Paper eintragenA constitutive creep model for monocrystalline ice was based upon the multiplication of mobile dislocations. That is, the main mechanism was considered to be dislocation motion on the basal planes of the ice, due to strong creep anisotropy. The preferred crystallographic orientation and temperature of monocrystalline ice were considered when describing the elastic and inelastic deformations. The factors which were used in the model were the dislocation velocity and a varying dislocation density. The proposed uniaxial creep model was developed into a biaxial model by permitting inelastic deformation only along basal planes. Parametric studies were carried out in order to clarify the dependence of macroscopic stress-strain curves upon microstructural parameters. The results revealed a strong effect of the loading rate and stress level. A comparison of the predictions of the model with experimental data revealed excellent agreement over a range of strains.

D.H.Choi, J.J.Connor: Mechanics of Materials, 1997, 25[1], 97-112