Ceramic materials generally lack ductility and toughness, and exhibit variability in properties. In order to design with ceramic materials, the variation in material properties, especially strength, has to be statistically analyzed for reliability. Conventional design can be done with calculations utilizing safety factors. However, modern design aspects include proof testing and appropriate nondestructive evaluation methodology. Possible microstructural changes which occur during proof testing may influence subsequent material behavior and must be included in the design methodology. The temperature dependence of flexural strength of two engineering structural ceramics—single-phase sintered alpha silicon carbide and two-phase fine grain reaction-bonded silicon carbide—are examined. Using Weibull statistics, the risk of rupture for various stress levels has been derived from flexural versus tensile strength relationships. Ceramic life prediction considers subcritical crack growth and strength degradation in service environments. The slow crack growth possibilities at elevated temperatures for sintered alpha silicon carbide are examined in dynamic stressing rate and stress rupture experiments. Crack arrest and crack propagation resistance during proof testing and their implications in the probabilistic design with ceramics are analyzed.
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July 1982
Research Papers
Probabilistic Design and Reliability of Silicon Carbide Ceramics
M. Srinivasan,
M. Srinivasan
The Carborundum Company, Niagara Falls, N. Y. 14302
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S. G. Seshadri
S. G. Seshadri
The Carborundum Company, Niagara Falls, N. Y. 14302
Search for other works by this author on:
M. Srinivasan
The Carborundum Company, Niagara Falls, N. Y. 14302
S. G. Seshadri
The Carborundum Company, Niagara Falls, N. Y. 14302
J. Mech. Des. Jul 1982, 104(3): 635-642 (8 pages)
Published Online: July 1, 1982
Article history
Received:
January 6, 1982
Online:
November 17, 2009
Citation
Srinivasan, M., and Seshadri, S. G. (July 1, 1982). "Probabilistic Design and Reliability of Silicon Carbide Ceramics." ASME. J. Mech. Des. July 1982; 104(3): 635–642. https://doi.org/10.1115/1.3256398
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