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!