Cracks initiate when the principal tensile stress $\sigma_1$ exceeds the material's tensile strength $\sigma_t$. $$ f(\sigma) = \sigma_1 - \sigma_t \geq 0 $$ In QSC, the surface is polled for vertices satisfying this condition. To prevent immediate shattering, a "Weibull statistical variation" is applied to $\sigma_t$ based on vertex seed values, simulating microstructural defects.
Best for: Cracks along the fillet of a mold core or die. quicksurface crack
Combines organic "Free Form" surfacing with geometric primitives (planes, cylinders, cones) to build complex parts. Cracks initiate when the principal tensile stress $\sigma_1$
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