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Strain and force

  1. Oct 2, 2009 #1
    If I know only the length of the beam, the young's modulus, and the cross sectional area, is there an equation that I can use to determine what amount of force would be required to lengthen a beam by a specified amount? The force is being applied to the beam axially.
     
  2. jcsd
  3. Oct 2, 2009 #2

    FredGarvin

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    [tex]\delta = \frac{PL}{AE}[/tex]
     
  4. Oct 3, 2009 #3
    [tex]
    \P = \frac{deltaAE}{L}
    [/tex]

    Using this with
    delta=.4421207mm
    E=200,000MPA
    A=5776mm
    L=701mm
    The force is 728584640N
    Doesn't this seem like too much?
     
  5. Oct 3, 2009 #4

    FredGarvin

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    Science Advisor

    Check your units. Convert all of the mm to m.
     
  6. Oct 3, 2009 #5
    That's what I did. mm have prefix 10^-3
    and Mega pascals has 10^6
     
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