<CRITERION> mises

Description

This criterion is the classical energy equivalent form due to von Mises. Here the effective stress is calculated based on the \(J_2\) stress invariant:

(360)\[f_{cr} = \left[\frac{3}{2}\hat{\ten \sigma}:\hat{\ten \sigma}\right]^{0.5} - R\]

(361)\[\ten n = \frac{3}{2}\frac{\hat{\ten \sigma}}{f_{cr}}\]

Example

**potential gen_evp ev
  *flow plasticity
  *criterion mises
  *isotropic constant R0 300.