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Rosetta gauge for stress strain

  1. Nov 6, 2015 #1
    1. The problem statement, all variables and given/known data
    IMAG0119.jpg

    2. Relevant equations
    IMAG0110.jpg
    IMAG0117.jpg

    3. The attempt at a solution
    IMAG0114.jpg

    I'm trying to find the principal strain, then from that find stress. The poisons ratio should be around 0.3 for this experiment. My result is about 100 micro strain higher than what my class mates got. Can anyone see where I'm going wrong?
     

    Attached Files:

  2. jcsd
  3. Nov 6, 2015 #2

    JBA

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    In the first element of your calculation you give the result of : (348 + 18) /2 to be 357; the result should be 183.
     
  4. Nov 6, 2015 #3
    Amazing, I forgot to enclose the whole top line with brackets on my calculator and divide by 2. Thanks a lot for looking over it and seeing that.
     
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