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Critical load

  1. Jul 31, 2016 #1
    1. The problem statement, all variables and given/known data
    in the 3rd photo , i m having problem finding the critical load

    2. Relevant equations


    3. The attempt at a solution
    to find the critical load , we should use the maximum stress multiply by the area which is 5500(250MPa) , am i right ? why the author used 59.4MPa(5500) ? is it wrong ?
     

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  2. jcsd
  3. Aug 3, 2016 #2
    anyone can help ?
     
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