Asking for help regarding the failure modelling of polymers in Abaqus

Hi guys,

I have a porous structure (bio-scaffold) made of photopolymer. After doing experimental compression test for this model, I found out that the stress/strain curve has a non-linear section (non-elastic behaviour) before it gets fractured.

Can anybody advise me which criterion in Abaqus is appropriate for modelling this structure? Actually I had tried XFEM with MAXPs Damage criterion, but the problem was that this material is not completely brittle and shows some ductile behaviour before cracking and fracture, and so XFEM may not predict its ultimate compressive strength correctly.

Thanks,

Ali