Hi, Guys

   I would like to run the low temperature retraction analysis of elastomer base on the standard of ISO 2921.

The standard elastomer specimen was installed between two blocks, one side was fixed and then pull the other end to elongate the elastomer as 250% as the origin length. 

Four load steps were included:

1) Tensile the elastomer at the room temperature;

2) Low the temperature to -70℃；

3）Release the displacement constriant on the pull side at -70℃；

4) Heat the temperature to 23 ℃。

     Record the displacement of block vs the step time. And the hyperelastic model , expansion coffcient and mullins effect have been defined for the elastomers.

From the displacement curve, we can observe the elastomer return to the origin position at step#3  even if the temperature is -70℃. So it doesn't make sense.

   I think the material parameters of elastomer is insuffcient for the low temperature retraction. Is there anyone who has any experience on it ?  

    Many thanks.

Abaqus ​​​​​​​