PrePoMax (CalculiX FEA) - Tutorial 15 - Shell-to-solid connection
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- เผยแพร่เมื่อ 29 ต.ค. 2024
- PrePoMax is an open-source pre- and postprocessor for (also open-source) finite element analysis solver CalculiX. It's extremely user friendly and doesn't even require installation. PrePoMax can be used only on Windows.
In this tutorial I would like to show you how to connect an edge of a shell part with a surface of a solid part.
Note: swapping surface assignments in tie constraint definition may resolve the issue with spurious stress distribution
Geometry in step format: drive.google.c...
PrePoMax homepage: prepomax.fs.um...
Excellent tutorial. Thank you for producing these and highlighting the new features and continuous development of PreProMax !
I’m glad that you like it :-) I still have a lot of ideas for tutorials and I’ll try to realize as many of them as possible. Especially that PrePoMax’s capabilities expand very fast. The biggest problem is that it’s not easy to verify some cases with analytical solutions but I want to stick to such verification for now, that’s a very important part for me.
@@FEAnalyst I am attempting to do a 2D thermal analysis of two flat simple rectangular plates that touch along one edge, but I am having difficulty effectively contacting the edges. for the heat transfer to occur. The heat does not flow from one plate to the other. I have a temperature on one edge and a convection on the other.
Not sure what I am missing. I normally do this on Ansys and I am trying to replicate a test case on PreProMax.
Would you kindly do a tutorial video of a very simple steady state 2D test case for us ?
Did you connect these parts with tie constraint or thermal contact ? This is necessary unless the plates have continuous mesh.
I will soon start a series of tutorials regarding thermal and thermomechanical analyses (I wanted to cover some important topics on solid mechanics first). 2D simulations will also come in the near future since the upcoming version of PrePoMax will support them.
Under which physical situations (connections) we should prefer the first (solid-to-shell) constraint?
Connecting solids with shells this way can make sense when modeling structures with large thin-walled members that can be simplified to shells but are also connected to smaller regions of interest. So for example, pipes, beams or pressure vessel walls connected with welds, flanges or other joints. Both tie constraint and tied contact may work well if master-slave assignment is done properly but I would still trust tied contact more.
Nice demonstration as always. Can you make a tutorial about plasticity?
There is already one about plasticity - check tutorial number 9.
Hello great video!, I was trying a to create a shell to shell contact . but when I'm creating the contact I don't know how to tell prepomax that I want the Top part of one shell connected to the bottom of the other shell (Im modeling a plate on top on another plate and there is a gap between the shells equal to the thickness of the plates) , could you advise on this ?
In PrePoMax you just have to click on the proper side of the shell surface, it will be highlighted in red or pink (depending if it's a master or slave surface). Then, once you confirm the selections and create a contact pair, both surfaces (sides of a shell) will be yellow by default. Internally, this is handled by Sx labels (S1 - negative normal direction or S2 - positive normal direction) in *Surface keywords.
Are you able to combine a shell with quad dominated mesh with a standard tetrahedral mesh on a solid part?
Yes, it's not a problem for tie constraint or tied contact.