Troubleshooting Models & Simulations

[bernd]

all that profile stuff is easy, most is possible with FreeCAD allready. No I mean the nice bending moment diagramms.

[thschrader]

No I mean the nice bending moment diagramms.

Hello Bernd,
for my daily work the stresses are the relevant plot. Even if you can generate the momentum-diagrams
you need the profile tables (moment of inertia and s.o....) to calculate the stresses.
My opinion: do not waste time/work to develop 1D-elements in ccx/FC. There was a discussion
about that (the "faked-beam-element", I cant find the post...)
btw: 4H-Frap is a comercial software, the source code is not open like in FC.
There is no possibility to add new features via python or c++ like users do in FC.
So I must believe the results...(which I do after 25 years of work with 4H-Frap)
Thomas

stresses.JPG (87.98 KiB) Viewed 1824 times

[FemUser]

I am happy to have beam elements. Found them in the GUI. With the example you provided I am hoping to successfully model a truss.

I did not explain myself correctly on my previous question. On this example I will be focusing on surface elements. I know I can define globally element size on the line, surface and volume. Can I define on the target surface x devisions and y devisions. On my sketch I have a rectangular surface I defined 5 divisions on one side and 3 devisions on the other.

SurfaceMesh.png (76.39 KiB) Viewed 1817 times

Another question I have is to know if it is possible to have multi body part and mesh it as a single entity.

BodyMesh.png (181.42 KiB) Viewed 1817 times

Also is it possible to have a body with one surface attached to it. I don't know what to call this.

CombinedMesh.png (118.28 KiB) Viewed 1817 times

These are tasks I perform in proprietary software, slicing bodies or surfaces in preparation for meshing.

[bernd]

No I mean the nice bending moment diagramms.

for my daily work the stresses are the relevant plot. Even if you can generate the momentum-diagrams

It does not matter if it is stress, bending moment diagramm or normal force or what ever. The problem is we need some algorithm to graphical plot some nice scaled area graphics on the lines (beam lines) of a model.

Bernd

[bernd]

I am happy to have beam elements. Found them in the GUI. With the example you provided I am hoping to successfully model a truss.

I did not explain myself correctly on my previous question. On this example I will be focusing on surface elements. I know I can define globally element size on the line, surface and volume. Can I define on the target surface x devisions and y devisions. On my sketch I have a rectangular surface I defined 5 divisions on one side and 3 devisions on the other.

SurfaceMesh.png

Another question I have is to know if it is possible to have multi body part and mesh it as a single entity.

BodyMesh.png

Also is it possible to have a body with one surface attached to it. I don't know what to call this.

CombinedMesh.png

These are tasks I perform in proprietary software, slicing bodies or surfaces in preparation for meshing.

for body mesh see https://forum.freecadweb.org/viewtopic. ... 88#p192974 for combined mesh just use mesh region object. for surface mesh with defined count numbers of elements per edge, you would need python or manually edit the gmsh input file.

[FemUser]

Thanks Bernd. Have to study your references, will come back after.

[bernd]

example for body with surface ...

body_with_surface.fcstd

(450.54 KiB) Downloaded 44 times

screen.jpg (243.01 KiB) Viewed 1758 times

[bernd]

and a more sophisticated example for mesh regions with different element size on edges, faces and solids ...

meshregion.fcstd

(636.77 KiB) Downloaded 41 times

screen.jpg (133.53 KiB) Viewed 1752 times

[saso]

The problem is we need some algorithm to graphical plot some nice scaled area graphics on the lines (beam lines) of a model.

What about the code that is used for the sketcher b-spline curvature comb?

[bernd]

The problem is we need some algorithm to graphical plot some nice scaled area graphics on the lines (beam lines) of a model.

What about the code that is used for the sketcher b-spline curvature comb?

this exactly what we need, If someone starts to implement it in FreeCAD this would be a point to start!