Prediction of sheet necking with shell finite element models


Boogaard, A.H. van den and Huetink, J. (2003) Prediction of sheet necking with shell finite element models. In: Sixth ESAFORM Conference on Material Forming, April 28-30, 2003, Salerno, Italy.

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Abstract:In sheet forming simulations, the prediction of localised necking is an important goal. A pragmatic
approach is to compare calculated principal strains with a forming limit curve (FLC). However, the FLC’s
are known to depend on the strain path and most experimental FLC’s are determined for straight deformation
paths. Localisation can also be determined numerically with a Marciniak–Kuczynski analysis (M–K). It is
recognised that a FEM analysis with shell elements resembles the M–K analysis very much. For uniform
deformations a band with slightly reduced thickness is necessary to trigger localisation. In practical forming
conditions, however, the non-uniformity of the process automatically triggers localisation and an arbitrary initial
imperfection is not needed. FEM models have the additional benefit that boundary conditions, non-proportional
deformation and e.g. friction with the tools are completely included.
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Engineering Technology (CTW)
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