Rotational flexural strength of cylindrical brittle specimens

Conventional static flexural strength testing of brittle cylindrical rods only subjects a small fraction of the entire specimen's area or volume to the maximum tensile stress. Thus, a nonconservative measured strength likely results since most flaws on the surface or in the bulk are not subject...

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Bibliographic Details
Published inJournal of the American Ceramic Society Vol. 105; no. 7; pp. 4897 - 4909
Main Authors Wereszczak, Andrew A., Steiner, Emily F., Jadaan, Osama M., Wiles, Randy H., Kuwik, Brett S.
Format Journal Article
LanguageEnglish
Published Columbus Wiley Subscription Services, Inc 01.07.2022
American Ceramic Society
Subjects
brittle materials
Brittleness
effective area
effective volume
Flexing
Flexural strength
flexure
MATERIALS SCIENCE
Modulus of rupture in bending
Rods
Rotation
strength
Strength testing
Tensile stress
Tubes
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Summary:Conventional static flexural strength testing of brittle cylindrical rods only subjects a small fraction of the entire specimen's area or volume to the maximum tensile stress. Thus, a nonconservative measured strength likely results since most flaws on the surface or in the bulk are not subjected to a sufficiently high tensile stress that can cause fracture. To mitigate this, a rotational flexural tester and corresponding test method were developed whereby rotation and monotonically increasing three‐point flexure were superimposed to investigate fracture response of solid glass cylinders. This combination of rotation and flexure subjects more area and volume of a cylindrical test specimen to tensile stress than a standard static (nonrotating) flexural test. As anticipated, failure stresses were lower for the rotational flexural test. Expressions for effective area and volume are provided for rotating solid rods and tubes subjected to three‐point, four‐point, uniform, and uniformly distributed load bending configurations.
Bibliography:This manuscript has been authored by UT‐Battelle, LLC under contract number: DE‐AC05‐00OR22725 with the US Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid‐up, irrevocable, world‐wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan
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http://energy.gov/downloads/doe‐public‐access‐plan
ObjectType-Article-1
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USDOE Office of Nuclear Energy (NE)
AC05-00OR22725
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.18452