Improvements in FE-analysis of real-life sheet metal forming


Huetink, J. and Boogaard, A.H. van den and Geijselaers, H.J.M. and Meinders, T. (2000) Improvements in FE-analysis of real-life sheet metal forming. In: European Congress on Computational Methods in Applied Science and Engineering, ECCOMAS 2000, 11-14 September 2000, Barcelona.

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Abstract:An overview will be presented of recent developments concerning the application
and development of computer codes for numerical simulation of sheet metal forming
processes. In this paper attention is paid to some strategies which are followed to improve the
accuracy and to reduce the computation time of a finite element simulation. Special attention
will be paid to the mathematical modeling of the material deformation and friction, and the
effect of these models on the results of simulations. An equivalent drawbead model is
developed which avoids a drastic increase of computation time without significant loss of
accuracy. The real geometry of the drawbead is replaced by a line on the tool surface. When
an element of the sheet metal passes this drawbead line an additional drawbead restraining
force, lift force and a plastic strain are added to that element. A commonly used yield
criterion for anisotropic plastic deformation is the Hill yield criterion. This description is not
always sufficient to accurately describe the material behavior. This is due to the
determination of material parameters by uni-axial tests only. A new yield criterion is
proposed, which directly uses the experimental results at multi-axial stress states. The yield
criterion is based on the pure shear point, the uni-axial point, the plane strain point and the
equi-biaxial point.
Item Type:Conference or Workshop Item
Engineering Technology (CTW)
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