Ceramic Failure Stress

Bi axial failure criteria for different weibull parameters.

Ceramic failure stress.

Multi axial loading there is a multi axial state of stress in many ceramic components. Kingery ceramics division department of metallurgy massachusetts lnstihrte of technology cambridge massachusetts the sources and calculation of thermal stresses are considered together with the factors in volved in thermal stress resistance factors. Ceramic materials are brittle. They are strong when loaded in compression but weak when loaded in tension.

Now let s look at a surface crack in a ceramic. Therefore a failure criterion has to be applied to predict the failure load from material data fig. Mohr s hypothesis for bi axial loading. So instead of the material blunting the surface crack as occurs in metals in a ceramic the stress from the crack ends up concentrated at the point of the crack.

Obtained from uni axial tests. Properties affecting thermal stress resistance of. Failures in ceramic materials often occur when a tensile stress causes a fracture to propagate through the material. Factors affecting thermal stress resistance of ceramic materials by w.