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Theory Manual Version 3.6
 Subsubsection 5.8.1.2: Damage to Yielded Bonds Up Subsection 5.8.1: Theoretical Formulation Subsubsection 5.8.1.4: Damage Measures 

5.8.1.3 Strain Energy Density, Stress, and Damage

Recognizing that damaged (broken) bonds do not store free energy, the referential mixture free energy density in eq.(5.7.2-3) may be rewritten as where the bond mass fractions and are given in Eqs.(5.8.1.1-2)-(5.8.1.2-3) prior to, during, and after yielding of each bond family . Similarly, the mixture stress may be evaluated from eq.(5.7.2-4) as where the stresses are given by the standard hyperelasticity relation in eq.(5.7.2-4). These expressions may be simplified further when assuming that the functional form of remains the same for all bond families . Finally, the reactive mixture equivalent of the damage variable may be evaluated for elastoplastic damage as the fraction of all bonds that are broken,
 Subsubsection 5.8.1.2: Damage to Yielded Bonds Up Subsection 5.8.1: Theoretical Formulation Subsubsection 5.8.1.4: Damage Measures