Zur Sprödbruch-Statistik bei der Ermittlung der Festigkeit von Brennstoffteilchen-Hüllschichten
Zur Sprödbruch-Statistik bei der Ermittlung der Festigkeit von Brennstoffteilchen-Hüllschichten
Two influences on characteristic strength values of brittle materials were investigated: - the specimen number which is limited in the laboratory by practical reasons, and - the procedure for fitting the Weibull formalism to experimental results. The study was performed with respect to the evaluatio...
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Personal Name(s): | Bongartz, K. |
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Schuster, H. | |
Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Kernforschungsanlage Jülich, Verlag
1976
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Physical Description: |
23, [15] p. |
Document Type: |
Report Book |
Research Program: |
Addenda |
Series Title: |
Berichte der Kernforschungsanlage Jülich
1291 |
Link: |
OpenAccess |
Publikationsportal JuSER |
Two influences on characteristic strength values of brittle materials were investigated: - the specimen number which is limited in the laboratory by practical reasons, and - the procedure for fitting the Weibull formalism to experimental results. The study was performed with respect to the evaluation of the strength of coatings of HTR-fuel particles under the assumption that the Brittle Ring Test is used for its measurement. Strength values following Weibull statistics were produced artificially to simulate experimental results. The applicability of the following methods was studied to get best fits of the Weibull parameters to these values: - the least square fit (LSF) assuming the existence of a non zero minimum strength $\sigma$u, - the LSF assuming $\sigma$u = O, - the McClintock method with $\sigma$u $\not=$ O, and - the Rowley method with $\sigma$u = O. If $\sigma$u $\not=$ O is postulated, non of these fitting methods gives reasonable results. If $\sigma$u = 0 is assumed the LSF and the Rowley method work satisfactorily. The relation of the scatter of strength values and Weibull parameter to the specimen number is determined. |