UNE-EN ISO 20501:2022

This document covers the reporting of uniaxial strength data and the estimation of probabilitydistribution parameters for advanced ceramics which fail in a brittle fashion. The failure strength ofadvanced ceramics is treated as a continuous random variable. Typically, a number of test specimenswith well-defined geometry are brought to failure under well-defined isothermal loading conditions.The load at which each specimen fails is recorded. The resulting failure stresses are used to obtainparameter estimates associated with the underlying population distribution.This document is restricted to the assumption that the distribution underlying the failure strengths isthe two-parameter Weibull distribution with size scaling. Furthermore, this document is restricted totest specimens (tensile, flexural, pressurized ring, etc.) that are primarily subjected to uniaxial stressstates. Subclauses 6.4 and 6.5 outline methods of correcting for bias errors in the estimated Weibullparameters, and to calculate confidence bounds on those estimates from data sets where all failuresoriginate from a single flaw population (i.e. a single failure mode). In samples where failures originatefrom multiple independent flaw populations (e.g. competing failure modes), the methods outlined in 6.4and 6.5 for bias correction and confidence bounds are not applicable.