Efficient implicit FEM simulation of sheet metal forming


Boogaard, A.H. van den and Meinders, T. and Huetink, J. (2003) Efficient implicit FEM simulation of sheet metal forming. In: VII International conference on computational plasticity, COMPLAS, April 7-10, 2003, Barcelona, Spain.

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Abstract:For the simulation of industrial sheet forming processes, the time discretisation is
one of the important factors that determine the accuracy and efficiency of the algorithm. For
relatively small models, the implicit time integration method is preferred, because of its inherent
equilibrium check. For large models, the computation time becomes prohibitively large and, in
practice, often explicit methods are used. In this contribution a strategy is presented that enables
the application of implicit finite element simulations for large scale sheet forming analysis.
Iterative linear equation solvers are commonly considered unsuitable for shell element models.
The condition number of the stiffness matrix is usually very poor and the extreme reduction
of CPU time that is obtained in 3D bulk simulations is not reached in sheet forming simulations.
Adding mass in an implicit time integration method has a beneficial effect on the condition number.
If mass scaling is used—like in explicit methods—iterative linear equation solvers can lead
to very efficient implicit time integration methods, without restriction to a critical time step and
with control of the equilibrium error in every increment. Time savings of a factor of 10 and more
can easily be reached, compared to the use of conventional direct solvers.
Item Type:Conference or Workshop Item
Engineering Technology (CTW)
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