Nonlinear Material Model in Part Variation Simulations of Sheet Metals

Journal article, 2019

Current methodologies for variation simulation of compliant
sheet metal assemblies and parts are simplified by
assuming linear relationships. From observed physical
experiments, it is evident that plastic strains are a source
of error that is not captured in the conventional variational
simulation methods. This article presents an adaptation
towards an elasto-plastic material model with isotropic
hardening in the Method of Influence Coefficients methodology
for variation simulations. The results are presented
in two case studies using a benchmark case involving a 2D
quarter symmetric plate with a centred hole, subjected to
both uniaxial and biaxial displacement. The adaptation
shows a great reduction in CPU time with limited effect on
the accuracy of the results compared to Direct Monte Carlo
simulations.