*COMBINATORIAL RULE

Optional parameters

ALPHA

Set this parameter equal to $\alpha$ in the equation ${\mu }_{AB}=[1+\alpha (1-\frac{{\mu }_A}{{\mu }_B})]{\mu }_A$, where ${\mu }_A\le {\mu }_B$, to compute a friction coefficient for contact, ${\mu }_{AB}$, based on friction coefficients ${\mu }_A$ and ${\mu }_B$ specified as surface properties.

ANISOTROPY WEIGHTING

This parameter applies only if friction anisotropy is specified as a surface property.

Set ANISOTROPY WEIGHTING=BALANCED to specify a balanced weighting method for combining surface-based directional preferences for the anisotropic friction model.

Set ANISOTROPY WEIGHTING=PROPORTIONAL to specify an epsilon-proportional weighting method for combining surface-based directional preferences for the anisotropic friction model.

Set ANISOTROPY WEIGHTING=DOMINANT to specify the maximum-epsilon-dominant weighting method for combining surface-based directional preferences for the anisotropic friction model.