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Homework Help: Strength of Materials

  1. Apr 25, 2007 #1
    1. The problem statement, all variables and given/known data

    In the attachment

    2. Relevant equations

    3. The attempt at a solution

    I have been solving this question for quite some time but I cant get the answer yet.
    I offset all the forces to point C and I get the following values:
    Moment at y-axis, M(y) = 10Nm
    Moment at z-axis, M(z) = 48Nm

    Stress at x-axis = -M(z) x (21mm) / I = -20MPa
    Stress at z-axis = 0

    Shear stress at xz plane = Tc/J
    = (40Nm) (21mm) / J
    = 8.33MPa
    By applying the following equations to get the principle strain,
    tan(2theta)=2(Shear stress at xz plane) /(Stress at x-axis - Stress at z-axis)

    I cant get the correct answer.

    Can anyone help me? Thanks in advance.

    Attached Files:

    • Q4.JPG
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    Last edited: Apr 25, 2007
  2. jcsd
  3. Apr 25, 2007 #2


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    Homework Helper

    Did you check your units?
  4. Apr 25, 2007 #3
    Yes i did...Is my way of doing correct?
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