Revisiting the Recommended Geometry for the Diametrally Compressed Ceramic C-Ring Specimen

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A study conducted several years ago found that a stated allowable width/thickness (b/t) ratio in ASTM C1323 (Standard Test Method for Ultimate Strength of Advanced Ceramics with Diametrally Compressed C-Ring Specimens at Ambient Temperature) could ultimately cause the prediction of a non-conservative probability of survival when the measured C-ring strength was scaled to a different size. Because of that problem, this study sought to reevaluate the stress state and geometry of the C-ring specimen and suggest changes to ASTM C1323 that would resolve that issue. Elasticity, mechanics of materials, and finite element solutions were revisited with the C ring geometry. ... continued below

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Jadaan, Osama M. & Wereszczak, Andrew A April 1, 2009.

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A study conducted several years ago found that a stated allowable width/thickness (b/t) ratio in ASTM C1323 (Standard Test Method for Ultimate Strength of Advanced Ceramics with Diametrally Compressed C-Ring Specimens at Ambient Temperature) could ultimately cause the prediction of a non-conservative probability of survival when the measured C-ring strength was scaled to a different size. Because of that problem, this study sought to reevaluate the stress state and geometry of the C-ring specimen and suggest changes to ASTM C1323 that would resolve that issue. Elasticity, mechanics of materials, and finite element solutions were revisited with the C ring geometry. To avoid the introduction of more than 2% error, it was determined that the C ring width/thickness (b/t) ratio should range between 1-3 and that its inner radius/outer radius (ri/ro) ratio should range between 0.50-0.95. ASTM C1323 presently allows for b/t to be as large as 4 so that ratio should be reduced to 3.

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  • Report No.: ORNL/TM-2009/090
  • Grant Number: DE-AC05-00OR22725
  • DOI: 10.2172/950808 | External Link
  • Office of Scientific & Technical Information Report Number: 950808
  • Archival Resource Key: ark:/67531/metadc933418

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  • April 1, 2009

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 21, 2016, 6:49 p.m.

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Jadaan, Osama M. & Wereszczak, Andrew A. Revisiting the Recommended Geometry for the Diametrally Compressed Ceramic C-Ring Specimen, report, April 1, 2009; [Tennessee]. (digital.library.unt.edu/ark:/67531/metadc933418/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.