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ASTM C1239-06a

Historical Revision

Standard Practice for Reporting Uniaxial Strength Data and Estimating Weibull Distribution Parameters for Advanced Ceramics

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1.1 This practice covers the evaluation and reporting of uniaxial strength data and the estimation of Weibull probability distribution parameters for advanced ceramics that fail in a brittle fashion (see ). The estimated Weibull distribution parameters are used for statistical comparison of the relative quality of two or more test data sets and for the prediction of the probability of failure (or, alternatively, the fracture strength) for a structure of interest. In addition, this practice encourages the integration of mechanical property data and fractographic analysis.

1.2 The failure strength of advanced ceramics is treated as a continuous random variable determined by the flaw population. Typically, a number of test specimens with well-defined geometry are failed under well-defined isothermal forcing conditions. The force at which each test specimen fails is recorded. The resulting failure stress data are used to obtain Weibull parameter estimates associated with the underlying flaw population distribution.

1.3 This practice is restricted to the assumption that the distribution underlying the failure strengths is the two-parameter Weibull distribution with size scaling. Furthermore, this practice is restricted to test specimens (tensile, flexural, pressurized ring, etc.) that are primarily subjected to uniaxial stress states. The practice also assumes that the flaw population is stable with time and that no slow crack growth is occurring.

1.4 The practice outlines methods to correct 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 (that is, a single failure mode). In samples where failures originate from multiple independent flaw populations (for example, competing failure modes), the methods outlined in Section for bias correction and confidence bounds are not applicable.

1.5 This practice includes the following:

1.6 The values stated in SI units are to be regarded as the standard per IEEE/ASTM SI 10.


SDO ASTM: ASTM International
Document Number C1239
Publication Date June 1, 2006
Language en - English
Page Count 19
Revision Level 06a
Supercedes
Committee C28.01
Publish Date Document Id Type View
Sept. 15, 2024 C1239-13R24E01 Revision
Aug. 1, 2013 C1239-13 Revision
Feb. 1, 2007 C1239-07 Revision
June 1, 2006 C1239-06A Revision
Jan. 1, 2006 C1239-06 Revision
Oct. 10, 2000 C1239-00 Revision
July 1, 2018 C1239-13R18 Reaffirmation
June 1, 2005 C1239-00R05 Reaffirmation