1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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)
    But, the author found σx = 111.6 using Mohr's circle method, why i cant use this method? did i miss out something?

    Attached Files:

    • 323.PNG
      File size:
      6.7 KB
    • 323.jpg
      File size:
      34.4 KB
    • 324.jpg
      File size:
      37.2 KB
  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?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted