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Poisson's Ratio

  1. Oct 4, 2014 #1
    Hi, I'm wondering if someone can point me in the right direction with this question.

    A material has a modulus of rigidity of 100 GNm-2 and a Young's Modulus of 250 GNm-2. Calculate the expected value of Poisson's Ratio for the material.

    Poisson's Ratio is expressed as transverse strain / axial strain

    So how am I supposed to work this out when the only information I am given is what's above? Or am I misunderstanding the question?

    Any help would be appreciated

    Thanks

    Matt
     
  2. jcsd
  3. Oct 4, 2014 #2

    SteamKing

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    For isotropic materials, there is a formula which relates E, G, and poisson's ratio. It's in just about every strength of materials text ever published.

    For a quick refresher, look at this attachment:

    http://www.colorado.edu/engineering/CAS/courses.d/Structures.d/IAST.Lect05.d/IAST.Lect05.pdf

    Check out pp. 7 & 8.
     
  4. Oct 4, 2014 #3
    Thanks very much for that, I'll get reading!
     
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