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Homework Help: Young's Modulus (tensile Test)

  1. May 4, 2012 #1
    1. The problem statement, all variables and given/known data

    Original Cross sectional area 24.63mm^2

    original diameter 5.6mm

    Gauge length 35.07mm

    Extension length of the point on the graph i have chosen: 0.25mm

    Force at 0.25mm extension 3500N (or 3.5KN)

    2. Relevant equations


    3. The attempt at a solution

    I have gone through numerous attempts trying to solve this equation, i believe i am a factor of 10 out, as using the above equation gives me 19.9 GPa but i can't for the life of me figure out where i am missing the extra digit.

    The materials are black mild steel and bright steel.

    I've uploaded the graph in case i've stated anything wrong, looking at the first 3 specimens. (second graph is irrelevant)

    Attached Files:

  2. jcsd
  3. May 4, 2012 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Hi Joe welcome to PF!

    Looks like yes, you are off by a factor of 10, so either your gauge length should be 350 mm or the extension is .025 mm. Perhaps the problem is mistyped.
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