scholarly journals Revisited Storage and Dynamic Recovery of Dislocation Density Evolution Law: Toward a Generalized Kocks-Mecking Model of Strain-Hardening

2012 ◽  
Vol 14 (9) ◽  
pp. 759-761 ◽  
Author(s):  
O. Bouaziz
Keyword(s):  
Dislocation Density ◽  
Strain Hardening ◽  
Dynamic Recovery ◽  
Density Evolution ◽  
Evolution Law

A Dislocation Density Based Constitutive Model for Cyclic Deformation

1996 ◽  
Vol 118 (4) ◽  
pp. 441-447 ◽  
Author(s):  
Y. Estrin ◽  
H. Braasch ◽  
Y. Brechet
Keyword(s):  
Cyclic Loading ◽  
Dislocation Density ◽  
Constitutive Model ◽  
Constitutive Equations ◽  
Cyclic Deformation ◽  
Internal Variables ◽  
Density Evolution ◽  
Alloy 800H ◽  
Material Response ◽  
Dislocation Densities

A new constitutive model describing material response to cyclic loading is presented. The model includes dislocation densities as internal variables characterizing the microstructural state of the material. In the formulation of the constitutive equations, the dislocation density evolution resulting from interactions between dislocations in channel-like dislocation patterns is considered. The capabilities of the model are demonstrated for INCONEL 738 LC and Alloy 800H.

Influence of Strain-Hardening and Dynamic Recovery on DDRX Steady State

2021 ◽  
Vol 1016 ◽  
pp. 194-199
Author(s):  
Frank Montheillet ◽  
David Piot
Keyword(s):  
Steady State ◽  
Strain Hardening ◽  
Dynamic Recovery ◽  
Constitutive Parameters

Relationships between macroscopic and microscopic constitutive parameters associated with steady state DDRX are derived for a material in which strain-hardening and dynamic recovery are described by the Yoshie-Laasraoui-Jonas equation. First examples are given for illustration.

scholarly journals Age–depth correlation, grain growth and dislocation-density evolution, for three ice cores

2009 ◽  
Vol 55 (190) ◽  
pp. 345-352 ◽  
Author(s):  
L.W. Morland
Keyword(s):  
Dislocation Density ◽  
Evolution Equation ◽  
Grain Growth ◽  
Ice Cores ◽  
Density Evolution ◽  
Depth Profiles ◽  
Growth Profiles ◽  
The Given ◽  
Theoretical Analyses

AbstractTwo previous theoretical analyses of data from the GRIP, Vostok and Byrd ice cores, presenting age–depth correlations, grain growth and dislocation-density evolution, are re-examined. It is found that the age–depth correlations are inconsistent with the idealized flow with unchanging history adopted, but that good correlations can be obtained by relaxing those restrictions. A modified grain-growth relation is proposed, consistent with the distinct growth profiles of the Vostok and other two cores, which can be solved simultaneously with the given dislocation-density evolution equation. These are solved for all three cores with the given parameters, and the depth profiles of grain diameter and dislocation density at the present time are determined with the new age–depth correlation and with that shown empirically in the papers. The varying flow history influences the age–depth correlation, and hence the depth profiles, which is important both for the interpretation of core data, and for the determination of constitutive variables at each depth at the present time.

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