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Mechanical Engineering Streeses

  1. Mar 24, 2007 #1
    Mechanical Engineering Stresses

    I am really struggling with the following problem:

    A rectangular tube with no given length has the dimensions shown in the diagram (within the attachment). Find the maximum tensile and compressive stresses that such a section will experience due to a bending moment of 20KNm.

    The attachment should be included if Ive done it right.

    I think i should be using "Second moments of area", but I'm not sure some clarification and possibly the formula would be gratefully received.

    Thank you


    Attached Files:

    Last edited: Mar 24, 2007
  2. jcsd
  3. Mar 24, 2007 #2


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    What's the definition (mathematical) of normal stress due to a bending moment?
  4. Apr 7, 2007 #3
    how is the bending moment applied? is the bar in torsion?
  5. Apr 8, 2007 #4
    That tube works as a beam. From here, Google is your friend.
  6. Apr 9, 2007 #5
    Last edited: Apr 9, 2007
  7. Apr 9, 2007 #6


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    think about the neutral axis and which side is in tension/compression then use the stress equation for a beam in symmetric (assuming) bending. simple. but I've done it a few times.
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