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Comptes Rendus Physique
Volume 5, n° 7
pages 687-698 (septembre 2004)
Doi : 10.1016/j.crhy.2004.09.001
Dislocations and plasticity in ice
Dislocations et plasticité dans la glace.

François Louchet
LTPCM/ENSEEG, INP de Grenoble, BP 75, 38402 St Martin d'Hères cedex, France 

*Present address: Laboratoire de glaciologie et de géophysique de l'environnement, CNRS, BP 96, 38402 St Martin d'Hères cedex, France.

Possible dislocation Burgers vectors and core structures in ice are discussed, and compared with those in crystals with closely related structures such as semiconductors. Theoretical expressions for dislocation velocities are given, on the basis of microscopic mechanisms in dislocation cores, implicitly including the possible role of protonic disorder and core reconstruction. Macroscopic plastic properties are then examined, such as, for instance, the stress dependence of the strain rate, discussed in terms of dislocation density evolution, and the scale invariance of dislocation avalanches, as shown by acoustic emission. To cite this article: F. Louchet, C. R. Physique 5 (2004).

The full text of this article is available in PDF format.

Nous discutons les différents vecteurs de Burgers et structures de coeur des dislocations dans la glace, en référence à ceux de cristaux ayant des structures très proches comme les semiconducteurs. Nous donnons des expressions théoriques pour les vitesses de dislocations, basées sur les mécanismes microscopiques dans le coeur des dislocations, incluant implicitement un rôle possible du désordre protonique et de la reconstruction du coeur. Les propriétés macroscopiques sont ensuite examinées, comme la dépendance en contrainte de la vitesse de déformation, discutée en termes d'évolution des densités de dislocations, et l'invariance d'échelle des avalanches de dislocations, mises en évidence par émission acoustique. Pour citer cet article : F. Louchet, C. R. Physique 5 (2004).

The full text of this article is available in PDF format.

Keywords : Ice, Plasticity, Creep, Dislocations, Protonic disorder, Lattice friction

Mots-clés : Glace, Plasticité, Fluage, Dislocations, Désordre protonique, Friction de réseau

© 2004  Académie des sciences@@#104156@@
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