Esquisse Three - 'Locking Systems'

Exploring material and the strength of 'locking' systems.

Aim:
To create a 1:1 unique 'locking' system using only a 600 x 600mm piece of cardboard, B flute 3.2mm, (no glue or fixings) which is strengthened under load with a minimum height of 200mm. It should rely on geometry using minimal material and hold up to 100kg.

Outcome:
This process included a series of testing and adjusting. I began with a small 1:2 model which was very simply and easily held half the required weight.



After reconstructing the model at 1:1 in exactly the same design as the 1:2 model, I very quickly discovered that there were a few weak points at the top.

I then added in an extra internal support system which made it a bit stronger.



I then tested it with the weight of around 60kg and at this point I was very happy with the design and the result as it held quite easily.



When I tested it with the required weight of approximately 100kg once again it began to give way at the front and top. I was quite shattered at this point.

I then made more adjustments with more structural supports and a new way of 'locking' it all together.



It was tested for a final time and successfully held together. It wasn't as strong as I would've liked it but it didn't give in or collapse.

(It looks like it's bending at the front a little but that bend was made from a previous test so the cardboard was already damaged.)


From this esquisse, I've learnt that the bigger the surface, the weaker the strength and that folding is better than cutting.