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2021
Conference Paper
Titel

Cross-sectional warping in sheet metal forming simulations

Abstract
For most sheet metal forming simulations, shell elements that consider a reduced stress state, in particular, assuming a zero transverse normal stress ?33 and neglecting the shear stress components ?13 and ?23 in the yield function, are used. Moreover, certain kinematic assumptions, like cross-sectional material fibers being assumed to remain straight during deformation, are typically applied. However, for some applications, like bending with small radii and thick sheets, this approach is not a workable solution to obtain accurate and reliable results, since the prerequisites that justify the aforementioned kinematic assumptions are not met anymore. In this contribution, a 3d-shell element is presented that allows for cross-sectional warping. For the evaluation, numerical results of a metal stripe drawn through a draw bead are compared against experimental data. The results demonstrate that the 3d-shell element is able to represent warping of cross-sectional material fibers during deformation. In addition, further numerical tests conducted with this element are shown.
Author(s)
Willmann, T.
Institute for Structural Mechanics, University of Stuttgart
Bischoff, M.
Institute for Structural Mechanics, University of Stuttgart
Wessel, A.
Fraunhofer-Institut für Werkstoffmechanik IWM
Butz, A.
Fraunhofer-Institut für Werkstoffmechanik IWM
Beier, T.
thyssenkrupp Steel Europe AG
Hauptwerk
13th LS-DYNA European Conference and User's Meeting - Online and on-site. Book of abstracts
Funder
Bundesministerium fur Wirtschaft und Energie BMWi (Deutschland)
Konferenz
European LS-DYNA Conference 2021
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Language
English
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Fraunhofer-Institut für Werkstoffmechanik IWM
Tags
  • sheet metal forming

  • simulations

  • 3d-shell

  • LS-Dyna

  • velocity

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