Buckling problem. Answers not matching.

- March 1, 2024 at 11:14 pm
  
  Hasnain Muzammil
  Subscriber
  
  Hey guys! I hope you are doing well. I am having a problem replicating one of research paper result for practice and I really need an immediate help.
  
  The probelem involves buckling of thin cyldrical shell under axial compression. Now as per the analytical formulation the result comes out to be 1588 something. The research paper also used FEA package and his result is very much similar to analytical results. However , when I ran the same simulation in ANSYS my answer comes out to be 1473
  
  Maybe I am messing up with the Boundary conditions as both the edges are simply supported. Therfore I constrained the the two siplacements except for axial one on load edge and all the dsilpacement and the rotation in load direction on the other edge.
  
  What possible mistake I might be making in this analysis?
- March 4, 2024 at 4:26 pm
  
  dlooman
  Ansys Employee
  
  You're only 5% off! That's not bad for a buckling result. You might get closer if you create a cylindrical coordinate system at the center of the cylinder and support the base with a Displacement in rotated Y (theta) and Z (axial) directions. The image in the paper looks like ROTY is also constrained.