Theory Manual Version 3.4
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Subsubsection 5.6.5.7: Maximum Normal Lagrange Strain Up Subsection 5.6.5: Constitutive Models Section 5.7: Hydraulic Permeability

#### 5.6.5.8 Octahedral Lagrange Strain

The octahedral Lagrange strain is given by where is the deviatoric part of the Lagrange strain tensor, and is given in Eq.(5.6.3-2). For this damage measure we let The damage surface normal can be evaluated from where we used and

Subsubsection 5.6.5.7: Maximum Normal Lagrange Strain Up Subsection 5.6.5: Constitutive Models Section 5.7: Hydraulic Permeability