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
Kevlar (aramid) fiber has a very high tensile strength, meaning it is extremely strong when you pull it along the strong axis like a rope.
It has no flex resistance, so when you stab it the fibers just move aside and let the blade/pointy bullet through.
To combat this, ballistic vests will stack layers of aramid fiber and metal/ceramic plates that will blunt the tip of an incoming bullet.
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