|About this Abstract
||NUMIFORM 2019: The 13th International Conference on Numerical Methods in Industrial Forming Processes
||S-01: Modeling of the Anisotropic Behavior in Plasticity
||Comparison of Strain-path Indicators for Analysis of Processes in Sheet-bulk Metal Forming
||Florian Gutknecht, Manfred Vogel, Robert Schulte, Marion Merklein, Daniel Rosenbusch, Sergej Koch, Sven Hübner, Bernd-Arno Behrens, A. Erman Tekkaya, Till Clausmeyer
|On-Site Speaker (Planned)
Typical sheet-bulk metal forming (SBMF) processes are combinations of sheet metal forming operations and bulk metal forming operations. Thus, these processes are accompanied by high plastic strains and assumed to undergo strong non-linear strain-paths. Knowledge of strain-path is for several reasons advantageous. Apart from the known influence on springback, it might also influence the necessary force, which is a crucial aspect in the bulk forming operations. Different indicators for strain path changes suggested by Schmitt, van Riel and Clausmeyer et al. are evaluated concerning their relevance for sheet-bulk metal forming. The former two indicators are solely based on kinematics, while the latter considers the material behaviour as well. After validation of the implementation for single-element tests, the indicators are evaluated for characterization tests like subsequent tension-shear, or bulge-torsion experiments. Finally, an outlook will be given on basis processes of SBMF, like edge thickening, or gear forming. It is found that Schmitt indicator is not very suited for analysis due to the instantaneous changes after occurrence of the strain-path change. The van Riel indicator has shortcomings because manually adjustable fitting parameters are necessary. The indicator, which considers the material behaviour, enables not just the detection of strain-path occurrence, but can also give hints on the importance due to the influence of material behaviour.