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[Thies Blaakman]

Dear all,

I'm trying to model the stress relaxation behaviour of a material after deforming it. I have curve fitted the Prony series for this model to make my material behave viscoelastically and I have some generic linear elastic properties. In order to deform the model, I need many time steps in order to have a converging solution, but these timesteps already include some stress relaxation behaviour due to the viscoelastic material model. I would like to create a seemingly instantaneous linear elastic deformation, then activate the viscoelastic properties and see what happens. I have tried using the MPCHG command, but this of course does not work for nonlinear material models. Is there anyone who can give me a lead on this?

With kind regards,

Thies

[Sampat Kumar]

Hi Thies Blaakman,
Duplicate question of below forum thread.  

/forum/forums/topic/modelling-stress-relaxation-for-viscoelastic-material-with-many-time-steps/

Further inquiries related to this question will be addressed in the mentioned forum thread. 

Best Regards,
Sampat