Journal
ARCHIVES OF METALLURGY AND MATERIALS
Volume 61, Issue 3, Pages 1201-1208Publisher
POLSKA AKAD NAUK, POLISH ACAD SCIENCES, INST METALL & MATER SCI PAS
DOI: 10.1515/amm-2016-0253
Keywords
sintered structural steels; mechanical properties; Weibull statistics; maximum likelihood; threshold parameter
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Funding
- Polish Ministry of Science and Higher Education [11.11.110.299]
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A statistical analysis is presented of tensile and bending strengths of a porous sintered structural steel which exhibits non-linear, quasi-brittle, behaviour. It is the result of existing natural flaws (pores and oxide inclusions) and of the formation of fresh flaws when stress is applied. The analysis is by two- and three-parameter Weibull statistics. Weibull modulus, a measure of reliability, was estimated by the maximum likelihood method for specimen populations < 30. Probability distributions were compared on the basis of goodness to fit using the Anderson-Darling tests. The use of the two- parameter Weibull distribution for strength data of quasi-brittle sintered steels is questioned, because there is sufficient evidence that the 3-parameter distribution fits the data better.
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