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Computational Tool for Shaping Auxetic Materials

07/27/2016 8:01 AM

The big picture of a shoe caught my eye, but this article about shaping auxetic materials (from one of my alma maters) is of interest way beyond making shoes.

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#1

Re: Computational Tool for Shaping Auxetic Materials

07/27/2016 8:42 AM

Your link didn't show much for me... maybe my computer.

I have often wondered about pattern making in the clothier or shoe industry that would be similar to sheet metal unfolding routines where they take a 3D model.... like a proposed shoe, and unfold it.

Of course like in CADD, you still have to construction plan as your creating it for unfolding but with the clothing industry, you still have to have aesthetics playing the key roles. But the software lets you select materials (with their properties), types of stitching, heat sealing/gluing and such, that compensates for the materials needed.

I'm sure there's something out there. I just thought that would really enable to bring style or even fads to market so much quicker.

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#2
In reply to #1

Re: Computational Tool for Shaping Auxetic Materials

07/27/2016 9:09 AM
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#4
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Re: Computational Tool for Shaping Auxetic Materials

07/27/2016 3:55 PM

The old way of curving large diameter pipes: Cut a lot of "pie" sections, and weld them up. I think the art has improved its state immensely since 1940.

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#3

Re: Computational Tool for Shaping Auxetic Materials

07/27/2016 3:53 PM

Auxetic materials maybe could in fact make a spherical shape from a flat sheet, but it will never hold water! LOL ! OR will it - if the holes are small enough and the materials is hydrophobic enough, who knows, maybe the interfacial tension will keep water inside...

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#5
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Re: Computational Tool for Shaping Auxetic Materials

07/27/2016 4:55 PM

A wikipedia article mentions a number of Auxetic materials including a form of Goretex and graphene (is there anything it can't do?). Both would be capable of enough curve to hold some water - though there isn't enough info to say if a single flat sheet could be made into a complete sphere.

'Auxetic' is my new word for the week. Kind of like 'exotic', but turned inside-out -- which is rather fitting, so to speak.

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#6
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Re: Computational Tool for Shaping Auxetic Materials

07/27/2016 5:00 PM

Kinda makes you go hmmm....

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#7
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Re: Computational Tool for Shaping Auxetic Materials

07/27/2016 10:22 PM

Kind of my thoughts too. This is the first I've heard of these materials. Now, I'm sucked in to a bunch of internet research (and the plethora of rabbit trails I am sure to go off on) to understand how these actually work., but

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#8

Re: Computational Tool for Shaping Auxetic Materials

07/27/2016 11:34 PM

For some wider thinking, combine auxetic materials with kirigami (origami with scissors) thinking and apply to lightweight bullet resistance barriers and mining equipment developments. A bit more to google and discover.

https://www.researchgate.net/publication/235671877_Kirigami_Auxetic_Pyramidal_Core_Mechanical_Properties_and_Wave_Propagation_Analysis_in_Damped_Lattice

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#9
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Re: Computational Tool for Shaping Auxetic Materials

07/28/2016 4:58 PM

Now if we could just engineer this into a material that will stop an RPG, or cut it in half in a nanosecond....before it arms and impacts. (or vice versa).

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#10

Re: Computational Tool for Shaping Auxetic Materials

07/28/2016 7:48 PM

Conceptually, I could rationalize the shaping of (new-tech ?) materials to form, say, the (smoother/Higher-temperature-resistant/stress-resistant/stress-relieving/other) products to form the surface panels of, say, higher speed aircraft, but I don't see the value to humanity, as a whole, of making a (million-dollar) pair of shoes for a very few, very rich, (consumers), when much of the world has no choice but to go around essentially barefoot...

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#11

Re: Computational Tool for Shaping Auxetic Materials

07/29/2016 10:29 AM

A person with a laser cutter or water jet and a tig welder could have a ball with this. From a design standpoint, it appears the shoe was done with a triangular pattern with three legs and then the triangle is rotated to expand the local area. I could see waterjetting grid panels and then rotating the individual triangles to a predetermined rotation to get the 3d shape and then drop in and weld precut fillers for the openings generated by the rotation, or possibly something like metal spray or electroforming to fill the gaps. If preplanned right, everything could be done with CNC.

NEAT!

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