ISO 20501:2019 精细陶瓷（高级陶瓷，高级工业陶瓷） 威布尔强度数据统计

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

本文件涵盖了单轴强度数据的报告，以及以脆性方式失效的高级陶瓷的概率分布参数的估计。将先进陶瓷的失效强度视为一个连续的随机变量。通常，许多具有明确几何形状的试样在明确定义的等温加载条件下发生失效。记录每个试样失效时的载荷。由此产生的破坏应力用于获得与潜在总体分布相关的参数估计。本文件仅限于以下假设，即失效强度的分布是具有尺寸缩放的双参数威布尔分布。此外，本文件仅限于主要承受单轴应力状态的试样（拉伸、弯曲、加压环等）。第6.4款和第6.5款概述了修正估计威布尔参数中偏差误差的方法，并计算了所有故障源于单一缺陷总体（即。e、 单一故障模式）。在故障源于多个独立缺陷群（例如竞争故障模式）的样本中，6.4和6.5中概述的偏差校正和置信限方法不适用。

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.

标准预览图