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ASTM C1239-2007 Standard Practice for Reporting Uniaxial Strength Data and Estimating Weibull Distribution Parameters for Advanced Ceramics

Standard Number:  ASTM C1239-2007
Title:  Standard Practice for Reporting Uniaxial Strength Data and Estimating Weibull Distribution Parameters for Advanced Ceramics
Language:  English
Replacing Standard:  ASTM C 1239-2006

Execute Date:  2007/2/1
Status:  Withdrawn
International Classification for Standards (ICS)GLASS AND CERAMICS INDUSTRIES>>Ceramics>>Other standards related to ceramics
CCS Classification for StandardsBuilding materials>>Ceramics, glass>>Special ceramics
Publisher:  American Society for Testing Material (ASTM)
Price:  
Number of Pages:19P.;A4   

Description:

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 Fig. 1). 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 isothermal, well-defined displacement and/or force-application 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 9 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.

  
Cross References:ASTM C1005;ASTM C1145;ASTM C127;ASTM C128;ASTM C1322;ASTM C125;ASTM C33;ASTM C702;ASTM D3665;ASTM D75;ASTM E100;ASTM E11;ASTM E178;ASTM E456;ASTM E6;IEEE/ASTMSI10  
File Format:  PDF(Acrobat Reader) or Word version doc Document
File Size:  994KB
Tile in English:  Standard Practice for Reporting Uniaxial Strength Data and Estimating Weibull Distribution Parameters for Advanced Ceramics

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