Grasshopper

algorithmic modeling for Rhino

Hi all,

I was performing shell analysis with Karamba. Especially, I am interested in the contributions of bending and axial energy to the total energy (by the way thank you to the team for this feature, it's very helpful!). I expected the sum of these two energies to be equal to the total energy.

E=E(bending)+E(axial)

This is true when linear analysis is performed, but the values can differ greatly (say 30%) when I perform second order analysis.


Do you have any thoughts on what would explain this?

Best,

Romain M.

Views: 662

Replies to This Discussion

Hi Romain,

thank you for your post. This is a bug in Karamba 1.1.0 which will be removed in the next release.

Best,

Clemens 

Hi Clemens,

thanks for your answer.

Grüsse,

Romain

Hi Clemens and Romain

I have earlier been testing the deformation energy in cases of pure bending and pure axial forces, and it worked fine.
However, I don't seem to get as great results as Romain, when I use it in a proper shell. 
I'll just attach an example of the values I get.
In all af my shells, my axial and bending energy of the same size, and they are seperately almost the same size as the total energy of the model.

I don't know if I've just interpreted the results wrong, but because the axial and bending energy do have different distributions.

Best

Tina

Attachments:

Okay, I think I have found the problem, and it might be a bug.
In the example I posted before, the shell was loaded with gravity load.
In the attached, I applied the load as a mesh load instead, an the results seem more reasonable.

Attachments:

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