How to cause calculated strains from PDE for constitutive model

Hi everybody!

I have a quick question for you about implementation own constitutive model.

So my model describe shotcrete behaviour and it’s composed from several parts responsible for shrinkage, reversible creep, elastic behaviour which depend on current stress level etc.
I have used PDE to calculate strain and it works very well, to include elastic modulus which depend on the current stress level I used the stress from linear elastic model.

My question is how to cause these calculated strains in the model? Let say that I have values of scalars for each local direction. Is it good solution just to replace normal equations for linear elastic model under “equation view”? or there is better solution for it?

Thank you in advance for help!