If you want to try it at home, mix cornstash with water (roughly 2 to 1) and create an Oobleck [1]. Guaranteed success with kids (and adults who remained young at heart).
Being used for skiers and mentions its use in body armor at the time (2010). I'm pretty sure I read an earlier article than that one as well, perhaps from 2006 or so but I can't find it.
I can't tell from this new article if they've improved the fluid, or the method of application to kevlar is the novel part.
I have a few-years-old pair of d3o motorcycling gloves; from the company that made the skier armor. It's not interwoven with kevlar, and I haven't "tested" it; but they have been around for quite a while.
Question: If it hardens when it is disturbed, does it mean that it hardens if the wearer runs, for example? This would mean you still can't properly armor joints...
I think the more force (or acceleration?) it undergoes the more it hardens. So hopefully running wouldn't affect it, but a fast moving projectile would.
500+MPH impacts are vary different than simple joint movements. Think of it like this, if you slowly move your hand though water you don't feel any resistance, jump off a bridge and hit it at 100MPH and the stuff might as well be concrete.
Shear thickening fluids have a non-linear relationship between shear rate and shear stress. Schematically, it's the green line in this graph [1]. By choosing your material carefully, you can minimize shear stress at 'running' speeds, and then sharply ramp it up to protect against faster projectiles.
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[ 3.0 ms ] story [ 58.2 ms ] threadIf you want to try it at home, mix cornstash with water (roughly 2 to 1) and create an Oobleck [1]. Guaranteed success with kids (and adults who remained young at heart).
[0] http://en.wikipedia.org/wiki/Non-newtonian_fluid
[1] http://en.wikipedia.org/wiki/Non-newtonian_fluid#Oobleck , http://www.google.fr/url?sa=t&rct=j&q=&esrc=s... , http://www.google.fr/url?sa=t&rct=j&q=&esrc=s... , http://www.google.fr/url?sa=t&rct=j&q=&esrc=s...
* Tilts the bottle
It doesn't come out.
* Taps the bottom
Still nothing.
* Tap tap tap...
Nope.
* TAP!
Ketchup ocean in my plate...
From this article, it has appeared that the problem was solved, since they mention that is a lot lighter and provides more freedom of movement.
Being used for skiers and mentions its use in body armor at the time (2010). I'm pretty sure I read an earlier article than that one as well, perhaps from 2006 or so but I can't find it.
I can't tell from this new article if they've improved the fluid, or the method of application to kevlar is the novel part.
and about a year afterwards they began talking about using the same as armour. just stuck in my mind as the kids show came first.
from 2003. http://www.youtube.com/watch?v=JkS1ymQ73oc&feature=relat...
from 2004. http://www.technovelgy.com/ct/science-fiction-news.asp?newsn...
Have a good day.
[1] http://en.wikipedia.org/wiki/File:Shear_rate_vs._Shear_stres...
D3o has been out for a while and some of the videos are really impressive.
https://en.wikipedia.org/wiki/D3o