Failure theories Coulomb-Mohr

Failure criterion is based on Coulomb Mohr Strength Theory. The results of the simulation is shown in Figure 5 and 6. As can be seen in Figure 5, just above the working face, the stress of igneousrock is -0.15 X10-6 0.0 Mpa, and the stress of coal measure strata is -5.5 x 10 —5.0 x 106 MPa. The simulation also shows that stress gradient changes suddenly at the interface of strata separate obviously. 

The static failure theory for brittle materials has historically been the Coulomb-Mohr failure theory. A simple definition of a brittle material is that the ultimate compressive strength is greater than the tensile strength, >5 and the yield strengths are approximately eqnal to the nltimate strengths in tension and compression, = S and Cast iron, rock, and concrete are typical materials that are analyzed by... 

FIGURE 2.3 Coulomb-Mohr and modified Mohr static failure theories for brittle materials. 

The most common failure criterion for granular materials is the Mohr-Coulomb failure criterion. Mohr introduced his theory for rupture in materials in 1910. According to his theory, the material fails along a plane only when a critical combination of normal and shear stresses exists on the failure plane. This critical combination, known as the Mohr-Coulomb failure criterion, is given by... 

If a compression test is conducted on a brittle glassy amorphous polymer, at what angle would the fracture plane be oriented (Review the Mohr Coulomb theory of failure.)... 

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