multi-curvature 2

I tried to find good way to make strong curvature. I made various slits patterns. From left, 50mm square, 50mm square with 45 degree angled, honeycomb and octagon, and then I compared them. All slits are 1mm width.













The result was different from my expectation. I expected 45 degree angled square was the strongest pattern, but it was the weakest. The strongest pattern was honeycomb. Square and octagon were almost same strength.
I have decided I am going to use honeycomb to make multi-curvature face.

I need to make some more experimental models...

I am still exploring forms and ways of making curvature. Actually, I made many experimental models in this project, and they helped me to develop ideas and to explore forms a lot. Sori Yanagi, who is know as a designer of Butterfly Stool, always makes many models in his design process. He can find many things through model making and develop his design. I have got similar experiences through this project.

trial model 03 (1:2)

I used X-board 'kraft'. I made 10mm square slits on the back side of side walls because these walls consist of not only vertical curvature but also horizontal one. I got good curvatures but they were not strong enough to support 150kg weight. If the squares are bigger, it could be stronger. I'll try to make some experimental models to know which size of square is strong to support weight and can make good curvature.

making multi curvature

From left side, peel off whole side paper, 1mm slits with 10mm square gap and 1mm slits with 15mm square gap. The peel off cardboard is very weak to support. 10mm square gap cardboard can make smoother curvature than 15mm one.

making curvature

I made 1mm slits with 9mm gap and 19mm gap, and then I curved the cardboard. If the gap between slits is less than the cardboard thickness, the cardboard is curved with smooth curvature. For keeping strength of cardboard, the slits should be on the inside of the curve which you want to make. If you make the slits on the outside of the curve, it is easy to break.

trial model 02 (1:1)

I used 5mm thickness cardboard. I changed the size height:350mm and width:400mm. I changed the handle design to compact size, so the size is good size for a carry bag now. However, this is still not strong enough to support 150kg weight because of 5mm thickness cardboard. I should make a model with 10mm thickness cardboard.

trial model 01 (1:1)

This is good size for a chair but too big for a bag. I need to reduce its size.
I used 2mm thickness cardboard, and it was not strong enough to hold weight.

trial model 01 (1:10)

idea development: mobile chair&bag 03

idea development: mobile chair&bag 02

idea development: mobile chair&bag 01