Linear Buckling Analysis of Thin Cylindrical Composite Shell

disla

I have completed a Test of a ccx Linear Buckling Analysis of Thin Cylindrical Composite Shell.

The example is based on paper :

https://www.researchgate.net/publication/312081629_Effect_of_Asymmetric_Meshing_on_the_Buckling_Behaviour_of_Composite_Shells_under_Axial_Compression

Effect of Asymmetric Meshing on the Buckling Behavior of Composite Shells under Axial Compression
April 2017
International Journal for Computational Methods in Engineering Science and Mechanics 18(1):47-63
DOI:10.1080/15502287.2016.1276348
Authors:
Zia ul Rehman Tahir
University of Engineering and Technology Lahore
Parthasarathi Mandal
The University of Manchester

I invite users to try to solve the problem by themselves. Conventional BC doesn't work.
The goal is to obtain mode shapes as symmetric as possible. That’s the signal to know one has nailed the BC setup.

disla

The file separated in case I need to update.
Feel free to comment in case someone finds any improvement.
This same problem can be found solved on YouTube with Abaqus but my approach has some small differences (more symmetric mode shape).