TY  - JOUR
A1  - Placidi, Luca
A1  - Greve, Ralf
A1  - Seddik, Hakime
A1  - Faria, Sérgio
T1  - Continuum-mechanical, Anisotropic Flow model for polar ice masses, based on an anisotropic Flow Enhancement factor
Y1  - 2009
VL  - 22
IS  - 3
SP  - 221
EP  - 237
JF  - Continuum Mechanics and Thermodynamics
JF  - Continuum Mechanics and Thermodynamics
DO  - 10.1007/s00161-009-0126-0
DO  - 10.23689/fidgeo-2793
PB  - Springer-Verlag
N2  - A complete theoretical presentation of the Continuum-mechanical, Anisotropic Flow model, based on an anisotropic Flow Enhancement factor (CAFFE model) is given. The CAFFE model is an application of the theory of mixtures with continuous diversity for the case of large polar ice masses in which induced anisotropy occurs. The anisotropic response of the polycrystalline ice is described by a generalization of Glen’s flow law, based on a scalar anisotropic enhancement factor. The enhancement factor depends on the orientation mass density, which is closely related to the orientation distribution function and describes the distribution of grain orientations (fabric). Fabric evolution is governed by the orientation mass balance, which depends on four distinct effects, interpreted as local rigid body rotation, grain rotation, rotation recrystallization (polygonization) and grain boundary migration (migration recrystallization), respectively. It is proven that the flow law of the CAFFE model is truly anisotropic despite the collinearity between the stress deviator and stretching tensors.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/7106
ER  -