<CRITERION> tresca#
Description#
The plasticity threshold in Tresca criterion is linked to the maximum shear stress and is given by:
\[\frac{1}{2}\max_{i \neq j}\left(|\sigma_i - \sigma_j|\right)\]
The complete equation of the criterion can be written as:
\[f = \max_{i \neq j}\left(|\sigma_i - \sigma_j|\right) - \sigma_s = 0\]