Odonovane-
What are the Voce constants?
Our FEA guy also uses Ansys, He always needs to know Young's modulus (modulus of Elasticity), 29000KSI (or thereabouts IIRC, Ultimate Tensile strength, 65-90KSI (depending on form and processing), You said you have yeild stress, the only other one (physicla property) I have easily is %elongation at break, 30-40.
Hope this helps
Nick