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Effective strain

  1. Nov 19, 2008 #1

    I need some help here. I'm an MEng Materials with no full background in engineering. So I'm in a bit over my head.

    I'm trying to understand the concept of hydrostatic stresses and effective strain in connection to worn surfaces. I am told I just need to know the equations but then I'm a bit confused.

    I'm trying understand how equivalent strain is calculated from the shear angle of the interface θ.

    In other words how this equation came about

    E (Z) = (square root of 3/3) * tan theta

    Can anyone please guide/help me?

    Last edited: Nov 19, 2008
  2. jcsd
  3. May 18, 2015 #2
    Stress is the ratio of applied force to the perpendicular area and strain is the ratio of. Change in length divided to the original length!! What about the strain of a steel?
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