strange result for contact constraint

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UR_
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Posts: 1354
Joined: Tue Jan 03, 2017 8:42 pm

strange result for contact constraint

Post by UR_ »

Hello,
I am running into an strange issue, while doing some analysis containing contact constraints.
There was something wrong with provided results.

So i setup appended test case with known analytical solution
doppelbalken.png
doppelbalken.png (142.12 KiB) Viewed 1423 times
doppelbalken.FCStd
(790.52 KiB) Downloaded 44 times
Here deflection should be
[/quote]
analytical.png
analytical.png (38.64 KiB) Viewed 1423 times
I have tested two binaries for windows
cygwin build:
https://github.com/easyw/ccx_prool/blob ... _MT-64.exe
referenced here:
https://forum.freecadweb.org/viewtopic. ... 30#p137816
with this result
result easyw.png
result easyw.png (22.55 KiB) Viewed 1423 times
and this

mingw64 build:
https://github.com/ddfem/ccx_mingw64/bl ... .11_MT.exe
with this result
result ddf.png
result ddf.png (20.87 KiB) Viewed 1423 times
Have i done something wrong, or overseen? :?

Done with:
OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.17.10460 (Git)
Build type: Release
Branch: master
Hash: 91c59c7910436c44ede608e29d9a90a287121a11
Python version: 2.7.8
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.0.0
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bernd
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Posts: 12849
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland
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Re: strange result for contact constraint

Post by bernd »

I have not yet tested your files. What I can tell is different ccx binaries could give different results, yes. I had similar issue. You may read this topic: https://forum.freecadweb.org/viewtopic.php?f=18&t=20276 The maintainer said some ccx uses patched libraries for compiling.

I'm gone try your example too.
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