Fine ceramics (advanced ceramics, advanced technical ceramics) - Weibull statistics for strength data (ISO/DIS 20501:2026); German and English version prEN ISO 20501:2026
Abstract
This document covers the reporting of uniaxial strength data and the estimation of probability distribution parameters for advanced ceramics which fail in a brittle fashion. The failure strength of advanced ceramics is treated as a continuous random variable. Typically, a number of test specimens with 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 obtain parameter estimates associated with the underlying population distribution. The fundamental prerequisites for the use of this International Standard is that the failure mode is catastrophic from inherent microstructural flaws and that the distribution of the failure strengths is the two-parameter Weibull distribution function at considered length scales. Furthermore, this document is restricted to test specimens (tensile, flexural, pressurized ring, etc.) that are primarily subjected to uniaxial stress states. Subclauses 6.4 and 6.5 outline methods of correcting for bias errors in the estimated Weibull parameters, and to calculate confidence bounds on those estimates from data sets where all failures originate from a single flaw population (i.e. a single failure mode). In samples where failures originate from multiple independent flaw populations (e.g. competing failure modes), the methods outlined in 6.4 and 6.5 for bias correction and confidence bounds are not applicable.
Begin
2024-10-08
WI
00184297
Planned document number
DIN EN ISO 20501
Project number
06236815
Responsible national committee
NA 062-08-113 AA - Advanced ceramics; terminology and testing methods
Responsible european committee
CEN/TC 184 - Advanced technical ceramics
Responsible international committee
ISO/TC 206/WG 7 - Monolithic ceramics/ Physical, mechanical and thermal properties
draft standard
Fine ceramics (advanced ceramics, advanced technical ceramics) - Weibull statistics for strength data (ISO/DIS 20501:2026); German and English version prEN ISO 20501:2026
2026-12
Order from DIN Media
