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Homework Help: Mechanical properties: strain

  1. Nov 22, 2015 #1
    1. The problem statement, all variables and given/known data
    A copper rod of length l_0 at 0 C is placed on a smooth surface.Now the rod is heated up to 100 C.FIND THE LONGITUDINAL STRAIN DEVELOPED ?

    3. The attempt at a solution
    What I did :
    strain = delta l/ l_0
    = l_0 alpha(coefficient of linear expansion) delta T/l_0
    =100 alpha

    but surprisingly the answer is zero and the solution says since the "SURFACE IS SMOOTH".
    I have no clue why or how it works?
  2. jcsd
  3. Nov 22, 2015 #2


    User Avatar
    Science Advisor

    I agree with your answer. The given answer makes sense if the question asked for longitudinal stress, so it may be a typo.
  4. Nov 22, 2015 #3
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