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Article Dans Une Revue Journal de Physique Colloques Année : 1987

RATE CONTROLLING PROCESSES IN THE CREEP OF POLAR GLACIER ICE

P. Pimienta
  • Fonction : Auteur
P. Duval
  • Fonction : Auteur

Résumé

Torsion tests have been carried out on artificial ice and on samples cut from an ice core obtained at South Pole Station. Results give a stress exponent smaller than 2 for stresses lower than 0.1 MPa. Analysis of the inclinometer survey of the Dye 3 borehole yields the same result. The deformation mechanisms of polar ice at low stresses are reviewed. A Newtonian viscosity may be expected with dislocation glide accommodated by grainboundary migration linked with graingrowth. However, rotation of crystals by dislocation glide and strain-induced boundary migration are complementary and efficient mechanisms to accommodate the incompatible plastic deformation between grains of different lattice orientation. These deformation mechanisms concern a great part of polar ice.

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Dates et versions

jpa-00226280 , version 1 (04-02-2008)

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P. Pimienta, P. Duval. RATE CONTROLLING PROCESSES IN THE CREEP OF POLAR GLACIER ICE. Journal de Physique Colloques, 1987, 48 (C1), pp.C1-243-C1-248. ⟨10.1051/jphyscol:1987134⟩. ⟨jpa-00226280⟩

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