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Mohr-Coulomb Stress Criterion solidworks simulation

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.

The Mohr-Coulomb theory predicts failure to occur when:

  • 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 )
The Factor of Safery (FOS) is calculated by:
FOS = 1 / ( σ1 / σTensileLimit + σ3 / -σCompressiveLimit )

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