VH> The two key elements of penetration were stretch and tensile strength.
 VH> Kevlar has virtually zero stretch and a very high tensile strength.
 VH> When the bullet hits the vest, the threads of the vest neither stretch
 VH> nor break.  The bullet tries to carry these threads with it.

 VH> Now, none of this has anything to do with the material the bullet is mde
 VH> out of.  The bullet can be made of pure lead, or sintered tungsten.  It
 VH> makes no difference.  To penetrate a kevlar vest, you need velocity.
 VH> There is one exception to this -- kevlar cannot resist a sharp edge.  A
 VH> knife will cut right through a vest, just like through any other cloth.
A few years ago, a vest salesman was giving a sales pitch for his Kevlar vest 
and invited one of the attendees to try to stab him in the chest with a 
hunting knife.  The attendee did and killed the salesman deader than a 
mackeral.  As you point out, Kevlar can't defeat sharp points and edges.
Regards.  Cloyce.
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