I have a ceramic crucible, which is pressed from the sides to hold the weight, for this material, which failure theory can be used from Ansys?
Mohr-Coulomb theory or Max Tensile Theory, which among two will be more accurate for failure prediction?
Presumably, "Mohr-Coulomb + cap" or a more advanced "Modified Cam-Clay" or similar "Granta gravel" are good enough for modeling brittle fracture of ceramics. However, it is not easy to find appropriate experimental parameters for these advanced models, that is why I would recommend pure Mohr-Coulomb.
Max principle stresses are generally better at predicting failure of brittle materials. The von Mises theory is suitable for predicting yield.
I recommend you check out CARES, a tool specifically developed to analyze ceramic materials: http://www.ceramicreliability.com/index.html
Since the material is brittle, I believe failure (rupture) would take place when the maximum principal stress induced exceeds the ultimate stress of the material.
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