Strain hardening in bent copper foils

摘要: Abstract A series of systematic tensile and microbend tests were conducted on copper foil specimens with different thicknesses. The made a having almost unidirectional crystal orientations that was considered to be nearly single-crystal. In order investigate the effects slip system interactions, two relative direction in tests: one is close coplanar double-slip orientation, other ideal cube orientation (the coincides [0 0 1]) yields multi-planar multi-slip deformation. We extended test method include reversal bending, we attempted divide total amount strain-hardening into isotropic kinematic hardening components. tests, no tendency size dependence observed. size-dependent behavior observed for both orientations, while only case. introduce an plasticity model accounts geometrically necessary dislocations (GNDs), which correspond spatial gradients crystallographic slips. Through numerical simulations performed using model, origin discussed.