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: Axial stress of a beam

  1. May 6, 2007 #1
    I've got a sectional area of a beam that is subjected to an axial force N = -100 and momenst M(y) = -50 kNm and M(z)= - 120 kNm. I've found the centroid and the second moment of area around both axes.

    How can I compute the maximum axial stress?

    Here's the section: http://www.badongo.com/pic/624173

    I got the correct answer after trying Naviers formula several times:

    Max stress = N/A + (M(z)*y(max))/I(z) + (M(y)*z(maks))/I(z)

    What I don't understand is: Why is y(maks)=124 and not 151??
    Last edited by a moderator: Apr 22, 2017
  2. jcsd
  3. May 6, 2007 #2


    User Avatar
    Homework Helper

    Well, if you got the correct answer, you should ask yourself what ymax and zmax represent in your formula and compare them with your results.
  4. May 6, 2007 #3


    User Avatar
    Homework Helper

    Look at the stress distributions diagrams.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook