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
Well, “stronger by weight” is not “stronger by volume”.
Google says AR500 plate is 3/8 in thick. Steel is 7.8 g/cubic cm. Kevlar is 1.4 g/cubic cm. So an equivalent weight of kevlar would need to be 5-6in thick. I bet 5-6in of kevlar would stop a bullet better than a 3/8 in steel plate, but it sure wouldn’t be wearable as a bullet-proof vest.
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