Punch through force

I am trying to figure out how to get the punch through force of an object. However, the data that I have pulled up have all contradicted each other.

Basically, How much force (in tons) is needed for an circular disc to be punched through Aluminum 7075.

What I have already came up with is:

P= (LTS)/2000

P=Press tonnage
L=circumference of circle
T=thickness
S=material strength in (ultimate tensile strength)


If anyone has any thoughts about this, could you please get back to me on this!

Thank you!
 

Bystander

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Think about the "failure" mode of the material you're punching; is it tensile, compressive, torsional, shear, or what, and then pick a modulus.
 
Thanks!

Thank you Bystander,

It was ultimate tensile strength, for a certain aluminum.

Strength (psi) x Area = pressure(pounds)
 

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