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Finding shear and normal stress after rotation

  1. Jul 30, 2016 #1
    1. The problem statement, all variables and given/known data
    http://ocw.nthu.edu.tw/ocw/upload/8/256/Chapter_7-98.pdf refer to page 3
    in the 2nd, 3rd pictures, i have problem of finding σx'


    2. Relevant equations


    3. The attempt at a solution
    why cant use the formula to find σs ?
    it's given that σx' = ( σx+ σy)(0.5) + (0.5)( σx- σy)cos2θ + τxy(sin2θ)
    = (100+60)(0.5) +(0.5))100-60)(cos60) +52(sin60)
    =155
    But, the author found σx = 111.6 using Mohr's circle method, why i cant use this method? did i miss out something?
     

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  2. jcsd
  3. Aug 4, 2016 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
     
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