What thickness of Kevlar sheet would be required in the following example?
Oct.06, 2011 in
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If a bullet (such as a 7.62 x 39mm rifle bullet or a 12 ga. shotgun slug) were fired into a hollow sheet metal cube (such as a locker), what thickness of Kevlar sheet would have to be on the opposite side of the cube to stop continued travel and penetration of the projectile?
To better clarify this question … the Kevlar would be “sandwiched” between the “sheet metal cube” and a cinderblock wall. The Kevlar have be used to protect everything that is behind the “sheet metal cube”. The “sheet metal cube” can be sacrificed, the items behind the “sheet metal cube’ cannot be sacrificed.
Also, the projectile would be fired at point blank distance using hunting or military surplus ammunition out of a firearm with an average of 20″ barrel.
Tags: bullet, cube, example, kevlar, Metal, metal cube, penetration, projectile, rifle, rifle bullet, sheet, sheet metal, shotgun, Slug, thickness
October 11th, 2011 at 7:36 pm
You’d want the Kevlar sheet on the front side of a metal surface, not the back.
For a 7.62 * 39 you’d need probably 10 layers of Kevlar 49 (about 0.120″ thick).
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October 17th, 2011 at 7:36 am
You don’t give nearly enough information pertaining to specifical caliber, thickness of sheet metal, distance from muzzle to first sheet of metal, distance from one side of cube to other, or distance from cube to kevlar.
Every bullet has it’s own characteristics, and is going to react differently to impact. A SS109 5.56x45mm bullet is a very small projectile (only 56 or 65 grains on average) which travels at hyper velocities and can penetrate a 1″ thick steel plate at 100 yards. A .40S&W handgun round is a heavy (135-200 grain) projectile that relies more on weight than velocity to inflict damage, and would never penetrate a 1″ steel plate on it’s best day. A .50BMG round is incredible large and incredibly fast (for it’s size) and can put a hole in over 5″ of steel plate. A 12 guage slug is heavy and slow, and would slow and fall to the ground before it even made it 100 yards to a target.
You need to be much, much, much, more specific.
-Caliber of bullet
-Weight of bullet
-Composition of bullet
-Muzzle velocity
-Temperature
-Distance to each target
-Specific composition of each target, as well as thickness
And also, in addition, Kevlar is not intended to stop rifle rounds. Rifle rounds travel at much to fast of a velocity and are to narrow and pointed a projectile for kevlar to defeat. Kevlar is intended for larger calibers and slower velocitys such as 9mm lugar, 40S&W, 10mm, .45ACP more commonly associated with pistols and carbines.
And for that fact, queslisto can stand behind 10 layers of kevlar 49, I’ll be way the hell over somewhere else
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October 22nd, 2011 at 7:36 pm
Not enough information, besides what’s already mentioned, i.e. is the bullet armor piercing? You would need at least type III armor protection, which will not be just Kevlar. Maybe a combination of Kevlar and Ceramic material plates.
http://en.wikipedia.org/wiki/Bulletproof_vest
http://www.dupont.com/kevlar/europe/lifeprotection/milit_nft_set.html
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