Is there any commercial FEM code to implement a orthotropic linear viscoelastic material model?

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Is there any commercial FEM code to implement a orthotropic linear viscoelastic material model?

I have the orthotropic time dependent properties (Prony coefficients for each independent component, relaxation times), but I dont know how to introduce them in a commercial FEM code. Abaqus and...

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Ružica R. Nikolić

Contact professor Miroslav Zivkovic at Faculty of Engineering, University of Kragujevac, Serbia. He is leading the team implementing special program called PAK.

Dirk Frederik De Lange

You could try implementing in Comsol. It does not have predetermined models in which you only fill in the coefficients, but its flexibility allows implementing material models as you need.