Combined simulation of quasi-static deep drawing and electromagnetic forming by means of a coupled damage–viscoplasticity model at finite strains
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Date
2012-07-17
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Abstract
The combination of quasi-static and electromagnetic pulse forming increases the
formability of sheet metal forming processes. A cooperation between the institute of
Applied Mechanics (IFAM) of the RWTH Aachen and the Institute of Forming Technology
and Lightweight Construction (IUL) of the TU Dortmund is investigating these processes
both experimentally and by simulation for the deep-drawing process of a cross-shaped
cup. Aim of the work is to show and prove that with this forming strategy we obtain a more
sharpened radius of the cup edges.The combined deformation process is simulated by
means of finite elements using a material model developed in [1,2]. A recently proposed
finite strain anisotropic viscoplastic model, taking combined nonlinear kinematic and
isotropic hardening into account, is coupled with ductile damage in the context of
continuum damage mechanics. For the simulation, the evolution equations for the internal
variables of the constitutive model are numerically integrated in an explicit manner and the
model is then implemented as a user material subroutine in the commercial finite element
package LS-Dyna.
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Keywords
damage, deep drawing, modelling