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Homework Help: Bending stress + bending moment

  1. May 15, 2010 #1
    1. The problem statement, all variables and given/known data

    A steel strip of breadth 50 mm and depth 3 mm needs to be bent around a drum of diameter 4 m. What bending moment is required and what will be the maximum stress produced? The modulus of elasticity of the steel is 210 GPa

    2. Relevant equations

    [tex]
    \frac{M}{I} = \frac{\sigma _b}{y} = \frac{E}{R}
    [/tex]

    3. The attempt at a solution

    I'm able to find the bending moment by finding the second moment of area...

    1.05 x1011 x 1.125 x10-10 = 11.8 Nm

    however i'm stuck on how to then go on and find the maximum stress
     
  2. jcsd
  3. May 15, 2010 #2

    PhanthomJay

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    Science Advisor
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    Gold Member

    You have already noted the formula that bending stress = My/I.......you just need to identify the value for 'y' where the bending stress is at its maximum.
     
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