RT Journal Article
SR 00
ID 10.1016/j.ijplas.2009.10.009
A1 Segurado Escudero, Javier
A1 Llorca Martinez, Francisco Javier
T1 Discrete dislocation dynamics analysis of the effect of lattice orientation on void growth in single crystals
JF International Journal of Plasticity
YR 2010
FD 2010-06
VO 26
IS 6
SP 806
OP 819
K1 Dislocations; Numerical simulations; Plastic deformation; Single crystals
AB The micromechanisms of plastic deformation and void growth were analyzed using discrete dislocation dynamics in an isolated FCC single crystal deformed in-plane strain in the  plane. Three different stress states (uniaxial tension, uniaxial deformation and biaxial deformation) were considered for crystals oriented in different directions and with a different number of active slip systems. It was found that strain hardening and void growth rates depended on lattice orientation in uniaxial tension because of anisotropic stress state. Crystal orientation did not influence, however, hardening and void growth when the crystals were loaded under uniaxial or biaxial deformation because the stress state was more homogeneous, although both (hardening and void growth rates) were much higher than under uniaxial tension. In addition, the number of active slip systems did not substantially modify the mechanical behavior and the void growth rate if plastic deformation along the available slip systems was compatible with overall crystal deformation prescribed by the boundary conditions. Otherwise, the incompatibility between plastic deformation and boundary conditions led to the development of large hydrostatic elastic stresses, which increased the strain hardening rate and reduced the void growth rate.
PB Elsevier
SN 0749-6419
LK http://oa.upm.es/8490/
UL http://www.sciencedirect.com/science/article/pii/S074964190900148X