One of the major challenges involved in the use of ceramic materials in advanced vehicular heat engines is ensuring adequate strength and durability. This Department of Energy supported activity has developed methodologies to predict the structural behavior of ceramic components. The effort involved the characterization of injection-molded and hot isostatic pressed PY6 silicon nitride and the development of analytical life prediction techniques. Three failure modes are addressed: fast fracture, slow crack growth, and creep rupture. The technique deals with surface as well as internal component failures. The life prediction methodologies for fast fracture and slow crack growth have been verified using two types of confirmatory specimens: (1) flat circular disks subjected to bending stresses, and (2) high-speed rotating spin disks. Correlation was achieved for a variety of test conditions and failure mechanisms. The predictions associated with surface failures proved to be optimistic, requiring re-evaluation of the components’ initial fast fracture strength. Correlation was achieved for the spin disks that failed in fast fracture from internal flaws. Time-dependent, elevated-temperature spin disk failures were also successfully predicted.
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October 1996
Research Papers
The Development of Life Prediction Techniques for Structural Ceramics
P. K. Khandelwal,
P. K. Khandelwal
Allison Engine Company, Indianapolis, IN 46206
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N. J. Provenzano,
N. J. Provenzano
Allison Engine Company, Indianapolis, IN 46206
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W. E. Schneider
W. E. Schneider
Allison Engine Company, Indianapolis, IN 46206
Search for other works by this author on:
P. K. Khandelwal
Allison Engine Company, Indianapolis, IN 46206
N. J. Provenzano
Allison Engine Company, Indianapolis, IN 46206
W. E. Schneider
Allison Engine Company, Indianapolis, IN 46206
J. Eng. Gas Turbines Power. Oct 1996, 118(4): 847-855 (9 pages)
Published Online: October 1, 1996
Article history
Received:
February 8, 1995
Online:
November 19, 2007
Citation
Khandelwal, P. K., Provenzano, N. J., and Schneider, W. E. (October 1, 1996). "The Development of Life Prediction Techniques for Structural Ceramics." ASME. J. Eng. Gas Turbines Power. October 1996; 118(4): 847–855. https://doi.org/10.1115/1.2817005
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