TY - JOUR
T1 - A deformation mechanism map for polycrystals modeled using strain gradient plasticity and interfaces that slide and separate
AU - Dahlberg, Carl F.O.
AU - Faleskog, Jonas
AU - Niordson, Christian Frithiof
AU - Legarth, Brian Nyvang
PY - 2013
Y1 - 2013
N2 - Small scale strain gradient plasticity is coupled with a model of grain boundaries that take into account the energetic state of a plastically strained boundary and the slip and separation between neighboring grains. A microstructure of hexagonal grains is investigated using a plane strain finite element model. The results show that three different microstructural deformation mechanisms can be identified. The standard plasticity case in which the material behaves as expected from coarse grained experiments, the nonlocal plasticity region where size of the microstructure compared to some intrinsic length scale enhances the yield stress and a third mechanism, active only in very fine grained microstructures, where the grains deform mainly in relative sliding and separation.
AB - Small scale strain gradient plasticity is coupled with a model of grain boundaries that take into account the energetic state of a plastically strained boundary and the slip and separation between neighboring grains. A microstructure of hexagonal grains is investigated using a plane strain finite element model. The results show that three different microstructural deformation mechanisms can be identified. The standard plasticity case in which the material behaves as expected from coarse grained experiments, the nonlocal plasticity region where size of the microstructure compared to some intrinsic length scale enhances the yield stress and a third mechanism, active only in very fine grained microstructures, where the grains deform mainly in relative sliding and separation.
KW - Strain gradient plasticity
KW - Size-effects
KW - Deformation mechanisms
KW - Grain boundary sliding
U2 - 10.1016/j.ijplas.2012.11.010
DO - 10.1016/j.ijplas.2012.11.010
M3 - Journal article
SN - 0749-6419
VL - 43
SP - 177
EP - 195
JO - International Journal of Plasticity
JF - International Journal of Plasticity
ER -