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Theory Manual Version 3.6
 Subsubsection 5.6.5.4: Von Mises Stress Up Subsection 5.6.5: Constitutive Models for Damage and Yield Criteria Subsubsection 5.6.5.6: Maximum Shear Stress 

5.6.5.5 Maximum Normal Stress

For this criterion, the damage measure takes the form where is the maximum principal stress (under the assumption that the three principal stresses of are ordered such that ). To evaluate the damage surface normal, we may use Eqs.(5.6.5.4-4)-(5.6.5.4-5) where Here, is a unit vector along the principal direction of maximum normal stress (the eigenvector of corresponding to the eigenvalue ).
 Subsubsection 5.6.5.4: Von Mises Stress Up Subsection 5.6.5: Constitutive Models for Damage and Yield Criteria Subsubsection 5.6.5.6: Maximum Shear Stress