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Homework Help: Is it possible to solve this question on cross sectional area / tensile strength ?

  1. Jul 21, 2011 #1
    1. The problem statement, all variables and given/known data

    A medium carbon annealed steel rod has a rectangular cross section and must cope with a tension of 3 tonnes. The thickness of the rod is 15mm. Calculate the size of the cross section.

    2. Relevant equations

    ???? The only formula I know with CSA and force is: stress = Force / Area ????

    3. The attempt at a solution

    I've not yet worked out a way to even attempt an answer...
    I know the load is 29430N (3000 x 9.81) but I'm not sure how to evolve this into useful data!?

    Can this be solved with this level of info??
     
  2. jcsd
  3. Jul 21, 2011 #2
    Re: Is it possible to solve this question on cross sectional area / tensile strength

    If the rod is in direct tension, then stress = force / area. You will need to determine the "allowable stress" of annealed steel. A good starting point for tension is allowable stress = 60% X Yield Stress. You can solve for the unknown length of the rectangle.
     
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