Hinges between plates/shells
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Re: Hinges between plates/shells
Yes. I want avoid github itself as a can. But at first my local branch should work anyway. Then make the diffs.
Thanks!
Greetings
user1234
Thanks!
Greetings
user1234
Re: Hinges between plates/shells
http://www.feacluster.com/CalculiX/ccx_ ... de278.html
This Bernd provided link says "A *MPC card automatically triggers the NLGEOM parameter, i.e. a geometrically nonlinear calculation is performed, except if the MPC is a mean rotation MPC."
For mean rotation MPC, you could see example here http://www.feacluster.com/CalculiX/ccx_ ... de353.html
Re: Hinges between plates/shells
MPC is equivalent to this EQUATION. For Nastran95: G1=point 1, C1=1 (x displacement), A1=1.0fandaL wrote: ↑Tue Jul 13, 2021 11:01 amCode: Select all
** BINDING DOF OF DUPLICATED NODES ** NODES 1 AND 40 *EQUATION 2 1, 1, 1, 40, 1, -1
G2=point 40,C2=1 (x displacement),A2= - 1.0
Last edited by johnwang on Mon Jul 19, 2021 8:55 pm, edited 3 times in total.
Re: Hinges between plates/shells
Here is a working version with MPC as hinge for Mystran.
Last edited by johnwang on Mon Jul 26, 2021 9:33 am, edited 4 times in total.
Re: Hinges between plates/shells
Here is a working version with RBE2 as hinge for Mystran. The result is 8.5, same as the commercial one.
Does Calculix has RBE2? Nastran95 is CRBE2.
Does Calculix has RBE2? Nastran95 is CRBE2.
Last edited by johnwang on Fri Jul 16, 2021 11:28 am, edited 1 time in total.
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Re: Hinges between plates/shells
Hi John, thanks for your work.
There is a question in the german forum about Frame3DD.
Maybe you can answer Lauries question. Dont hesitate to write in english.
https://forum.freecadweb.org/viewtopic. ... 9&start=50
There is a question in the german forum about Frame3DD.
Maybe you can answer Lauries question. Dont hesitate to write in english.
https://forum.freecadweb.org/viewtopic. ... 9&start=50
Re: Hinges between plates/shells
Re: Hinges between plates/shells
Is there anyone already pursuing this?
Got a window of opportunity and was thinking of trying to give it a serious go.
Tough I'm been poking around the code and it seems like a more complicated task than I initially thought. But you can't blame a guy for trying.
Got a window of opportunity and was thinking of trying to give it a serious go.
Tough I'm been poking around the code and it seems like a more complicated task than I initially thought. But you can't blame a guy for trying.
Re: Hinges between plates/shells
I have uploaded a working version with MPC as hinge for Mystran.twangrt wrote: ↑Mon Jul 26, 2021 9:26 am Is there anyone already pursuing this?
Got a window of opportunity and was thinking of trying to give it a serious go.
Tough I'm been poking around the code and it seems like a more complicated task than I initially thought. But you can't blame a guy for trying.
For Calculix, you need to understand the 'mean rotation MPC' I mentioned.
Re: Hinges between plates/shells
The only working solution for Calculix we have found so far is by changing the original mesh, which is not something I am happy with ... https://forum.freecadweb.org/viewtopic. ... 20#p516277
It would be cool if we would found something without changing the mesh and without triggering nonlinear analysis.
It would be cool if we would found something without changing the mesh and without triggering nonlinear analysis.