According to the Rankine fracture criterion for fragile material,
it can be confirmed that the ceramic brick withstands a compressive stress equal to that obtained in the test pieces assayed.
All data were undergone to the statistical verifications [46]by Statistica 8.0 software program [47].
These involve a nor-mality analysis involving the D statistic (according to theKolmogorov–Smirnov test) and the W statistic derived from the Lil-liefors correction.
In all cases, these characteristic values guaranteethe results validity.