Dislocation dynamics in Ge single crystals under conditions of periodic two-level intermittent loading

1993 ◽  
Vol 138 (2) ◽  
pp. 601-606
Author(s):  
Yu. L. Iunin ◽  
V. I. Nikitenko ◽  
V. I. Orlov
Keyword(s):  
Single Crystals ◽  
Dislocation Dynamics ◽  
Intermittent Loading

Dislocation dynamics and thermally-activated deformation of MgO single crystals

1973 ◽  
Vol 28 (6) ◽  
pp. 1341-1352 ◽  
Author(s):  
M. N. Sinha ◽  
D. J. Lloyd ◽  
K. Tangri
Keyword(s):  
Single Crystals ◽  
Dislocation Dynamics ◽  
Thermally Activated

Uniaxial Stress Deformation Experiment for Validation of 3-D Dislocation Dynamics Simulations

2002 ◽  
Vol 124 (3) ◽  
pp. 290-296 ◽  
Author(s):  
David H. Lassila ◽  
Mary M. LeBlanc ◽  
Gregory J. Kay
Keyword(s):  
Experimental Data ◽  
Single Crystal ◽  
Single Crystals ◽  
High Purity ◽  
Axial Stress ◽  
Uniaxial Stress ◽  
Dislocation Dynamics ◽  
Uniform State ◽  
Dynamics Simulations ◽  
Unconstrained Motion

An apparatus has been developed for performing compression deformation experiments on oriented metallic single crystals to provide data for validation of 3-D dislocation dynamics simulations. The experiment is performed under conditions that allow unconstrained motion of the upper and lower compression platen, and thus a relatively uniform state of axial stress is maintained during the deformation. Experiments have been performed on high-purity Mo single crystal and polycrystalline Cu. Various aspects of the experimental procedures and results are presented. Possible usages of the experimental data for the validation of 3-D dislocation dynamics simulations are discussed.

scholarly journals Modeling Collective Dislocation Dynamics in Ice Single Crystals

1999 ◽  
Vol 578 ◽  
Author(s):  
M.-Carmen Miguel ◽  
A. Vespignani ◽  
S. Zapperi
Keyword(s):  
Acoustic Emission ◽  
Single Crystals ◽  
Dislocation Dynamics ◽  
Dynamic Critical Phenomena ◽  
Burgers Vector ◽  
Avalanche Dynamics ◽  
Dislocation Pinning ◽  
Line Defects ◽  
Experimental Findings ◽  
Power Law Distributions

AbstractWe propose a model to study the plasticity of ice single crystals by numerical simulations. The model includes the long-range character of the interaction among dislocations, as well as the possibility of mutual annihilation of these line defects characterized by its Burgers vector. A multiplication mechanism representing the activation of Frank-Read sources due to dislocation pinning is also introduced in the model.With our approach we are able to probe the dislocation patterns, which result from the dislocation dynamics. Furthermore, our results exhibit features characteristic of driven dynamic critical phenomena such as scaling behavior, and avalanche dynamics. Some of these results account for the experimental findings reported for ice single crystals under creep deformation, like the power-law distributions of the acoustic emission intensity observed sistematically in experiments.

Sign in / Sign up

Export Citation Format

Share Document