Pisarenko-Lebedev criterion for heterogeneous materials

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

 

 

 

σ_A = 1/2 ⋅ (σ₁ + σ₂)

 

X = σ_u,t / σ_e,c

 

L = 0.7 (by default)

 

Where:

σ_{Pisarenko-Lebedev;HE}  – Pisarenko-Lebedev criterion for heterogeneous materials;

σ_i  – intensity of stress;

σ_A  – average stress (hydrostatic pressure);

σ₁  – principal stress;

σ_e,c  – ultimate compression;

σ_u,t  – ultimate tension.