Von mises stress results / shell forces

Grasshopper Karamba3D
1

Hello
I am looking for the values of the von mises constraints of a plate in the local reference mesh.

In my attached example, I find 4.22KN/cm2
With the ShellvecResults method, I find almost the same values (different from the fact that it is not the average of the stresses on the vertices if I understood correctly).

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However I would like to have the constraints as a function of the local vectors and not the main vectors.
The idea is to have several load and support analyses on a mesh, and to add the constraints between them afterwards. So to find the same constraints sig.xx sig.yy ect on each mesh with the same direction.

I use the method with S-Forces, and I recalculate for each constraint (nxx, nyy, mxx.ect) the associated constraints which I combine with the general Von Mises method:

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but I don’t find the same values at all, and I don’t think it’s a unity problem. Can anyone help me?

Thanks

test von mises results.gh (46.0 KB)

2

Hello Jacques,
could you please internalize the boundary lines of the surface in the gh-definition? Otherwise the definition does not work.
Did you test your approach on a simple square of 1 x 1?
– Clemens

3

Oh sorry… my bad.
herre the file with the internalized boundary
test von mises results intenalize.gh (44.2 KB)

4

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… I had forgotten the root square… :melting_face:
Sorry Clemens.
I seem to have much more consistent results