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Mohr-Coulomb Criterion

For materials such as soils, stones and concrete, whose behavior is usually characterized by a strong dependence of the yield strength on the hydrostatic pressure, the corresponding description of plastic fluidity requires the introduction pressure sensitivity. Mohr-Coulomb yield criterion - classical An example of a pressure-sensitive law.

The Mohr-Coulomb criterion Φ(σ,p) is represented as six functions:

Φ1(σ,p)=σ13+(σ13) sinφ-2c(p) cosφ≤0

Φ2(σ,p)=σ23+(σ23) sinφ-2c(p) cosφ≤0

Φ3(σ,p)=σ21+(σ21) sinφ-2c(p) cosφ≤0

Φ4(σ,p)=σ31+(σ31) sinφ-2c(p) cosφ≤0

Φ5(σ,p)=σ32+(σ32) sinφ-2c(p) cosφ≤0

Φ6(σ,p)=σ12+(σ12) sinφ-2c(p) cosφ≤0

c(p) – hardening function (for ideal plasticity it is equal to cohesion c),

σ_i – principal stresses, φ – angle of internal friction.

The Mohr-Coulomb yield surface is a hexagonal cone:

Plastic potential Q(σ,p) has the same form as the plasticity criterion Φ(σ,p) except that the angle of internal friction φ is replaced by the angle dilatancy ψ ≤ φ.