Energy (Huber–Hencky–von Mises) criterion

Mises criterion is representing a critical value of the distortional energy stored in the isotropic material.
For energy criterion (Huber-Hencky-von Mises), analysis is performed according to the following formula:

or

Where:

σ_HH     – energy criterion (Huber-Hencky-von Mises);
σ₁, σ₂  – principal stresses;
σ_x        – normal uniaxial stress;
τ_y, τ_z    – shear stresses.