Search found 233 matches

Go to advanced search

by ebrahim raeyat
Sun Mar 01, 2020 2:42 pm
Forum: FEM
Topic: [Fixed] brick20 (hexa20) mesh gives other results than tet10
Replies: 15
Views: 409

Re: brick20 mesh gives other results than tet10

OK tested with self weight and pressure constraint. Both work well. File attached. Seams some problems with the node load calculations for CLOAD entry of force constraint for brick20 in calculix input file goes wrong. It will need some debugging ... tet10-brick20_self_pressure.FCStd I also analyse ...
by ebrahim raeyat
Sun Mar 01, 2020 3:34 am
Forum: FEM
Topic: OpenSees, the Open System for Earthquake Engineering Simulation
Replies: 90
Views: 4975

Re: OpenSees, the Open System for Earthquake Engineering Simulation

this is my first attempt to visualize 3D cantilever beam with openseespy, it's cool:
3D_cantilever.png
3D_cantilever.png (117.31 KiB) Viewed 136 times
by ebrahim raeyat
Sat Feb 29, 2020 6:17 pm
Forum: FEM
Topic: OpenSees, the Open System for Earthquake Engineering Simulation
Replies: 90
Views: 4975

Re: OpenSees, the Open System for Earthquake Engineering Simulation

bernd wrote:
Sat Feb 29, 2020 10:29 am
have you read FEM_Mesh and FEM_Mesh_CalculiX they may help
oops, i mistake this section in convert .inp file to opensees format:

Code: Select all

xyz[-1] = xyz[-1].rstrip("\n")
last coordinate z, have "\n" character, this is now work, i will prepare .tcl and .py file soon.

thanks @bernd
by ebrahim raeyat
Sat Feb 29, 2020 8:43 am
Forum: FEM
Topic: OpenSees, the Open System for Earthquake Engineering Simulation
Replies: 90
Views: 4975

Re: OpenSees, the Open System for Earthquake Engineering Simulation

according to this issue on openseespy-pip i changed the name of element, but new question: node numbering for C3D20 element is different than 20NodeBrick element in opensees, i map those node number, but it gives me this error: Twenty_Node_Brick::Jacobian3d - Non-positive Jacobian: -1.73472e-11 0 -8...
by ebrahim raeyat
Fri Feb 28, 2020 4:35 pm
Forum: FEM
Topic: OpenSees, the Open System for Earthquake Engineering Simulation
Replies: 90
Views: 4975

Re: OpenSees, the Open System for Earthquake Engineering Simulation

according to a post on the issue OpenSeesPy is opensource and included in main opensees. Would be good if one you you both opensees guys would test this OpenSeesPy and could give some feedback. Python is the languarge we speak, thus it would be cool to use this one. cheers bernd yes, it is in main ...
by ebrahim raeyat
Fri Feb 28, 2020 3:01 am
Forum: FEM
Topic: OpenSees, the Open System for Earthquake Engineering Simulation
Replies: 90
Views: 4975

Re: OpenSees, the Open System for Earthquake Engineering Simulation

https://github.com/berndhahnebach/FreeCAD_bhb/commits/femopensees only implements the solver object. - start FreeCAD - add analysis, delete standard solver and add a OpenSees solver - run the solver - this file will be written and run with OpenSees https://github.com/berndhahnebach/FreeCAD_bhb/blob...
by ebrahim raeyat
Fri Feb 28, 2020 2:14 am
Forum: FEM
Topic: OpenSees, the Open System for Earthquake Engineering Simulation
Replies: 90
Views: 4975

Re: OpenSees, the Open System for Earthquake Engineering Simulation

I would not care about the element type ATM. If opesees uses a twenty node brick element it will be fine too. It does not mater which element type we gone use. Both should give the nearly same deflection and stress if we use enought elements. ATM it is not possible to make a brick20 mesh with the g...
by ebrahim raeyat
Thu Feb 27, 2020 5:28 pm
Forum: FEM
Topic: OpenSees, the Open System for Earthquake Engineering Simulation
Replies: 90
Views: 4975

Re: OpenSees, the Open System for Earthquake Engineering Simulation

The same as in tcl, examples to get started are needed. Best would be freecad fem calculix cantilever in opensees python. @bernd, i searched for equivalent Ten-node tetrahedral element for opensees, but i can't find it. for preparing 3D contilever, how can i change the element type in FreeCAD, for ...
by ebrahim raeyat
Wed Feb 26, 2020 9:22 pm
Forum: FEM
Topic: OpenSees, the Open System for Earthquake Engineering Simulation
Replies: 90
Views: 4975

Re: OpenSees, the Open System for Earthquake Engineering Simulation

thanks to openseespy, we can write opensees input file in python format and benefit from all of python library!

https://openseespydoc.readthedocs.io/en/latest/
by ebrahim raeyat
Wed Feb 26, 2020 9:07 pm
Forum: FEM
Topic: OpenSees, the Open System for Earthquake Engineering Simulation
Replies: 90
Views: 4975

Re: OpenSees, the Open System for Earthquake Engineering Simulation

bernd wrote:
Tue Feb 25, 2020 10:07 pm
With this we could read results into FreeCAD directly. That would be cool and worth to search for.
opensees can export to .pvd format that supported with paraview:

pvd.png
pvd.png (50.89 KiB) Viewed 191 times
this brief file is also useful:

http://marcel-ritter.com/wp-content/upl ... Poster.pdf

Go to advanced search