The rules for the lattice rotation during rolling (plane
strain) deformation of fcc polycrystals are studied with a
viscoplastic self-consistent model. Very high values of the
ratesensitivity exponent are used in order to establish Sachs-type
conditions with large local deviations from the macroscopic
strain. The lattice rotation depends on the grain shape. For
equiaxed grains the lattice rotation follows the MA rule, which is
the one normally used in solid mechanics. For elongated and flat
grains the lattice rotation follows a different rule, the PSA
rule. In the standard version the model performs a transition from
MA to PSA with increasing strain. There is avery clear difference
between the textures resulting from the two different rules. MA
leads to a copper-type texture, and PSA leads to a brass-type
texture.
Viscoplastic Self-Consistent Formulation as Generalized Material Model for Solid Mechanics Applications
