Anisotropic Elasto-plastic Model for Large Metal Forming Deformation Processes
The paper deals with an elasto-plastic model for anisotropic crystalline material, subjected to small elastic strains but large elastic rotations and large plastic deformations, a feature commonly found in metal forming processes. Cases of plane strain and plane stress state are analyzed and locally homogeneous processes are simulated. Computational results underline the role played in the theory by different material constants, as well as the explicit role of the plastic spin. The proposed model can describe the change of the anisotropy axes, experimentally put into evidence in orthotropic sheets deformed along the direction different from those of orthotropy, if and only if the plastic spin is non vanishing.
Elasto-plastic, Orthotropy, Plastic Spin, Large Deformation, Yield Condition.