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Problem with work

  1. Mar 23, 2008 #1
    hey guys i have tried this problem many times and cant figure out the answer. please help

    Heres the problem:
    Figure 12-56 shows the stress versus strain plot for an aluminum wire that is stretched by a machine pulling in opposite directions at the two ends of the wire. The scale of the stress axis is set by s = 5.50, in units of 10^7 N/m2. The wire has an initial length of 0.950 m and an initial cross-sectional area of 2.50 × 10^-6 m2. How much work does the force from the machine do on the wire to produce a strain of 1.90 × 10^-3?

    This is my work:
    And i get .124094.

    What am i doing wrong?
  2. jcsd
  3. Mar 23, 2008 #2
    Does anyone have any ideas?
  4. Mar 23, 2008 #3


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    It is unclear what is the Elasticity modulus or the slope of the stress - strain curve or the value of the strain at the given stress? You didn't attach a figure.
  5. Jan 13, 2012 #4
    I have a similar problem, my elasticity modulus (stress/strain) = 7E10.
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