The Forming Limit Curve (FLC) is a very useful tool to assess either the plastic behavior of thin metallic sheets or the tooling design to solve manufacturing problems during the try-out steps. This work presents the mathematical modeling of the FLC based on elasto-plastic constitutive equations and anisotropic plasticity yield criterion. It is firstly demonstrated that the limit strains in the biaxial stretching domain are controlled by a material parameter defined by the ratio between the yield stresses in plane-strain tension and equibiaxial tension. The theoretical predictions of the proposed model showed a good agreement with the experimental data available in the literature for an aluminum A1100 sheet and also indicated that the parameters of plasticity model, adopted to describe the initial plastic anisotropy of metallic sheets, must be identified from monotonic uniaxial and biaxial tensile tests data.
Modeling; forming limit curve; metal plasticity; sheet metal forming
