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Theory Manual Version 3.6
 Subsubsection 5.6.5.8: Maximum Normal Lagrange Strain Up Subsection 5.6.5: Constitutive Models for Damage and Yield Criteria Section 5.7: Reactive Plasticity 

5.6.5.9 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 5.6.5.8: Maximum Normal Lagrange Strain Up Subsection 5.6.5: Constitutive Models for Damage and Yield Criteria Section 5.7: Reactive Plasticity