Karamba3D

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Comment by mehtap altuğ on May 10, 2013 at 7:42am

hi I wanna ask how to apply a surface in "shape optimization irregular structure 5" example which ı draw manually

Comment by Mahdi Soheyli Fard on April 15, 2013 at 1:12pm

Hey,

New problem in reinstalling Karamba happened, what this runtime error is about? and how can we fix this up!?

thanks in advance!

Comment by Karamba3D on April 2, 2013 at 11:51pm

Dear Michel,

thank you for your example. The first principal stress direction of the bottom elements should be horizontal - that is for sure. I haven't found an explanation yet, why Karamba does not display them correctly. If one selects the boundary conditions of a cantilever (shell_test_cp.gh) the directions come out as expected. As soon as there are horizontal or vertical supports on the other end the directions turn. I have to look into that.

Three things regarding your definition: You support the shell at two points only. This leads to theoretical stress singularities there and the solution does not converge with decreasing mesh size.

The second thing is, that the shell elements in Karamba have no in-plane rotational stiffness. In case of flat shell patches it is sometimes necessary to lock the rotation of one node about an axis perpendicular to the patch.

Your shell is very thin (1cm) relative to its span. That is the reason why it does not compute for some mesh settings.

Best,

Clemens

Comment by Michel Cassagnes on March 28, 2013 at 4:33pm

Dear Clemens,

Thanks for your answer. I modified the file to have loads at the upper nodes. Result on princ stress directions is the same. What do I make wrong ?shell_test.gh

Best regards,

Michel

Comment by Karamba3D on March 26, 2013 at 2:15pm

Dear Michel Cassagnes (four posts below),

the shell structure you analyze in shell_test.gh is essentially a simply supported beam. If the loads would be placed only at the upper nodes of the structure the first principal stresses on the bottom would be aligned with the boundary there and the second principal stress would be zero and at right angle to the boundary.

The fact that there are loads on all points of the structure makes the first  principal stress in the center of the bottom triangles deviate from the horizontal direction.  

Best,

Clemens

Comment by Giada Schioppa on March 23, 2013 at 1:14pm

Hi, I have a problem when I try to install karamba on my pc.

I have Rhino 4, my pc is 64bit  resolution and I have grasshopper (december updated). When I've installed it, the plugin doesn't appear on the grasshopper screen. Why?

Which version should be ok for me? I tried a lot of version of karamba but they did'nt work. Well, before the updating (with the previous version of karamba) it worked.

thank you

GS

Comment by Mahdi Soheyli Fard on March 22, 2013 at 4:11pm

Hi Adam,

welcome to Karamba,

you can figure out what all you need by checking out the examples below:
http://www.karamba3d.com/category/examples/

by any kind of analysis, if you check the model rendering to figure out the Utilization or Displacement, you can handle the structure you've designed, and absolutely the definition you've written is important also,
so just write down a path-controled defining for your elements (as there are few examples with this solution in the link above) to find out the point you looking for.
Good Luck Buddy!

Comment by Adam Castelli on March 22, 2013 at 3:36pm

Hello. I am new to using karamba so I am fairly unfamiliar with how the components work. I am interested in using karamba to evaluate stresses for various surface forms, and then using the results to place more, or larger, structural members where there are the highest stresses. Is there a good example file for how to do this? Or can anyone point me in the right direction? Thanks.  

Comment by Michel Cassagnes on March 14, 2013 at 12:10pm

Hi Clemens,

I don't understand Princ Stress results. I made a simple wall loaded in its plane, downwards loads on each mesh. I expected to have princ Stress nearly horizontal at bottom and top of wall. Instead I get something that seems to depend on triangle orientation : see attached. gh file attached also.

Thanks for your help.

Michel

wall01-princStress.JPG

wall01-Supports_Loads.JPG

shell_test.gh

Comment by Karamba3D on February 25, 2013 at 3:51am

Tony: thank you for uploading the video.

Best,

Clemens

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