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
The top answer is pretty sot on. The kevlar would need to be at least 6″ thick to stop rifle rounds, and that depends on what rifle round. AR500 abrasion steel is strong and breaks up the bullet on impact sending the bullet flying wherever it can. That is why you see some sort of polyurea spray liner (truck bed liner) on steel plates.
Ceramic actually has a higher hardness that steel, which is why all level IV plates (top level under NIJ 0101.06 standard) are all ceramic/composite. Of course this ceramic isn’t like your toilet or flower vase. It’s designed for armor. You’ll have a ceramic strike face with some sort of composite backer, typically a type of polyethylene. The ceramic breaks the bullet up and the polyethylene catches the broken pieces. There’s also different types of ceramic and many different types of polyethylene.
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