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Homework Help: Calculate the size of the cross section relating to tension

  1. Jan 25, 2012 #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.

    Tension limit = 3 tonnes
    Thickness = 15mm
    Cross Section = ????

    2. Relevant equations

    o = P/A or P = Ao

    P = total external force in newtons
    A = area of cross section in square millimetres
    o = stress in newtons per square millimetre

    3. The attempt at a solution

    I do not have clue where to start since i'm given a tension limit in tonnes. Tension is when two forces act in opposite directions causing the body to elongate. Now if i presumed that the tension needed to act directly downwards then it would be right to assume:

    3000 * 9.81 = 29430N

    Now im stuck, am i on the right track?

    Any help would be greatly appreciated

    Thanks, Joe
  2. jcsd
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