Dislocations and plasticity in ice

François Louchet

doi:10.1016/j.crhy.2004.09.001

Dislocations and plasticity in ice
[Dislocations et plasticité dans la glace.]

Présenté par : Guy Laval

François Louchet ¹

¹ LTPCM/ENSEEG, INP de Grenoble, BP 75, 38402 St Martin d'Hères cedex, France

Comptes Rendus. Physique, Volume 5 (2004) no. 7, pp. 687-698.

Résumé
Abstract

Nous discutons les différents vecteurs de Burgers et structures de cœur 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 cœur des dislocations, incluant implicitement un rôle possible du désordre protonique et de la reconstruction du cœur. 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.

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.

Publié le : 2004-09-01

DOI : 10.1016/j.crhy.2004.09.001

Keywords: Ice, Plasticity, Creep, Dislocations, Protonic disorder, Lattice friction
Mot clés : Glace, Plasticité, Fluage, Dislocations, Désordre protonique, Friction de réseau

Affiliations des auteurs :

François Louchet ¹

¹ LTPCM/ENSEEG, INP de Grenoble, BP 75, 38402 St Martin d'Hères cedex, France

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François Louchet. Dislocations and plasticity in ice. Comptes Rendus. Physique, Volume 5 (2004) no. 7, pp. 687-698. doi : 10.1016/j.crhy.2004.09.001. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2004.09.001/

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