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      Ice crystals are interesting model materials for 3D4 modelling: it is easy to build large single crystals and plasticity is mostly confined in the basal slip systems of the HCP structure.

     Here, the simulation box is taken as a cylinder with an axis colinear to the c direction of the HCP structure. A torsion momentum is applied around the c axis.
    Screw dislocations are shearing the crystal from the external radius, where the stress is the highest, towards the symmetry axis.
    A regular dislocation arrangement is observed with a regular spaced array : a pure torsion boundary.

    The number of dislocation lines on the 3 activated slip systems is directly related to the applied momentum.

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mise à jour le 23 mars 2009

Univ. Grenoble Alpes