Stent parallel plate compression

[Bj3245]

I am modelling a parallel plate compression for a vascular stent in ABAQUS. I used 1/2 of the model as reported in literature, applied simmetry where the stent is cut, put a shell plate on the top with fixed displacement anb constrained JUST ONE NODE of the stent along the axial direction. However, I get this message: "The strain increment has exceeded fifty times---"
With one design everything went well, with this other one (same assembly, BCs, everything...) my job does not complete. Do you have an idea of why this happens? Here is the file

https://www.transfernow.net/dl/20240519I0ZLE9Ss

(I tried to put 1mm of distance between the plate and the stent just to see if something changed).
Thanks in advance

 

[FEA way]

You should model the plate as rigid - apply a rigid body constraint to it or create an analytical rigid part and apply boundary conditions to the reference point.

Also, don't use perfect plasticity for the stent. At least add some hardening.