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Homework Help: Young's Modulus/Poisson Ratio

  1. Jan 20, 2007 #1
    I need to determine Young's modulus and Poisson's ratio from the elastic stiffnesses for a cubic crystal that is being stressed along the x axis.
    It is initially L *w and goes to (L+delta L)*(w - delta w). Where w is along the x axis and L is along the y axis. How do I change stresses and strains along with lengths into elastic stiffnesses?
  2. jcsd
  3. Jan 21, 2007 #2


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    What exactly do you mean by ' L*w '? Do you know the stresses?
  4. Jan 21, 2007 #3


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    Looking into some elasticity book you'll find:

    -The change in volume of the cube is relationed to the poisson coefficient, such that for poisson coefficients 1/2 the body is incompressible.

    -The stresses, deformations, elastic modulii and poisson coefficient are relationed through the Hooke's law.
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