I am trying to model a parallel plate compression test for a bioresorbable stent, by using just 1/2 model. With one design everything went perfect, when I uploaded the other one (same BCs, same properties...) it doesn't work. Abaqus says that the strain is too high. I tried to distance the shell plate to 1 mm (as you can see here https://www.transfernow.net/dl/20240519I0ZLE9Ss) to see if there was any change, but nothing. Do you know how can I resolve this?

To be complete, I put as BCs: symmetry on the faces cut in half (loading step) and fixed just one node of the stent along the axial direction (in INITIAL step, not loading). Thanks in advance.