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

Jadaan, Osama M.¹  Wereszczak, Andrew A² 

[1] University of Wisconsin, Platteville;ORNL

关键词: AMBIENT TEMPERATURE;    CERAMICS;    ELASTICITY;    FORECASTING;    GEOMETRY;    PROBABILITY;    ULTIMATE STRENGTH;    MEASURING METHODS;    WIDTH;    THICKNESS;   

DOI  :  10.2172/950808
RP-ID  :  ORNL/TM-2009/090
PID  :  OSTI ID: 950808
Others  :  Other: VT0504000
Others  :  CEVT013
Others  :  TRN: US200911%%256

学科分类：材料科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

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.