Mises plasticity model with isotropic damage, nonlocal - MisesMatNl, MisesMatGrad

The small-strain version of the model is regularized by the over-nonlocal formulation with damage driven by a combination of local and nonlocal cumulated plastic strain,

$$\hat{\kappa} = (1-m)\kappa + m\bar{\kappa},$$ (47)

where $m$ is a dimensionless material parameter (typically $m>1$) and $\bar{\kappa}$ is the nonlocal cumulated plastic strain, which is evaluated either using the integral approach, or using the implicit gradient approach.