标准编号：ISO 20501:2019
中文名称：精细陶瓷（高级陶瓷，高级工业陶瓷） 威布尔强度数据统计
英文名称：Fine ceramics (advanced ceramics, advanced technical ceramics) — Weibull statistics for strength data
发布日期：2019-03
标准范围
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.
This document is restricted to the assumption that the distribution underlying the failure strengths is
the two-parameter Weibull distribution with size scaling. 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.
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