The study on elliptical flange hole forming based on finite element analysis

Jiansheng Xia^{1, 2}, Shasha Dou^{1, 2}

¹Yancheng Institute Of Technology, Yancheng City, Jiangsu Province, China, 224051

²Nanjing University of Aeronautics & Astronautics, Nanjing City, Jiangsu Province, China, 211106

The flange hole forming is a complex process, Under the assumption of Prandtl-Reuss flow rule and von Mises yield criterion, the incremental elasto-plastic large deformation finite element model was established based on the Updated Lagrangian Formulation (ULF).The elasto-plastic conversions of boundary and deformation are reduced with r-min 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 steel elliptical hole flange forming deformation is influenced by punch structure and parameter. The dates show that finite element simulation and experimental result have a good consistency.