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Relevant moment of inertia

  1. Oct 17, 2008 #1
    Rectangular Beam-

    Cross section
    h - dimension in y direction
    b - dimension in x direction

    If with a uniform force acting on the beam in the negative y-dir, what is the relevant moment of inertia when modeling the deflection u(z): E I (d4/dz4)u =w?

    I believe it is bh^3/12, but I am not positive

    Thanks in advance for any help.
  2. jcsd
  3. Oct 17, 2008 #2


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    Science Advisor

    Yes, you are correct. You are listing the Second Moment of Inertia (Area), which deals with bending stress.
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