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Modulus of elasticity, problem. Graph and table.

  1. Mar 21, 2012 #1
    Attached is the graph and small part of table that i have chosen from the elastic range (first column extension, second column load) from a tensile test. I am trying to calculate youngs modulus of elasticity but cant seem to get a figure close to that of the common figure for the material

    Material 0.1% carbon steel
    Area = 20 x 10-6m2
    Yield force = 6009N
    Length increase at yield force = 0.537mm = 0.000537m
    Original length = 50.mm = 0.05m


    E = σ/ε

    E = (6006/20x10-6) / (0.000537/0.05)
    E = 27.96 x 109
    Typical value = 207 x 109

    Iv obviously went very wrong somewhere but i dont know where

    Thanks
     

    Attached Files:

  2. jcsd
  3. Mar 21, 2012 #2
    For a start, send again but include the units at every step (as is good practice).
     
  4. Mar 22, 2012 #3
    Are you certain that the original length of the wire was 50mm and not 50cm?
     
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