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Mohr-Coulomb Stress Criterion

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.

This theory predicts failure to occur when:

s 1 ≥ s TensileLimit  if s 1 > 0 and s 3 > 0

s 3  ≥ - s CompressiveLimit  if s 1  < 0 and s 3 < 0

s 1  / s TensileLimit + s 3  / - s CompressiveLimit ≥ 1  if s 1 ≥ 0 and s 3  ≤ 0

The factor of safety is given by:

Factor of Safety (FOS) = { s 1 / s TensileLimit + s 3  /- s CompressiveLimit } (-1)

Related Topics

Performing factor of safety check



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