained by X-ray diffraction. The study of the elastoplastic response during uniaxial loading was performed along the rolling and the transverse direction of the sheet, considering the influence of the texture and the thermal stresses on the mechanical behaviour. An approach in order to determine the thermal behaviour of phases embedded in two-phase materials is also presented.

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