Defining material properties for polyurethan

[gizmo85]

I have a task to perform a static FEM analysis for a machine part made of Polyurethan. As I normally do static analysis for metal parts, where I define only two material parameters (Young’s Modulus and Poisson’s Ratio) I’m a little bit confused right now. Why? Because in the literature there are many parameters for this PU:
- Tensile strength and modulus
- Compressive strength and modulus
- Flexural strength and modulus

How should I define this material in Abaqus for a simple case of static loading?

 

[gizmo85]

The stress-strain diagram goes something like this (see attachment).

Should I even consider the flexural strenght in Abaqus analysis?