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Springback Behavior Prediction of Benchmark Problem II Numisheet 2008 Model Under Smooth Drawbead

An accurate modelling of the sheet metal deformations including the springback prediction is one of the key factors in the efficient utilisation of Finite Element Method (FEM) process simulation in industrial application. The accurate simulation of the drawing products will not be useful since springback will occur after the tools are removed off the drawing die set. The springback prediction should be further performed to see the final formed shape after the elastic recovery. The elastic behaviour of the metal will be contributing to other geometrical forming defects, such as thinning and wrinkling.
This paper presents an evaluation of a standard benchmark model defined as Benchmark II of Numisheet 2008. This is an S channel model with various drawbeads. For benchmark evaluation purpose, only smooth drawbead is chosen and two finite element application packages based on implicit codes i.e DYNAFORM and AUTOFORM are utilised for simulating the forming process as well as the calculation of the springback distortion.
Results are presented with comparison of the two packages. The simulation strategy involved are discussed to provide a general approach that may influence the results. The results are also revealing the influence of the smooth drawbeads when this type of bead is introduced to the model.
The simulation results show that the application of implicit finite element code in predicting springback distortion is sufficiently effective. The two simulation results from different commercial packages are in a good agreement. One thing that should be taken into consideration for further research is accommodating springback to obtain a better geometrical accuracy.

Keywords: Smooth Drawbead, DYNAFORM, AUTOFORM, Springback