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IDProjectCategoryView StatusLast Update
0004366FEMBugpublic2021-02-06 06:23
ReporterFreeCAD97990 Assigned To 
Status newResolutionopen 
Target Version0.20 
Summary0004366: Tube does not show Fixed or Force Constraints
DescriptionI've noticed that Fixed Constraints and Force Constraints are not displayed when they are specifed on the end faces of a Tube.

Please see the attached file.

I've looked at a number of different cross sections, like a solid bar, and also tubes with square, hexagonal, and octagonal hollow profiles, and they all show Fixed Constraints and Force Constraints properly.

I was at first concerned that because the Constraints were not shown on the screen then the Constraints had not been applied to the Calculix model either. But when I went on to mesh and solve the Analysis, then there is deformation that shows that the Fixed and Force Constraints have actually been applied. They also appear in the Calculix inp file.

I put out a Forum post on this issue on Thu May 14, 2020 6:26 pm and bernd replied on Thu May 14, 2020 8:34 pm to confirm the bug and to say that it seemed to occur when the walls of the Tube are thin (less than around 10mm). He said we should make a entry on mantis and post a link to it here.

Now, I'm not too good at making links, so please refer to these posts if I haven't managed to put a link into this bug report.
Steps To ReproduceJust load the attached file. No constraints are shown. I've just tested it with the latest 0.19 release, and the problem is still there.
TagsNo tags attached.
FreeCAD InformationOS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.21514 (Git)
Build type: Release
Branch: master
Hash: 89ddab33f692a9bd739171689f9ab0eb58d64b35
Python version: 3.6.8
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/United Kingdom (en_GB)



2020-06-08 09:19



2022-03-03 13:55

administrator   ~0016906

This ticket has been migrated to GitHub as issue 6073.

Issue History

Date Modified Username Field Change
2020-06-08 09:19 FreeCAD97990 New Issue
2020-06-08 09:19 FreeCAD97990 File Added: Tube does not show Fixed or Force Constraints.FCStd
2021-02-06 06:23 abdullah Target Version => 0.20