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Angle between principal stress and shear stress

  1. Aug 3, 2016 #1
    1. The problem statement, all variables and given/known data
    I know that an element that is subjected to max shear stress is 45 degree away from position of an element that is subjected to principal stress.I couldnt understand why the θ s= θ p -45 degree?
    Cant it be θ s= θ p +45 degree ?

    2. Relevant equations


    3. The attempt at a solution
    IMO, it can be both θ s= θ p -45 degree and θ s= θ p +45 degree
     

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  2. jcsd
  3. Aug 3, 2016 #2
    or i miss out something ?
     
  4. Aug 5, 2016 #3
    anybody here ?
     
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