The class LiquidFractionMatLaw manages all liquid fraction evolution laws, specific to thixotropic materials. These laws are described below.

Careful: Only works if used with thixotropic materials (ThixoEvpIsoHHypoMaterial or ThixoTmEvpIsoHHypoMaterial).

Scheil law. $$ f_l = \left( \frac{T-T_s}{T_l-T_s} \right) ^{\frac{1}{r-1}} $$

Computes the effective liquid fraction $ f_l^{eff} $, excluding liquid entrapped inside solid grains, which does not contribute to the flow. Liquid fraction $ f_l $ is computed with Scheil law. Some liquid is released when bonds are broken, so $f_l^{eff} $ depends on the cohesion degree $ \lambda $.

$$ f_l^{eff} = f_l [1-\lambda(1-f_l)] $$