Author(s): J. Meyssonnier
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Keywords: No Keywords
Abstract: Finite-element simulations of compressive creep of a polycrystal of S2-columnar ice loaded in the plane perpendicular to the long direction of the columns are presented. The computations are done by modelling each grain as a transversely isotropic incompressible continuous viscoplastic medium whose symmetry axis is the c-axis of the crystal. The results show that, due to the very strong anisotropy of ice, the number of grains required to homogenize the viscoplastic properties is large, at least 500 for linear behaviour and 1000 for non-linear behaviour, and that the influence on the homogenized properties of the nature of the boundary conditions applied to the polycrystal cannot be neglected.
Year: 2000