Wrong results in output
I'm performing a static structural simulation which includes a temperature variation and a displacement applied to a specimen which should represent the central part of an hourglass specimen. You can find a picture attached. I'm applying simmetry boundary conditions to all the faces and I'm applying the displacement on the top face(A on the picture).
The simulation is a non linear one.
The problem is that I should get the maximum stress at the center of the specimen so bottom part of the reduced specimen model but I get it on the outer part. If I model the full speciment I get the right position of the maximum stress but modeling this small part I get wrong results. Any idea why?