Numerical analysis of sheet metal U-Bending process

Jiansheng Xia, Shasha Dou

Yancheng Institute of Technology, Yancheng, 224051, China
Nanjing University of Aeronautics & Astronautics, nanjin, 211106, China

The sheet metal U-bending forming is a complex process, based on the assumption of Prandtl-Reuss flow rule and Von Mises yield criterion, the incremental elastoplastic large deformation finite element model was established based on the Updated Lagrangian Formulation (ULF). The elastoplastic conversions of boundary and deformation are reduced with rmin rule. The friction phenomenon of slippage and viscosity at the boundary interface is revised with increment of revision Coulomb rule. The increment rules are led into the whole stiffness matrix, and derived out the stiffness equation. The studies show that the influence on U-Bending deformation of sheet metal is influenced by die structure and parameter. The results show there is a good consistency between the finite element simulation and experimental result.