Abstract
Summary For the purpose of studying the folding and springback of high strength steel sheets, a plane strain finite element program is developed. The program takes account of the geometrical and material nonlinearities due to the large displacements, finite rotations and plastic deformation, which occur during the metal forming process. The friction forces between the punch, the upper and lower binder and the sheet modelled by Coulomb's friction law, are also taken into account. An iterative procedure is carried out during each increment in order to maintain equilibrium overall the process and to permit unloading during the springback. The numerical results obtained are in good agreement with experimental values of springback.
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