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

Question

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

Answer 1

“Per pound” a 30# Kevlar vest might would but it’d be YUGE!
The idea is making structural pieces the weight the kevlar beam can hold up when it weighs just a couple pounds is equivalent to what would require many, many more pounds of structure if made of steel.