Microstresses Determined by Neutron Diffraction and Self-consistent Model

2006 ◽  
pp. 477-486
Author(s):  
A. Baczmanski ◽  
C. Braham ◽  
R. Levy-Tubiana ◽  
A. Lodini ◽  
K. Wierzbanowski
Keyword(s):  
Neutron Diffraction ◽  
Consistent Model ◽  
Self Consistent

Localization of Stresses in Polycrystalline Grains Measured by Neutron Diffraction and Predicted by Self-Consistent Model

2011 ◽  
Vol 681 ◽  
pp. 103-108
Author(s):  
Anita Gaj ◽  
Lea le Joncour ◽  
Andrzej Baczmanski ◽  
Sebastian Wroński ◽  
Benoit Panicaud ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Load Transfer ◽  
Diffraction Method ◽  
Lattice Strains ◽  
Consistent Model ◽  
Self Consistent ◽  
Main Component ◽  
Critical Resolved Shear Stress ◽  
Elastic Lattice

Time of flight neutron diffraction method was applied to measure elastic lattice strains in austenitic steel during "in situ" tensile test. Comparing experimental data with self-consistent model, the critical resolved shear stress and hardening parameters were determined for polycrystalline grains. The result allowed us to determine the main component of the stress localization tensor, relating the rate of grain stress with the applied macrostress rate. The evolution of concentration tensor in function of the applied macrostress was analyzed. Finally, the load transfer between grains during yielding of the sample was studied.

scholarly journals Accounting for a Distribution of Morphologies and Orientations on Stresses Analysis by X-Ray and Neutron Diffraction: Normalized Self-Consistent Modeling

2014 ◽  
Vol 996 ◽  
pp. 82-87
Author(s):  
Viwanou Hounkpati ◽  
Sylvain Fréour ◽  
David Gloaguen ◽  
Vincent Legrand
Keyword(s):  
Neutron Diffraction ◽  
Crystallographic Texture ◽  
X Ray ◽  
Consistent Model ◽  
Self Consistent

The historical Eshelby-Kröner self-consistent model is only valid in the case when grains can be assumed similar to ellipsoids aligned preferentially along a same direction into the polycrystal. In this work, distributions of crystallites morphologies and geometrical orientations were accounted for, owing to the so-called generalized self-consistent model, in order to satisfy Hills averages principles. Different nonlinear εφψ-vs.-sin2ψ distributions were predicted in elasticity, even in the absence of crystallographic texture, in the case when several morphologies and geometrical orientations coexist within the same polycrystal.

Study of Stresses in Texture Components Using Neutron Diffraction

2013 ◽  
Vol 768-769 ◽  
pp. 289-295
Author(s):  
Andrzej Baczmański ◽  
Elżbieta Gadalińska ◽  
Sebastian Wroński ◽  
Léa Le Joncour ◽  
Benoit Panicaud ◽  
...  
Keyword(s):  
Experimental Data ◽  
Neutron Diffraction ◽  
Tensile Load ◽  
Group Method ◽  
Model Calculations ◽  
Lattice Strains ◽  
Consistent Model ◽  
Self Consistent ◽  
Full Stress Tensor

In this work a new method for analysis of neutron diffraction results obtained during “in situ” tensile load is proposed and tested. The methodology is based on the measurements of lattice strains during “in situ” tensile test for several hkl reflections and for different orientations of the sample with respect to the scattering vector. As the result the full stress tensor for preferred texture orientations in function of applied stress can be determined with help of crystallite group method. The experimental data are presented and compared with self-consistent model calculations performed for groups of grains corresponding to the measured hkl reflections.

Quantitative Estimation of the Second Order Plastic Incompatibility Stresses in Textured Duplex Steel

2006 ◽  
Vol 524-525 ◽  
pp. 841-846 ◽  
Author(s):  
Sebastian Wroński ◽  
Andrzej Baczmanski ◽  
Krzysztof Wierzbanowski ◽  
Chedly Braham ◽  
Rim Dakhlaoui ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Elastoplastic Deformation ◽  
Quantitative Estimation ◽  
Diffraction Method ◽  
Second Order ◽  
The Self ◽  
Two Phase ◽  
Duplex Steel ◽  
Consistent Model ◽  
Self Consistent

A new method for determining the parameters characterising elastoplastic deformation of two-phase material is proposed. The method is based on the results of neutron diffraction, which are analysed using the self-consistent rate-independent model of elastoplastic deformation. The neutron diffraction method (time-of-flight technique) was applied and the self-consistent model was used to predict the second order stresses in austeno-ferritic duplex steel. Calculations based on the model were successfully compared with experimental results for both phases of the duplex steel.

THEORY AND SELF-CONSISTENT MODEL OF DUST-DRIVEN WINDS

2002 ◽  
Vol 5 ◽  
pp. 65-65
Author(s):  
S. Liberatore ◽  
J.-P.J. Lafon ◽  
N. Berruyer
Keyword(s):  
Consistent Model ◽  
Self Consistent

scholarly journals Stellar Flares: Observations and Theory

1989 ◽  
Vol 104 (2) ◽  
pp. 49-52
Author(s):  
Suzanne L. Hawley
Keyword(s):  
Scaling Law ◽  
Dynamic Scaling ◽  
X Ray ◽  
Temperature Distributions ◽  
Photometric And Spectroscopic Observations ◽  
Stellar Flares ◽  
Consistent Model ◽  
Self Consistent ◽  
Flare Model ◽  
Large Flare

AbstractPhotometric and spectroscopic observations of a very large flare on AD Leo are presented. A self consistent model of a flare corona, transition region and chromosphere is developed; in particular the chromospheric temperature distributions resulting from X-ray and EUV irradiation by coronae of various temperatures are determined. The predicted line fluxes in Hγ are compared to the observed line fluxes to find the coronal temperature as a function of time during the flare. This run of temperature with time is then compared with the predictions of an independent theoretical flare model based on a dynamic scaling law (see paper by Fisher and Hawley, these proceedings).

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