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  • ASTM
    C1239-00(2005) Standard Practice for Reporting Uniaxial Strength Data and Estimating Weibull Distribution Parameters for Advanced Ceramics
    Edition: 2005
    $103.58
    Unlimited Users per year

Description of ASTM-C1239 2005

ASTM C1239-00(2005)

Historical Standard: ASTM C1239-00(2005) Standard Practice for Reporting Uniaxial Strength Data and Estimating Weibull Distribution Parameters for Advanced Ceramics

SUPERSEDED (see Active link, below)




ASTM C1239

1. Scope

1.1 This practice covers the evaluation and subsequent reporting of uniaxial strength data and the estimation of probability distribution parameters for advanced ceramics that 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 failed 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 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. Section 8 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 8 for bias correction and confidence bounds are not applicable.

1.2 Measurements of the strength at failure are taken for one of two reasons: either for a comparison of the relative quality of two materials, or the prediction of the probability of failure (or, alternatively, the fracture strength) for a structure of interest. This practice will permit estimates of the distribution parameters that are needed for either. In addition, this practice encourages the integration of mechanical property data and fractographic analysis.

1.3 This practice includes the following:

Section
Scope 1
Referenced Documents 2
Terminology 3
Summary of Practice 4
Significance and Use 5
Outlying Observations 6
Maximum Likelihood Parameter Estimators for Competing Flaw Distributions 7
Unbiasing Factors and Confidence Bounds 8
Fractography 9
Examples 10
Keywords 11
Computer Algorithm MAXL X1
Test Specimens with Unidentified Fracture Origins X2

1.4 The values stated in SI units are to be regarded as the standard.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

C1145 Terminology of Advanced Ceramics

C1322 Practice for Fractography and Characterization of Fracture Origins in Advanced Ceramics

E6 Terminology Relating to Methods of Mechanical Testing

E178 Practice for Dealing With Outlying Observations

E456 Terminology Relating to Quality and Statistics

IEEE/ASTM?SI?10 American National Standard for Use of the International System of Units (SI): The Modern Metric System


Keywords

advanced ceramics; censored data; confidence bounds; fractography; fracture origin; maximum likelihood; strength; unbiasing factors; Weibull characteristic strength; Weibull modulus; Weibull scale parameter; Weibull statistics;


ICS Code

ICS Number Code 81.060.99 (Other standards related to ceramics)


DOI: 10.1520/C1239-00R05

ASTM International is a member of CrossRef.


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