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Creep behaviour of ice single crystals loaded in torsion explained by dislocation cross-slip
Authors:Juliette Chevy  François Louchet  Paul Duval
Affiliation:1. Laboratoire Science et Ingénierie des Matériaux et Procédés , Groupe GPM2, Grenoble INP, CNRS/UJF , BP46, F-38402 St Martin d'Hères cedex , France;2. Laboratoire de Glaciologie et de Géophysique de l'Environnement , UJF/CNRS , BP96, F-38402 St Martin d'Hères cedex , France;3. Laboratoire de Glaciologie et de Géophysique de l'Environnement , UJF/CNRS , BP96, F-38402 St Martin d'Hères cedex , France
Abstract:Torsion creep experiments are carried out in order to understand the physics of ice plasticity. A dislocation spreading mechanism based on double cross-slip of basal dislocations is proposed to explain the strong plastic anisotropy and the power law relationship between stress and strain rates. The scenario is tested using three-dimensional dislocation dynamics simulations. Numerical investigations give a stress exponent n?=?2.3 in agreement with experimental measurements. This dislocation spreading mechanism sheds a new light on the interpretation of former experimental observations.
Keywords:dislocation dynamics  creep  ice  cross-slip
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