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Kevlar: A polymer plastic science can't explain?


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9 replies to this topic

#1 of 10 OFFLINE   Jeff Kleist

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Posted March 27 2003 - 02:02 PM

I was tuning into the 10PM news, and saw the last of Fox's "The Pulse" and heard the Plastic Person Shepard Smith say that because a British soldier got shot in the helmet 4 times and it didn't die

As far as I know, science CAN explain it, and can do so very easily. Isn't Kevlar similar to teflon in how it's slippery, so the bullets glance rather than penetrate?

#2 of 10 OFFLINE   Mike Lenthol

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Posted March 27 2003 - 02:35 PM

I heard that too. Guess my eye brow wasn't the only one raised Posted Image

#3 of 10 OFFLINE   JayV

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Posted March 27 2003 - 02:36 PM

There are two type of body armor.

1. Hard (like helmets) armor. What is a mystery to Shepard, as you pointed out, is not a mystery to others: it works by deflection -- although I don't believe its "slipperiness" is a factor, at least surely no more so than steel. Besides, it's definitely not slippery to the touch. Because the Kevlar is still a weave in helmets (although bonded to other stuff) I don't know whether this also affords protection from blunt trauma.

2. Soft body armor: Soft body armor made with KEVLAR® works by "catching" a bullet in a multilayer web of woven fabrics. The engaged fibers absorb the energy of the impact and disperse it to other fibers in the fabric weave. This transfer of energy occurs at "crossover points," where the fibers are interwoven. Additional energy is absorbed by the other layers in the body armor, reducing the amount of transferred energy that causes "blunt trauma." Dupont Kevlar FAQ

-j

#4 of 10 OFFLINE   Grant B

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Posted March 30 2003 - 05:26 AM

Quote:
a British soldier got shot in the helmet 4 times and it didn't die


'It ' is a he or she if still alive.

I read an article a while ago that mentioned all these everyday things that science can not explain... things like water droplets. Cant think of the others but you would be suprised.
I think when they say that they cannot explain it either at an atomic level or in scientific notation
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#5 of 10 OFFLINE   Lee L

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Posted March 30 2003 - 07:28 AM

It was a He. I saw a picture and he was quite lucky as the hits were all about an inch above the edge of the helmet just above his left eye.

What is so mysterious about water droplets?
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#6 of 10 OFFLINE   Grant B

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Posted March 31 2003 - 04:26 AM

Nothing except science cant explain them
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#7 of 10 OFFLINE   David-S

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Posted March 31 2003 - 05:13 AM

Can't explain what about them?
link to article?

#8 of 10 OFFLINE   MickeS

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Posted March 31 2003 - 05:22 AM

Shepard Smith is the plastic science can't explain. Posted Image

/Mike
/Mike

#9 of 10 OFFLINE   Jeff Kleist

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Posted March 31 2003 - 05:53 AM

hahaha

#10 of 10 OFFLINE   EdR

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Posted March 31 2003 - 12:05 PM

I assume it depends on what kind of explanation you are asking for. Maybe it's the particular shape a water droplet of a particular size has, or how it deforms in real-time as it falls through air. Simply saying that 'science can't explain a water droplet' isn't really saying much at all.

Also, just because science can't explain something says nothing about whether the phenomenon in question is one based solely on physical properties. For instance, predicting the exact trajectory of a pinball based on initial conditions is not possible after you pass 3-4 bounces. It's simply too demanding a task for any present-day calculating device. But few rational people would suggest that the motions of a pinball aren't 100% goverened by physical properties.