In situ stress-strain measurements in a deformation-DIA apparatus at P-T conditions of the upper part of the mantle transition zone

2011 ◽  
Vol 96 (11-12) ◽  
pp. 1665-1672 ◽  
Author(s):  
T. Kawazoe ◽  
Y. Nishihara ◽  
T. Ohuchi ◽  
N. Nishiyama ◽  
Y. Higo ◽  
...  
Keyword(s):  
Transition Zone ◽  
In Situ Stress ◽  
Stress Strain ◽  
Mantle Transition Zone ◽  
Strain Measurements

Texture Evolution of Magnesium Single Crystals Deformed by High-Pressure Torsion

2008 ◽  
Vol 584-586 ◽  
pp. 263-268 ◽  
Author(s):  
Bartlomiej J. Bonarski ◽  
Erhard Schafler ◽  
Borys Mikułowski ◽  
Michael Zehetbauer
Keyword(s):  
High Pressure ◽  
Single Crystals ◽  
Room Temperature ◽  
High Pressure Torsion ◽  
Texture Evolution ◽  
In Situ Stress ◽  
Higher Symmetry ◽  
Strain Measurements ◽  
X Ray

Single crystals of technical purity Magnesium (99.8 wt.%) of initial orientations [ ] 2 1 10 and [ ] 2 2 11 were subjected to HPT deformation at room temperature up to strains of 10. The microstructural evolution has been analyzed by X-ray microtexture investigations and by in-situ stress-strain measurements. The results can be described in terms of shear arising from HPT deformation and - with higher strains - in terms of recrystallization. In crystals with hard orientation[ ] 2 2 11 , these features occur at smaller strains than in crystals with soft orientation [ ] 2 1 10 , i.e. with higher symmetry. In general, the observed textures and strength variations are much stronger than those reported for fcc HPT deformed metals.

scholarly journals Tools for examining subglacial bed deformation

1992 ◽  
Vol 38 (130) ◽  
pp. 388-396 ◽  
Author(s):  
Erik Blake ◽  
Garry K. C. Clarke ◽  
Marc C. Gérin
Keyword(s):  
Strain Rate ◽  
In Situ Stress ◽  
Yukon Territory ◽  
Strain Rates ◽  
Strain Measurements ◽  
Bed Deformation ◽  
Instantaneous Strain ◽  
Order Of Magnitude

AbstractDeformation beneath soft-bedded glaciers may be a physical mechanism that contributes to flow instabilities such as surging. If the role of bed deformation is to be understood, a rheological description is required, but the development of a rheology is hampered by a lack of in situ stress and strain measurements. In this paper, we describe four techniques for measuring subglacial strain. Three of these give continuous strain measurements, a capability that permits calculation of instantaneous strain rates and allows comparison of strain data with other time series. To demonstrate the practicability of the techniques, sample results from three summers of experimentation beneath Trapridge Glacier. Yukon Territory, are presented. The data show that subglacial strain rate can vary in amplitude and polarity on an hourly time-scale,and that the instantaneous strain rate can exceed the mean strain rale by an order of magnitude. Observed negative strain rates suggest extrusive flow within basal sediments.

scholarly journals Tools for examining subglacial bed deformation

1992 ◽  
Vol 38 (130) ◽  
pp. 388-396 ◽  
Author(s):  
Erik Blake ◽  
Garry K. C. Clarke ◽  
Marc C. Gérin
Keyword(s):  
Strain Rate ◽  
In Situ Stress ◽  
Yukon Territory ◽  
Strain Rates ◽  
Strain Measurements ◽  
Bed Deformation ◽  
Instantaneous Strain ◽  
Order Of Magnitude

Abstract Deformation beneath soft-bedded glaciers may be a physical mechanism that contributes to flow instabilities such as surging. If the role of bed deformation is to be understood, a rheological description is required, but the development of a rheology is hampered by a lack of in situ stress and strain measurements. In this paper, we describe four techniques for measuring subglacial strain. Three of these give continuous strain measurements, a capability that permits calculation of instantaneous strain rates and allows comparison of strain data with other time series. To demonstrate the practicability of the techniques, sample results from three summers of experimentation beneath Trapridge Glacier. Yukon Territory, are presented. The data show that subglacial strain rate can vary in amplitude and polarity on an hourly time-scale,and that the instantaneous strain rate can exceed the mean strain rale by an order of magnitude. Observed negative strain rates suggest extrusive flow within basal sediments.

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