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Homework Help: Help drawing Mohr's circle with rotated axis

  1. Mar 19, 2013 #1
    1. The problem statement, all variables and given/known data

    Plane stress in xy-plane. Use Mohr's Circle to find σx1 σy1 and τx1y1 if the XY axis is rotated counterclockwise θº

    I want to do my HW problem myself so I'll just put some sample values. If i know how to get this one, i'll know how to do the HW problem(s).
    (Units wont matter for this)

    σx = -45
    σy = -15
    τxy = -20 which makes τyx = 20
    θ = 100°

    2. Relevant equations
    R = √((σxy)/2)2xy2
    center=σave= (σxy)/2

    3. The attempt at a solution
    center=σave= {[(-45)+(-15)]/2} = -30
    Point A (-45,-20)
    Point B (-15,20)
    Using my book (Gere 8th), i was only able to get this far. Not sure if this is on the right track or not, but i'm stuck at this point. Don't know how to continue...
    How can I get σx1 σy1 and τx1y1 from here?
    Last edited by a moderator: Mar 19, 2013
  2. jcsd
  3. Mar 20, 2013 #2
    Problem Solved. I did it all by myself!
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