Nitinol stent simulation

[Iamkishor.]

Hello everyone!
I am working on fatigue analysis of nitinol stent.
I have successfully crimped the stent and I remove the interaction between the crimping tool and the stent in the next step for self-expansion. But it is not working.
So, is there anyone working or who have worked on nitinol stent analysis?
I need help.
Thank you!

 

[FEA way]

Which software do you use for this analysis ? What exactly is wrong with the simulation ?