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So a total of 50 layers of Kevlar? For reference 30 layers will stop a 44 Magnum at 436m/s. Resin impregnated Kevlar will be stronger than dry Kevlar (imagine coating it in super glue, that will give you an idea). Now there are two types of Kevlar, ballistics grade, and aircraft grade. Obviously ballistics grade sounds better for this application, but aircraft grade is about 1/5 the price, and when they are resin impregnated they are equally in strength.
decreasing the surface area of the plates would make the vest harder to move, because you cant decrease the thickness needed to stop a bullet. not only that, but it decreases the area of protection because there are more gaps.
You can buy Alumina (artifcial saphire) spheres quite cheaply - they dont need to be precision spheres.
Lay down some women kevlar sheet, add a layer of spheres, add more kevlar, more spheres, and so on. Then use a resin to bind it all together.
You will need to experiment to find the right size of spheres, the number of layers, and the number of layers of kevlar to lay between the spheres, but the composite should be very effective. You can also add hollow microspheres as a filler to reduce the amount of resin needed.
That makes no sense.. youd basically be making kevlar sandpaper. what happens to sand paper when you try to tear it, or if you poke it? it tears.
also adding hollow microspheres thickens resin, which is terrible for ballistic composites. You want a thin resin that inpregnates the fibers in a way that can be controlled as to have a much higher fiber to resin ratio, this also in turn reduces the thickness of the composite. Your idea is cool and all, and I commend you for thinking outside the box, but this is impossible with today's tech that a normal civilian can obtain, and that someone without proper scientific training, and a vast understanding of multiple disciplines of engineering.
I'm sorry but that is a completely different concept what you're referring to would not work that only works because it's using large diameter spheres of extremely hard ceramic (aluminum oxide is not artificial sapphire by the way) incased in a structural material with high toughness (it will not break apart and shatter after multiple impacts) the spheres only work because after impact they rearrange due to being free flowing like sand. If you incase them inside a resin and fiberous material then they completely lose that property, and they essentially become sand paper on strong fabric. This concept you are drawing inspiration from is impossible to use on a scale small enough for personal body armor. That is why it is used as structural ballistic armor.
dont pay attention to him, hes repeating vaguely what hes read on a website. the materials you would buy to make this would cost a lot of money, and it is much more involved then he is saying, and a different process, albeit similar.
my theory is when you make it try using epoxy, and slow drying gorilla glue, layer it onto a mold, use 3 thin and 2 thick layers of both one after the other, till you get to the last layer. Test it first with a dummy..
I hope you know that absolutely makes no sense. glue isn't anywhere near strong enough to even slow down a bullet.
My guess is that the person you responded to lives in the US. where steel ballistic armor is fairly common. It might require some paperwork in some states, but it's perfectly legal on a federal level, just like machine guns, suppressors, SBRs, and grenade launchers, though the four latter items all require a 4+ month background check process, a $200 USD tax stamp from the BATFE, and a small fortune.
Some cities have regulations on who can have armor and when, but that's fairly uncommon. We're not a police state yet.
FYI 20 + years ago a father and son I worked whith who reloaded their own hot rounds showed me some 3/4" steel with holes clear through it from hot loaded .280 rounds. I was simply amazed. The plate had craters of different depths till they got their rounds fast enough to penetrate the steel. I don't remember what sort of projectile, solid copper, bronze, or lead core, they were shooting. What became apparent to me was that if the velocity was really high it would penetrate things I wouldn't have imagined.
usCrow has a nice tutorial for two models of steel trauma plate: http://uscrow.org/2013/05/22/how-to-make-ballistic...
Ideally you want a durable carrier, either canvas or several layers of kevlar if you've got the budget, and a plate that can withstand at least six rounds of the largest style of ammunition you want your armor to face. Alternatively, you can install a series of thinner plates made to the same standard that act like a whipple shield and break up or deform heavier rounds to be absorbed by a backstop of kevlar while defeating pistol munitions. IIRC, the nastiest penetrator in small arms outside of the .50BMG would be a steel, tungsten, or depleted uranium core 7.62mm. I'm not even sure if you can buy the steel-core penetrators let alone get somebody in the military to test your plates with DU since uranium of any sort is a controlled substance.
Literally, the least you need for make body armor are some steel-working tools for cutting bending and grinding/polishing your plates, used motor oil for quenching and hardening after heating, bending, and cleaning your plates (ask your local auto shops if you can pay them to collect the stuff from their customers during regular oil changes), and 2/8" to 3/8" thick steel sheets.
If you want to get fancy, try the alumina beads idea or figure out how to cook up boron plates in your backyard, I've seen the industry vids on how they do it and it's like melting a fine sand of boron into one solid piece with a very high-temperature press.
way to treat your son, lol.
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Posted:Jan 31, 2009
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