Size Effects in Ceramic Materials: Computational Issues Associated With Parameter Estimations

Report No. ARL-CR-0560
Authors: Stephen F. Duffy and Eric H. Baker
Date/Pages: April 2005; 35 pages
Abstract: Two test specimen geometries obtained from circumferentially machined, tubular components have been proposed to investigate different flaw populations that might be present in a ceramic gun barrel. C-ring specimens tested in compression will generate maximum tensile stress states at the outer surface of the barrel. This stress state will activate critical flaws that are oriented parallel to the long axis of the tube. The sectored flexure bar specimen tested in four-point flexure will activate flaws aligned circumferentially around the tube. There is a need to take failure data from these tests and transform the information so that material characteristic strengths can be computed for subsequent Weibull analyses conducted on the gun barrel component. In order to compute the material characteristic strengths, the requisite Weibull effective area and/or effective volume parameters must be obtained. The procedure for numerically computing the Weibull effective area and effective volume for C-ring and sectored flexural test specimens is detailed in this article.
Distribution: Approved for public release
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Last Update / Reviewed: April 1, 2005