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Tresca yield question?

  1. Jun 26, 2012 #1
    1. The problem statement, all variables and given/known data
    Hi there if you have something that has 3 principle stresses on it, 200MPa and 50MPa and one is a compressive stress, what is the largest value of compressive stress using the tresca theory when the yield stress is 300MPa?
    Many thanks



    2. Relevant equations



    3. The attempt at a solution
    s1-s3=syield

    so 200-s3=300

    or s3=-100MPa

    but max shear, t=(s1-s3)/2

    so t=(200+100)/2=300/2=150MPa
    I think i have done something wrong as i need a compressive stress which would be a negative answer
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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