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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:

s1sTensileLimit  if s1 > 0 and s3 > 0

s3  ≥ - sCompressiveLimit  if s1  < 0 and s3 < 0

s1  / sTensileLimit + s3  / -sCompressiveLimit ≥ 1  if s1 ≥ 0 and s3  ≤ 0

The factor of safety is given by:

Factor of Safety (FOS) = {s1 / sTensileLimit + s3  /- sCompressiveLimit} (-1)

Related Topics

Performing factor of safety check

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