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Desai Yield Surface, Parameters

  1. Dec 11, 2016 #1
    Hey guys,

    Desai Yield Surface:

    I have a hard time understanding the parameters of the model for soils. If I have three principle stresses, σ1, σ2, σ3. And R is defined as the Tri-axial strength in tension, how would I define R.

    Lastly can I just say that
    I1 = σ123
    J2= 1/6 * ((σ12)2 +(σ23)2+(σ31)2)
  2. jcsd
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