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HiI've started a mechanics module and just wanted to know, what is

  1. Jan 21, 2009 #1

    I've started a mechanics module and just wanted to know, what is the difference between Young's Modulus ('e') and the E = Stress/Strain?


  2. jcsd
  3. Jan 21, 2009 #2
    Re: E

    None :)
  4. Jan 21, 2009 #3
    Re: E

    I had a feeling that was going to be the answer.

    One last question about 'E': is this the stiffness of the structure or is this a property of the material stiffness only?

  5. Jan 21, 2009 #4
    Re: E

    Depending on the type of structure, you would define stiffness with K = F/x, or an "effective" or "apparent" modulus.

    In the case of the modulus, a "black box" would enclose your structure and you would determine the properties of that "box," e.g., the cross-sectional area of the box when calculating force/area = pressure.
  6. Jan 22, 2009 #5
    Re: E

    Thanks for your help. I've got it now.
  7. Jan 22, 2009 #6
    Re: E

    Strictly speaking E is tensile stress/ tensile strain.There is a shear modulus(shear stress/shear strain) and a bulk modulus(bulk stress/bulk strain).
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