On Fri, 12 Sep 2014 21:14:40 -0700 (PDT),
wrote:

I have some material I need to test for psi. I need to impact it in a way consistently to show difference between materials resistance to psi pressure. The manufacturer I work with demonstrates this with a center hole punch. But I'm looking for something a little larger in impact area and that has some way to set the psi impact. Any ideas?

A Rockwell tester does it with a diamond point while other testers do
it with a small ball.
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Cheers,

John B.