The Mohr-Coulomb stress criterion is based on the Mohr-Coulomb theory also known as the Internal Friction theory.
This criterion is used for brittle materials with different tensile and compressive properties. Brittle materials do not have a specific yield point and hence it is not recommended to use the yield strength to define the limit stress for this criterion.
- If ( σ1> 0 and σ3 > 0 ) then ( σ1 >= σTensileLimit )
- If ( σ1< 0 and σ3 < 0 ) then ( σ3 >= -σCompressiveLimit )
- If ( σ1>= 0 and σ3 <= 0 ) then ( σ1 / σTensileLimit + σ3 / -σCompressiveLimit >=1 )