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What is the bulletproof mechanism of bulletproof vests and helmets?

There are two basic mechanisms for bulletproof vests and helmets: One is to eject the fragments formed by the fragmentation of the projectile body; The second is to release the kinetic energy of the warhead through bulletproof data. Hard bulletproof vests and steel bulletproof helmets are designed to provide bulletproof effects by ejecting bullets or fragments, or causing them to shatter and consu
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