Pisarenko-Lebedev criterion for heterogeneous materials

For Pisarenko-Lebedev criterion for heterogeneous materials, analysis is performed according to the following formula:

 

Pisarenko-Lebedev criterion for heterogeneous materials

 

Pisarenko-Lebedev criterion (sigma;i)

 

σA = 1/2 ⋅ (σ1 + σ2)

 

X = σu,t / σe,c

 

L = 0.7 (by default)

 

Where:

σPisarenko-Lebedev;HE  – Pisarenko-Lebedev criterion for heterogeneous materials;

σi  – intensity of stress;

σA  – average stress (hydrostatic pressure);

σ1  – principal stress;

σe,c  – ultimate compression;

σu,t  – ultimate tension.