*TIE constraint for ccx (aka "bonding faces")

[bernd]

... just delete all "At least one ... "

No, I dreamed something like this (similar to my commit):

Code: Select all

 message += "{} has empty references.\n".format(c["Object"].Name)

git commit 7dcc02d

[bernd]

Any comments?
How to proceed to get it finished?

We need to find a solution for this problem: https://forum.freecadweb.org/viewtopic.php?f=18&t=43092

[bernd]

IMHO in the writer should be only code to write the file not to get the data out of the mesh. Furthermore did the contact only support tets and no quad and it used the very slow old depretiated method. Fixing it was on my TODO for years. Since tie would even more of this code introduce I decided to fix the contact code. Would be good to do this for the tie as well before merge. Would you give it a try. BTW: What is you opinion about the binary search. Is should be x-times faster! git commit da71719

how about this? https://github.com/berndhahnebach/FreeC ... it/6c385b0

[UR_]

how about this?

Sorry, couldn't ATM, but looks nice.

Please note that in case of contact constraint, both faces (master and slave) could be the same face, so called self contact.
I think this isn't applicable for *TIE

http://mecway.com/forum/discussion/813/ ... y-calculix


Another difficulty will arise in case of *SECTION PRINT
Because there is no gap and concerning face is part of two touching solids, we need only volume elements touching positive side (front side) of face.
Backside and touching fem elements are not of interest.
Means, face and fem element's face has nearly same normal.

[bernd]

ahh ... will add some comments in this regard

BTW: tie is ready to merge IMHO

[bernd]

Please note that in case of contact constraint, both faces (master and slave) could be the same face, so called self contact.

cools stuff ... https://www.youtube.com/watch?v=oZUEp4sPWpU would be good to know if this works in FreeCAD too ...

Screenshot_20200219_174549.png (305.86 KiB) Viewed 931 times

[bernd]

merged

https://github.com/FreeCAD/FreeCAD/comm ... 2d9fcaba+0

[bernd]

TODOs ... in the wiki
- new entry on FEM main page
- new command entry
- upload icon to wiki artwork

[Kunda1]

TODOs ... in the wiki
- new entry on FEM main page
- new command entry
- upload icon to wiki artwork

[bernd]

TODOs ... in the wiki
- new entry on FEM main page
- new command entry
- upload icon to wiki artwork

@UR_ would you go for this?

even if there is no real content on the command page, it would be good to have it.