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Punch through force

  1. Jul 19, 2004 #1
    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!
     
  2. jcsd
  3. Jul 19, 2004 #2

    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.
     
  4. Jul 23, 2004 #3
    Thanks!

    Thank you Bystander,

    It was ultimate tensile strength, for a certain aluminum.

    Strength (psi) x Area = pressure(pounds)
     
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