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:
s1
≥ sTensileLimit 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