why can’t kevlar stop rifle bullets even though it’s strong than steel on an equal weight basis?

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Ar500 steel plate can stop rifle bullets. In my brain I’m thinking like “well if kevlar is stronger than steel, then slab of kevlar of the same size of an ar500 plate should stop rifle bullets too”. Clearly it doesn’t and I don’t understand why

In: Engineering

36 Answers

Anonymous 0 Comments

Stopping pistol rounds and rifle rounds are very different things. Rifle rounds are moving much, much faster and are generally smaller in diameter. Kevlar vests are made of layers of woven fibers and work by catching the bullet and slowing it while preventing it from piercing the wearer. Hard body armor,steel and ceramic, both rely on being made of harder materials than the projectile and shattering the incoming round, with ceramic composite and similar armor they also catch the fragments, with AR500 it does not, and the bullet fragments fly off roughly parallel to the plate surface, this is what is typically called “spall”

Also AR500 is bad armor, doesn’t have NIJ ratings, is really heavy and can be generally defeated by 5.56 M193 ball out of a 20″ barrel within 100 yards.

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