Coulomb failure criterion

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The simplest relationship between shear stress (τ) acting parallel to a plane and normal stress (σ) acting perpendicular to the plane at the point of failure. The relationship σ = σo + τtanϕ, where σ0 is the normal stress after failure and ϕ is the angle of failure, implies that σ2 (see principal stress axes) does not affect brittle fracture strength.

Subjects: Earth Sciences and Geography.

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