Modelling Wood Bending Behaviours

Dear Grasshopper community, Im calling out to you to find out if there is any way of modelling the bending behaviours of wood.

Im currently researching the material property's of wood, spaciously plywood/ wood laminates, it is material research and so far all my experiments have been in the physical realm.

Im in the process of creating a malleable grid shell structure inspired by the Frei Otto grid shell roof membranes. The focus of my project is to combine skin and structure in one and for the system to be malleable in order to create a variety of different forms. once the desired shape is achieved the system could be tightened at different points in order to retain its shape.

The pictures represent a single lath member of the over all grid shell deforming by adjusting the actuating points, I have been able to model this in rhino in a static form but I wound love to know if there is any way I could recreate this bending beavers of this system in grasshopper ?

Any guidance or help would be greatly appreciated.

Thank you and cheers

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Replies to This Discussion

Permalink Reply by Hannes Löschke on February 10, 2014 at 2:39pm

If you already have an idea how to build your geometry in Rhino, all you need to do is translate your workflow into GH components. If you are not familiar with the components, either try to browse the tabs or work through some tutorials.

Be aware that deforming a curve while keeping the length constant is not a very simple task. This probably requires to use a generic solver like Galapagos or a physics simulator such as Kangaroo.

Permalink Reply by Kaveh Baradaran on February 10, 2014 at 2:46pm

Yes keeping the length of the system at a constant while deforming the points its the biggest challenge...

Permalink Reply by Kaveh Baradaran on February 10, 2014 at 3:39pm

so recreating this system is the digital realm is kinda impossible ?

Permalink Reply by Daniel Piker on February 10, 2014 at 3:50pm

absolutely not - It should be possible to model the system you show quite well using physical simulation. I'm not quite sure what Marcus means, but I think there is some confusion here. Springs are an ideal way of preserving lengths.

Permalink Reply by Daniel Piker on February 10, 2014 at 5:21pm

In the absence of opposing forces, the springs in Kangaroo will preserve their lengths exactly to within the same numerical accuracy as the rest of Rhino geometry. Here is an example of a bending curve relaxed in Kangaroo with lengths preserved by springs:

note that if the curve was a meter long, the change in length shown here is less than the radius of a helium atom. I think before we reach that point we can worry about other sources of inaccuracy in our model.

Permalink Reply by Tom Svilans on October 1, 2015 at 4:55am

Hi Daniel,

Any chance of showing how this could work with Kangaroo 2? Or are things like this still better done with the older version? Apologies in advance, I'm not yet up to speed with the state of things!

Permalink Reply by David heaton on November 23, 2015 at 2:40am

Hey All,

This is something I have been interested in learning as well. I worked with bending wood strips in the past and was able to simulate bending and rotation or twisting, but it was mostly done through ratios and math to simulate what was happening in real life. I have also, been unable to find basic tutorials for bending in Kangaroo 2. If there is an update on this, it would be greatly helpful!

Thanks,

David

Permalink Reply by Nick Bruscia on January 22, 2016 at 2:50pm

Hi Dave,

Just thought I'd spend a few minutes tinkering with Daniel's example in both versions.

I'm not quite sure why v2 (in black) produces a different result from v1 (in white), but anyway, here's a start.

Permalink Reply by Anand Shah on January 18, 2018 at 12:10pm

Hi,

I tried this with individual curves and it works perfectly fine, can you help me if it could be done with a grid of overlapping curves. I want to simulate bending of a gridshell.

Any sort of help would be very useful.

THANKS A LOT!!

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Permalink Reply by Daniel Piker on February 10, 2014 at 3:55pm

Nice models! One nice place to start could be the blog of Mårten Nettellbladt, who has conducted extensive investigations into modelling the bending behaviour of strips in Grasshopper:

http://thegeometryofbending.blogspot.co.uk/

Permalink Reply by Kaveh Baradaran on February 11, 2014 at 4:07pm

Thank you for your reply's everyone, i feel like trying to achieve modeling this is way beyond my knowledge right now. Im a beginner at grasshopper and have no idea how to use kangaroo and Galapagos. If you know anyone that would like to partner up with me and work with me to try to figure out how to do this I am willing yo hire them for their help and include them as part of the project in the publications of the thesis.

so let me know if you or anyone you know are interested in this offer.

cheers

Permalink Reply by Tom Svilans on October 1, 2015 at 4:58am

Hi Kaveh,

Very late reply here... but I am very interested in this and how you get on with it. Beautiful models. I'm involved in a project that's working with lamination and live bending of wood, so I'm also exploring the possibility of using Kangaroo to simulate some forms. Good luck and I hope to see more!

I also noticed you are / were at Carleton! I did my B. Arch. there a little while ago and still visit some of the folks there from time to time.

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