simulating the inflation of any shape with kangaroo

dear,

i'm trying to simulate the inflation of any mesh using kangaroo (as daniel did here in the pic with a cushion)

the goal is, starting from a defined surface (planar or double curved), to simulate its behaviour under pressure and than under external loading.

this implies that the whole surface area(s) can not change during the form finding process (or the deformation should be really minimal). as a result, sometimes, we will have wrinkles. to understand where and why wrinkles appear would be an useful tool for architects of lightweight constructions.

in attach the definition developed by Daniel.

Daniel, i don't understand why, but if i run the simulation, my cushion appear really really symmetrical (no wrinkles at all!)

Moreover, how can i define the length of the inner string? that length can not change during the form finding process.

Attachments:

cushion_tie.3dm, 80 KB
cushion_tie.ghx, 250 KB

Replies to This Discussion

Permalink Reply by ANGELOS on October 14, 2011 at 6:45am

WORKS FINE:) THANK YOU.

The mesh has to be a triangulated mesh?

How could I use a quad mesh?

angelos

Permalink Reply by Roberto Maffei on October 14, 2011 at 6:48am

in most of the cases it works with the quadrangular too, isn't it? i manly use it with triangulated ones..

Permalink Reply by ANGELOS on October 14, 2011 at 7:01am

using a ellipsoid mesh it starts spinning round and moving away?

(How could one avoid this without using ancor points?)

Permalink Reply by Roberto Maffei on October 14, 2011 at 7:06am

the definition is applying forces normal to the surface. if the surface it is not symmetrical, more forces will be concentrated on a particular region. that's the reason why it flys away. i think there is no way to solve it starting from my that definition.

Permalink Reply by ANGELOS on October 14, 2011 at 7:24am

could you please post again daniels definition, not modified?

daniel also explains the difference of the modified one for triangles.

would you be so kind to look after the quadmeh definition?

angelos

Permalink Reply by Roberto Maffei on October 14, 2011 at 7:27am

the one of daniel is at the top of this post but i had some problems with it. i'll post here if i'll manage to came out with something useful for you! ciao

Permalink Reply by ANGELOS on October 14, 2011 at 4:12am

I just tried to handle your GH definition "cushion tie", posted by roberto, didn´t get it started.

In his answer given on may 16, 2011 he said he played around ?

So where could I found this definition working?

angelos

Permalink Reply by ANGELOS on December 7, 2011 at 10:05am

My fault,

didn´t consider installing mesh tools

Permalink Reply by Gabriel Áh on April 12, 2013 at 2:21pm

hello Roberto,

i tried to check your definition but as soon as i open it on gh, this error shows up, do you know what might be happening?

thanks

best,

gabriel

Permalink Reply by Gabriel Áh on April 12, 2013 at 2:24pm

also nothing seems to be happening...

Permalink Reply by Ukendt Kunstner on January 1, 2017 at 12:07pm

Hi! Thanks for sharing.

I also tried to experiment it with another mesh shape but it gives the following error : "1. Supplied index too high, no possible solution". Do you have any idea? I reduced the mesh to a very small value yet it still gives the same error.

Cheers,