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Theory Manual Version 3.6
 Subsubsection 5.6.5.7: Drucker Shear Stress Up Subsection 5.6.5: Constitutive Models for Damage and Yield Criteria Subsubsection 5.6.5.9: Octahedral Lagrange Strain 

5.6.5.8 Maximum Normal Lagrange Strain

The Lagrange strain tensor is related to via eq.(5.6.3-2). Its maximum principal value is denoted by . For this criterion, we let Then, the damage surface normal is given by where is a unit vector along the principal direction of normal strain.
 Subsubsection 5.6.5.7: Drucker Shear Stress Up Subsection 5.6.5: Constitutive Models for Damage and Yield Criteria Subsubsection 5.6.5.9: Octahedral Lagrange Strain