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Bergstroem Boyce Model - hyperelastic part - convergence problems
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Hello,
I have implemented the nonlinear elastic part (Network A) of
the Bergstroem Boyce model (2001) in a UMAT.
I am using a forward difference approximation with a perturbation of the
deformation gradient for the elasticity tensor (Sun 2008, Miehe 1994). At this stage I am comparing my user material
subroutine with the Abaqus built-in Arruda-Boyce model using a 1-element
cube. When I apply a prescribed
displacement then the two approaches deliver very similar results (stresses).
In a second step I applied a constant load. The simulation using the UMAT did not
converge. However looking at the results
did not reveal any obvious issues. I
then thought that there is a flaw in the formulation of the elasticity tensor. So far I have not found one. I then applied a constant load using the built-in
Abaqus model and – to my surprise – the simulation did not converge
either. I am at the moment a bit
confused as to what could be wrong.
Has anyone any suggestions?
Thanks a lot,
Andreas
- Andreas Burger's blog
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