The effect of loading conditions on the tensile stress versus strain response of micron-sized planar crystals with a single active slip system was investigated via finite and small deformation discrete dislocation plasticity analyses. When rotation of the tensile axis was prevented, lattice curvature was induced in the crystal in both the small and finite strain analyses with the build-up of geometrically necessary dislocations resulting in a hardening response. The hardening rate was higher in the small strain analyses and this was attributed to the assumption of linear kinematics in that analysis. On the other hand, when rotation of the tensile axis was permitted, no lattice curvature was induced in the crystal in the small strain analysis resulting in an ideally plastic response. However, the change in the geometry of the crystal induced bending moments in the crystal in the finite strain analyses giving rise to a mildly hardening tensile stress versus strain response.

Discrete Dislocation Plasticity Analysis of Single Slip Tension. V.S.Deshpande, A.Needleman, E.Van der Giessen: Materials Science and Engineering A, 2005, 400-401, 154-7