Auxetic structure Poisson's ratio and material deformation simulation

[ap_alexispascual]

I have a huge problem with how I'll use Autodesk Simulation Mechanical 2014 to study an auxetic structure and how it behaves when it is stretched. In the attached drawing, what i'm planning to do is to introduce tensile stress on the structure by pulling in the y-direction. The material is made up of rubber and it should stretch vertically, as well as horizontally (since it's auxetic [materials with negative poisson's ratios]). As a result, the pores should open up. I'm planning to measure its Poisson's ratio. Is it possible to do such a thing? Can you please teach me how to do it? I really need it for my thesis. 

[zhuangs]

For rubber materials, hyperelastic material models are recommended, since they are incompressable.

-Shoubing

[ap_alexispascual]

Is there an availble tutorial as to how i could possibly do this? I'm sorry, i don't have much experience with simulation software. 😧

[zhuangs]

Hyperelastic material models: Mooney-Rivlin, Arruda-Boyce, Ogden, Yeoh, Neo-Hookean, Van der Waals, Blatz-Ko, Hyperfoam

Yeoh and Blatz-Ko are good for rubber material.

For the material property information:

http://help.autodesk.com/view/ASMECH/2015/ENU/?guid=GUID-CEB8E8E7-7F79-4AFF-9E77-3B6A1AB11F4B

For curve fitting:

http://help.autodesk.com/view/ASMECH/2015/ENU/?url=http://help.autodesk.com/cloudhelp/2015/ENU/SimMe...

-Shoubing