Numerical investigation of the modelling of elastic behaviour in a wiping-die bending process.
Résumé
The prediction of springback effect in the field of sheet metal forming is of primary interest. This article deals with the interest of accurate modelling of the elasto-plastic behaviour of a metallic material especially in bending operation. A 3D finite element model is used for the prediction of both springback and stress distribution in a wiping-die bending process. Two models have been used to describe the elasto-plastic be-haviour of the material: (i) one phenomenological and (ii) one built on more physical basis. For the first model, Young's modulus of the material and the plastic material characterization were carried out by tensile tests. In the other model, a parameterized bilinear hardening is distributed in each integration point of the finite element of the numerical simulation. The identification of parameters for this model was also carried out by tensile tests. Numerical simulations were carried out with these two models by using ABAQUS Stan-dard finite element code to predict stress distribution and springback during the bending process. Results have been compared and underline the importance of introducing even small, non-linear effect during elastic stage.