Hi
I made two polygonal-based tanks (32 sides) equal in size and material, applying the same load, the first with brick elements and the second with shell elements.
Comparing the results I obtained substantially equal displacements (difference of about 5%), but very different values for the ideal stresses and for buckling multipliers. I don’t understand the reason
Thanks for the help
I attach files
Serb_Solid.pmx (5.4 MB)
Serb_Shell.pmx (3.0 MB)
It’s hard to compare that because the models differ quite a lot - the solid one is a single part coarsely meshed with distorted tetrahedral elements (too few of them in the thickness direction, hexahedrons would be much better). The shell one consists of individual plates connected at the edges with tie constraints. Notice how those plates behave at the connections (they deform like window blinds):
1 Like
Thanks for the answer.
I have another question. I created a symmetric structure loaded symmetrically and I get incorrect values of the constraint reactions, in particular RF1 and RF2 different from each other (they should have zero value). I don’t understand the reason. Thanks for the help.
File link: https://wetransfer.com/downloads/849ce91a7fd77b2dfd92c2249a9f4f7e20250316173719/7f702a94c6d70d709aaff4bdc67f71e520250316173810/895916?t_exp=1742405839&t_lsid=0085f9d0-5aa1-4b0b-b974-c03c9655abd0&t_network=email&t_rid=Z29vZ2xlLW9hdXRoMnwxMTY3ODU1OTkwMzYwNzE4OTAwMTQ=&t_s=download_link&t_ts=1742146690