How can I do collapse test ?

I'm gonna fabricate a pavilion with my friends.

I just wonder the pavilion in my computer can be installed.

Even very simple solution is okay.

Karamba or Kangaroo ?

Or... any idea ?

Thanks in advance.

Replies to This Discussion

Permalink Reply by Hannes Löschke on December 18, 2013 at 2:48am

Karamba. But that also depends on how your pavilion is made. Most difficult part is probably to simulate the behaviour of your element joints. By default, Karamba geometry is joined by "welding". You can override that but this can lead to unsolvable situations. So first see if your connections can be thought of as being similar to a welded joint and then take karambas results with a grain of salt.

Permalink Reply by Digit on December 18, 2013 at 3:02am

Thanks to quick reply Hannes :D !!

In fact, it's like waffle structure.

But karamba is more likely about the "Segmented line" I think.

Waffle structure is not about the "line" ....

So I just wanna get simple test result with little expectations.

Thanks again, Hannes !

Permalink Reply by Hannes Löschke on December 18, 2013 at 4:43am

You could approximate the waffles with a grid of beams or you could directly simulate the waffles as shells.

The free version is pretty limited for those kinds of projects though...

Kangaroo is lines only, doesn't perform stress or deformation analysis on it's own and the input/output units are not documented, as far as I know. So even from the deformed model it would be hard to tell how the real structure would behave.

Permalink Reply by Daniel Piker on December 18, 2013 at 5:01am

Hi Hannes,

There is some documentation of the units used and performing stress analysis with Kangaroo here:

http://www.grasshopper3d.com/xn/detail/2985220:Comment:717587

http://www.grasshopper3d.com/group/kangaroo/forum/topics/getting-sp...

I'm also working on some new 2D and 3D finite elements - hoping to have something ready to release early next year.

Permalink Reply by Digit on December 18, 2013 at 5:41am

Thanks a lot Daniel !

It's so nice information to me !

Permalink Reply by Hannes Löschke on December 18, 2013 at 6:33am

Thank you Daniel,

just how time flies... I haven't been working with Kangaroo for more a year now, more like two. So I obviously missed that. From my very first tests with kangaroo I saw stiffness values way higher than I would have expected for typical materials (assuming 210 GPa for steel) and larger values would very likely "explode" the model.

I guessed it had to do with numerical stability but had no idea how to make it work.

Thanks to your link now I know. :D

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