Volumetric test data.

[psantunes]

Hello!

I need to adjust a new material (rubberlike) for a abaqus analysis. I already have the compressive data, but now I want to introduce the data for a volumetric test (compression test) in order to calculate the "D" factor. I want to know if I have to introduce the values (pressure Vs. Volume ratio) in a negative form like I need to do in the compressive data (Stress Vs strain).

Thanks