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Homework Help: Modulus of Elasticity

  1. Feb 10, 2013 #1
    The engineering yield strength, the modulus of elasticity, the original diameter and final diameter of a wire are given. That wire is stretched and it diameter decreases. I am trying to find the engineering strain just before yield and the corresponding true strain.

    So I assume I will find that the engineering strain is equal to or very close to the true strain because their curves don't diverge, in my experience, until necking occurs but I have to show that is the case. I believe that the yield strength is at the yield stress so a good approximation would be the proportionality limit.

    My problem is that there are no specifics about the modulus elasticity. If it is young's modulus then I can find the lateral strain from hooke's law but then because I don't know the original or final lengths I don't know how to compare it to the true strain. Is there another law that I am forgetting about? Is hooke's law applicable for the longitudinal case?
  2. jcsd
  3. Feb 12, 2013 #2
    Young's modulus is another name for the modulus of elasticity. Hooke's law applies longitudinally, in addition to other axes.
  4. Feb 12, 2013 #3
    What do you mean by the "longitudinal case"?
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