Pressure vessel - Nozzle connection - Shell elements

General Questions
1

Hi guys,

is there any option to “correct” the “missing” material in a midsurface modelled nozzle connection?

When I made the CAD model, everything looked nice.

Thank you much :slight_smile:

nozzle_shell.pmx (6.4 MB)

2

Do you mean the Missing_section-1 element set ? It’s still in the tree but you can delete it. Apparently, you had missing section assignment but corrected it. Now it runs

3

Hi! For me you have to release radial displacements at the pipe edges

4

Hi FEAnalyst,

I meant the marked area - there is like a socketed connection, however I modelled it as a fully inserted nozzle.

nozzle_shell_1
nozzle_shell_1550×458 169 KB

5

Hi Andrea,

I just made this model for play around and figure out the path forward. Is here any radial constraint - like in Ansys or I have set-up something individually at the constranins?

6

To avoid such effects at the connections of shell sections, you could model that area with solid elements and attach them (via tie constraint or tied contact: https://www.youtube.com/watch?v=Kc9Ln8zn3PE) to shell elements of the remaining portion of the pipe. This approach is quite common when accurate representation of nozzle connection is needed.

Or you could even try shell-to-solid submodeling. It seems to be supported in CalculiX: https://www.youtube.com/watch?v=RNVE1rk1yps

New versions of PrePoMax support boundary conditions in local coordinate systems (also cylindrical): https://www.youtube.com/watch?v=F9j0iEf3_4o

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