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by fandaL
Sun Aug 01, 2021 8:18 pm
Forum: FEM
Topic: Reaction force request
Replies: 15
Views: 2180

Re: Reaction force request

Do we need to change something in the FreeCAD FEM inp file in this regard? No, if I understood the hex41434’s question correctly, it was only about understanding what is in ccx_dat_file object. We can rather write some note about reaction forces to documentation. I have just mentioned it at https:/...
by fandaL
Fri Jul 30, 2021 11:15 am
Forum: FEM
Topic: Reaction force request
Replies: 15
Views: 2180

Re: Reaction force request

The output in *.dat file is a sum of reaction forces (with components Fx, Fy, Fz). E.g. if you have a beam fixed at both ends and you use one Fixed Constraint object for both ends, total reaction force (as printed) will correspond to external load. If you will use one Fixed Constraint object for one...
by fandaL
Thu Jul 29, 2021 4:12 pm
Forum: Python scripting and macros
Topic: Quad Mesh
Replies: 15
Views: 5587

Re: Quad Mesh

tried this again ... - set "Recombine All" to True - set "Recombination Allgorithm" to Blossum full-quad" Works gread for first order meshes. Quad4 faces are meshed by Gmsh. But it fails for second order meshes. The quadratic edges will be meshed but the faces are linear. T...
by fandaL
Thu Jul 22, 2021 8:22 am
Forum: FEM
Topic: Solver for Mystran
Replies: 63
Views: 3380

Re: Solver for Mystran

Official Mystran 12.1 documentation
https://www.mystran.com/forums/showthread.php?tid=39
does not know CTRIA6. There are only CTRIA3 and CQUAD4 (and CTRIA3K and CQUAD4K for thin variants without transverse shear deformation).
by fandaL
Tue Jul 13, 2021 11:01 am
Forum: FEM
Topic: Hinges between plates/shells
Replies: 46
Views: 3103

Re: Hinges between plates/shells

Corrected to: $-------SID-----P-------EID1----THRU----EID2----7-------8-------9-------+------- PLOAD2 350 -10000.026 THRU 85 Going down and NU=0.17 It is 3.55 um now. Still small. The pressure is applied on elements 26-85. If I count well, that is 60 elements. Looking at the picture, top face conta...
by fandaL
Tue Jul 13, 2021 6:46 am
Forum: FEM
Topic: Hinges between plates/shells
Replies: 46
Views: 3103

Re: Hinges between plates/shells

johnwang wrote: Tue Jul 13, 2021 4:21 am Why the max shows 'nm', maybe my MAT1 card is not right.
Hinge1CQUAD4.dat.txt contains only the load by 10 Pa, if the units are m, N, Pa

Code: Select all

$-------SID-----P-------EID1----THRU----EID2----7-------8-------9-------+-------
PLOAD2  350     10.00   26      THRU    85
by fandaL
Mon Jul 12, 2021 9:09 pm
Forum: FEM
Topic: Hinges between plates/shells
Replies: 46
Views: 3103

Re: Hinges between plates/shells

To be easier for hand modifications, I used very course mesh (two quad4 elements per width). concrete_plates_test.FCStd Hand modifications of the inp file: Nodes on the hinge edges are duplicated: 1, 3, 5, 7, 11, 17 duplicated as 40-45 Elements on the top face with replaced nodes: element 45, nodes ...
by fandaL
Mon Jul 12, 2021 8:29 am
Forum: FEM
Topic: Cannot get FEM Frequency analysis to work.
Replies: 2
Views: 408

Re: Cannot get FEM Frequency analysis to work.

Hello, your file is OK. It seems that you have same FC version and same problem as this guy https://forum.freecadweb.org/viewtopic.php?f=18&t=58792 Try different CalculiX as UR_ suggested https://forum.freecadweb.org/viewtopic.php?f=18&t=58792&hilit=frequency&start=10#p506164 or down...
by fandaL
Sun Jul 11, 2021 11:04 am
Forum: FEM
Topic: Simulating Low Youngs Modulus <0.5MPa Problem Limitation
Replies: 10
Views: 821

Re: Simulating Low Youngs Modulus <0.5MPa Problem Limitation

Hello, there is fixed precision when FreeCAD writes modulus in MPa to the CalculiX input file. You can edit it manually before running the analysis: Click "Edit .inp file" Find *ELASTIC card close to the end of the file On the next line, there are elastic modulus in MPa and Poisson number ...
by fandaL
Sun Jul 11, 2021 10:45 am
Forum: FEM
Topic: Hinges between plates/shells
Replies: 46
Views: 3103

Re: Hinges between plates/shells

Possible approach is to separate elements by duplicating nodes on the hinge edge, so that elements on one side does not share nodes with elements on the other side. Next, you would generate *EQUATIONs on duplicate nodes to connect translation DOF, so that rotation DOF are independent (hinged). You c...

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