Numerical prediction of springback and side-wall curl in U-bending of anisotropic sheet metals

Finite Element method (FEM) is becoming an important modeling tool in sheet metal forming industry. The knowledge of the sheet metals springback after forming is necessary to control the manufacturing process. This paper deals with the springback And side-wall curl in 2-D draw bending. An anisotropy property for material is considered. A FE code "ELFEN" has been carried out for numerical simulation. The modeling of problem is performed by the explicit method for loading stage and the combination of the implicit and explicit method for unloading stage. Different significant parameters are examined within the framework of the present investigation. For instance, the influences of the blankhoder force. and friction coefficient are investigated in detail.