Visco-elasticity and the Compressive Failure of Polycrystalline Ice

by Paul Duval, CNRS, St Martin d'Heres, France,
Pierre Kalifa, CNRS, St Martin d'Heres, France,
Renaud Lestringant, CNRS, St Martin d'Heres, France,

Abstract: The analysis of the visco-elasticity of polycrystalline ice is addressed. Experimental results on isotropic and anisotropic polycrystalline ice are presented, which indicate that intracrystalline dislocation glide contributes to the major part of the delayed elastic strain. Recoverable strains more than 20 times larger than the calculated elastic strain were observed for Antarctic ice samples. In order to analyze the effect of damage on the visco-elastic component of deformation, uniaxial compression tests at strain-rates of 10-4 and 2 × 10-4 s-1 were carried out. First results indicate that microcracks cause a clear enhancement of the delayed elastic strain.

Subject Headings: Compression tests | Ice | Elastic analysis | Strain | Viscoelasticity | Failure analysis | Material tests | Displacement (mechanics)

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