COMPARISON BETWEEN EXPERIMENT AND COMPUTER MODELING OF PLANE-STRAIN SIMPLE-SHEAR ICE DEFORMATION

An examination of both experiments and computer models of polycrystall ine ice undergoing a simple shear suggests that there is good agreemen t. The model has correctly reproduced the deformational and microstruc tural features caused by glide on (0001) in the ice aggregates. This s uccess is particularly prominent for those ice grains with a lattice o rientation suitable for hard or easy glide or kinking, and where there is a sub-horizontal c axis and a larger grain-size. A limitation may be that the model cannot explicitly simulate recrystallization and gra in-boundary migration, which are two other important processes operati ng jointly with glide in experimentally deformed ice. However, through the use of the models, it is possible to show how kinematic factors c an control the processes of recrystallization. The localization of rec rystallization in the polycrystalline ice aggregate is determined by t he stress and strain variations between neighbouring grains.