Uni-axial tension used for plastic bearing material.

Dear all, 

I am trying to simulate the mechanical behaviour of plastic bearing in ANSYS. I used Mcaliberation today for the first time and I was surprised by its ease of use, user friendly interface and quick to learn documentation. 

Regarding my metal bearing, I only got uni-axial tensile stress strain curve from the manufacturer. There was no input for strain rate so I assumed a very slow loading. Also data in compression is not available. 

My questions is: Is it reasonable enough to calibrate "POLYUMOD-Three-Network" using only a single tensile test and that too assuming a very slow rate rate. As of now, I assume the behaviour in compression to be the same as in tension(simply due to lack of data from the manufacturer). My objective is get a rough approximation of the plastic bearing only.

Tips/suggestions/reflections are very welcome.

With best wishes,

Zahid