Crushable Foam Model Calibration

[moeenhappy]

Hi,

I am currently facing difficulties in calibrating abaqus crushable foam model with my experimental results.
I think I am bit confused about what values needs to be input in the model.
Right now my elastic properties are: E=400 MPa, v=0 (because its crushing)
In plastic under crushable foam I use compression yield stress ratio =1
and hydrostatic yield stress ratio =0.1.

Under crushable foam hardening card (Here I am confused), I convert the engineering stress to true stress using

(T.stress=E.Stress(1+E.strain))

and I convert the engineering strain to first true strain using

(T.strain=ln(1+E.strain)) and then to plastic strain using

P.Strain = T.strain - Yield Stress/E

So in short, I input True Stress and Plastic strain in the Hardening table.

1) Is this procedure right or am I approaching wrongly?

2) What do I need to extract from Abaqus in terms of Stress and Strains to compare with my experimental data ? (do I need to plot PE22 and S22?)

Please guide me in this regards.