A drawbead model with sheet metal passing through multiple bending-unbending processes was employed in this study to understand the springback phenomenon and to develop a numerical simulation technique for more accurate prediction of the springback process. The deformation process is simulated using an implicit finite element modeling code. The predicted results were compared with the physically measured ones, including clamping and restraining forces, thickness strains, and the curvatures of the deformed sheets. Consideration of the Bauschinger effect and employment of a combined isotropic and kinematic hardening models greatly improve the prediction accuracy. Stress and strain histories under various conditions during the drawing process are studied in detail in an attempt to provide a better basis for comparison for dynamic explicit solutions.

Makinouchi, A., Nakamachi, E., Onate, E., and Wagoner, R. H., 1993, “Numerical Simulation of 3-D Sheet Metal Forming Processes,” Proc. 2nd International Conference, NUMISHEET93, Isehara, Japan.
Lee, J. K., Kinzel, G. L., and Wagoner, R. H., 1996, “Numerical Simulation of 3-D Sheet Metal Forming Processes,” Proc. 3rd International Conference, NUMISHEET96, Dearborn, U.S.A.
Huetink, J. and Baaijens, F. P. T., 1998, “Simulation of Materials Processing: Theory, Methods and Applications,” Proc. Numiform’98, Enschede, the Netherlands.
Gelin, J.-C. and Brunet, M., 1999, “Numerical Simulation of 3-D Sheet Metal Forming Processes,” Proc. 4th International Conference, NUMISHEET99, Besancon, France.
Stein, J. J., 1998, “The Effect of Process Variables on Sheet Metal Springback,” IBEC’98 Paper 982299.
S. Jiang, M. Garnett and S.-D. Liu, 2000, “Springback of Sheet Metal Subjected to Multiple Bending-unbending Cycles,” SAE Technical Paper No. 2000-01-1112.
S.-D. Liu, Jiang, S., and Garnett, M., 2000, “Experimental and Numerical Studies of Multiple Bending-Unbending Springback Processes,” Proc. IDDRG2000. PP203-213.
Habbitt, Kalsson & Sorensen, Inc., 1998, Abaqus/Standard User’s Manual, Version 5.8.
Rama, S., Zhang, J. Du. C., Hu, Y., Shih, H.-C., and Liu, S.-D., 2000, “A Study on the Effects of Simulation Parameters on Springback Prediction,” SAE Technical Paper No. 2000-01-1109.
Sanchez, L. R., 1994, “Experimental Simulation of the Sheet Metal Response to Clamping During Forming,” SAE Technical Paper Series 940942.
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