How does Kevlar stops bullets?
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It acts a net and also disperses the round’s energy. The energy damages the armor spreading out amongst the hard or soft Kevlar. Redirecting the energy away from point of contact.
The amount of energy will still punch you under the Kevlar and do soft tissue damage but it is far less than not wearing the armor. You will likely still end up in the hospital if you catch a round in the armor. Plates limit more than just soft armor by fracturing and absorb substantially more.
Bonus info. Modern body armor was invented by a former marine who became a pizza delivery driver. He killed 3 men trying to rob him and created it to protect him while delivering pizzas. His demonstration for selling it was letting a buddy shoot him.
Kevlar is very hard to puncture, so it spreads the surface area affected by the impact out over it’s whole surface. It doesn’t make the energy of the bullet go away, but it does spread it out over a larger surface area so it can’t enter your body.
Kevlar stops bullets because it has an incredibly high tensile strength. Tiny little threads of Kevlar can withstand very high levels of force, similar to that of steel except much lighter. The Kevlar is woven into a thick pad of filaments, making the bulletproof vest. This means when the bullet hits the vest, it can’t pierce through the Kevlar (mainly true for pistol rounds which have blunt tips). The Kevlar stops the bullet, but not the kinetic energy. You end up with one hellova bruise, but that’s better than a bullet wound
It’s strong enough to not rip apart from the penetration force of a bullet. This allows it to catch the bullet like a net catches a soccer ball.
Kevlar is a synthetic polymer meaning that it’s made by humans by chaining many molecules together. Plastic is a polymer too but what makes Kevlar so strong is that the way it’s chained is that it’s coiled up in super long, super strong, and super flexible strands, so when a force is applied to a piece of Kevlar it can spread out that force by stretching and not breaking. So firing a bullet at a Kevlar vest is like bouncing on a trampoline, except the giant coils on the trampoline are molecule sized in the vest and there are billions of them.
So when a bullet hits a Kevlar vest, the reason it doesn’t penetrate the person wearing it is because in a microscopic area the vest does its best to just streeeeetch out and distribute the energy over to the next coil, and the next, and the next. Over a large area, you don’t feel a tiny bullet piercing your body — instead, you feel a bowling ball hammering into you. Most of the time, though, a Kevlar vest will only be able to absorb the energy one bullet; after that some of the strands will have broken and it won’t be evenly stretchy (and distribute the energy from coil to coil) anymore.
your body stops the bullet, the kevlar just spreads the impact out enough you don’t end up with a hole in you while doing so.
you are giving the bullet something to waste energy on before it reaches your skin and making it wider so it can’t poke into you as well
kevlar is very strong as a material and kevlar body armor is many layers of tightly woven fabric made of it. this results in (usually many) thick layers that are very hard to puncture.
the bullet might compromise a few of the top layers, but eventually it hits one it cannot and even the damaged layers deform the projectile and wastes it’s energy. once it hits a layer it doesn’t break through then as it hits the next layers it is getting wider and wider as the fabric wraps around it and slower and slower as it has to pull each layer unto the forming depression as it goes.
it still hurts like hell most of the time & sometimes even leaves a wound, but it is far better than just getting shot the old fashioned way.
Is possibile to use some non newtonian fluid to improve a body armor or will be too impracticable?
It seems most people don’t realize that kevlar normally will have a removable ceramic strike plate inside it.
So, kevlar can prevent lethal damage from a low caliber round or knife. But used in a combat scenario, they’re pretty not useful without a strike plate.
Worth noting kevlar bullet resistant armour only stops weaker handgun rounds and shrapnel. Ceramic or steel plates are used to protect against high velocity rifle rounds
If you’ve ever seen a vest after it’s been shot, all the fibers are unwound around the bullet like a little nest.. not like movies where the bullet sticks to the outside
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