pre-stressed pre/post-tensioned concrete bridge

About the development of the FEM module/workbench.

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bernd
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Re: pre-stressed pre/post-tensioned concrete bridge

Postby bernd » Mon Aug 20, 2018 4:35 pm

from gmsh documentation on http://gmsh.info/doc/texinfo/gmsh.html

Coherence Mesh;

Removes all duplicate mesh vertices.


Screenshot_20180820_183506.png
Screenshot_20180820_183506.png (14.12 KiB) Viewed 221 times
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HarryvL
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Re: pre-stressed pre/post-tensioned concrete bridge

Postby HarryvL » Mon Aug 20, 2018 5:55 pm

Final test with contact included looks fine in FreeCAD:


Contact_No_Coherence_CompSolid_Contact.png
Contact_No_Coherence_CompSolid_Contact.png (110.9 KiB) Viewed 217 times


but the same in ParaView shows that after export the nodes get connected again ?!?!?


Contact_No_Coherence_CompSolid_Contact_PV.png
Contact_No_Coherence_CompSolid_Contact_PV.png (262.1 KiB) Viewed 217 times

Contact_No_Coherence_CompSolid_Contact_PV_2.png
Contact_No_Coherence_CompSolid_Contact_PV_2.png (323.66 KiB) Viewed 217 times


Anyway, FreeCAD, GMSH and CCX respond in a predictable way.
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HarryvL
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Re: pre-stressed pre/post-tensioned concrete bridge

Postby HarryvL » Mon Aug 20, 2018 6:16 pm

But when I create a small gap, as suggested by UR_, then also PV displays a sensible results:


Contact_No_Coherence_CompSolid_Contact_PV_3.png
Contact_No_Coherence_CompSolid_Contact_PV_3.png (291.42 KiB) Viewed 216 times


If there is a Paraview guru amongst us .... is there a Coherence option in ParaView too? It would save me adding small gaps at all contact surfaces, with potential mistakes.
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HarryvL
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Re: pre-stressed pre/post-tensioned concrete bridge

Postby HarryvL » Mon Aug 20, 2018 6:29 pm

Here is the FC file for those who want to play with it :D


Contact_003.fcstd
(647.49 KiB) Downloaded 9 times
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bernd
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Re: pre-stressed pre/post-tensioned concrete bridge

Postby bernd » Mon Aug 20, 2018 7:25 pm

seams not to happen on pipeline creation ...

FreeCAD standard result object:
Screenshot_20180820_212211.png
Screenshot_20180820_212211.png (466.67 KiB) Viewed 207 times

FreeCAD VTK result pipeline:
Screenshot_20180820_212343.png
Screenshot_20180820_212343.png (730.06 KiB) Viewed 207 times



but at exporting to VTK file format ... Did you use FreeCAD Vtk pipline export to exort to VTK?

bernd
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HarryvL
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Re: pre-stressed pre/post-tensioned concrete bridge

Postby HarryvL » Mon Aug 20, 2018 7:35 pm

I used File > Export > FEM Result VTK .... is there another way?
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HarryvL
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Re: pre-stressed pre/post-tensioned concrete bridge

Postby HarryvL » Mon Aug 20, 2018 7:38 pm

bernd wrote:
Mon Aug 20, 2018 7:25 pm
seams not to happen on pipeline creation ...

FreeCAD standard result object:

Screenshot_20180820_212211.png


FreeCAD VTK result pipeline:

Screenshot_20180820_212343.png




but at exporting to VTK file format ... Did you use FreeCAD Vtk pipline export to exort to VTK?

bernd
Aaaaaaaaa ... the fcstd file I posted was with the small gaps !!!! That works well in ParaView. The one with zero gap gives the sticking nodes.
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HarryvL
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Re: pre-stressed pre/post-tensioned concrete bridge

Postby HarryvL » Mon Aug 20, 2018 7:56 pm

I re-did it with zero gap and you are right (of course :D ) the VTK pipeline works well, but the exported results to ParaView not ?!


VTK_Pipeline.png
VTK_Pipeline.png (425.24 KiB) Viewed 200 times


Here the file I used for zero gap:


Contact_004.fcstd
(121.76 KiB) Downloaded 8 times
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bernd
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Re: pre-stressed pre/post-tensioned concrete bridge

Postby bernd » Mon Aug 20, 2018 8:37 pm

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HarryvL
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Re: pre-stressed pre/post-tensioned concrete bridge

Postby HarryvL » Mon Aug 20, 2018 9:45 pm

Post tensioning ...


I am running out of time (and patience :twisted: ). I attach the file for those who want to try. This should work "as is". Actual post-tensioning would be the next step, but not before this simple load case converges.

CB_Post_Rev1.fcstd
(133.29 KiB) Downloaded 12 times
CB_Post_Rev1.fcstd
(133.29 KiB) Downloaded 12 times