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Accelerated Testing Methodology in Constant Stress-Rate Testing for Advanced Structural Ceramics: A Preloading TechniquePreloading technique was used as a means of an accelerated testing methodology in constant stress-rate ('dynamic fatigue') testing for two different brittle materials. The theory developed previously for fatigue strength as a function of preload was further verified through extensive constant stress-rate testing for glass-ceramic and CRT glass in room temperature distilled water. The preloading technique was also used in this study to identify the prevailing failure mechanisms at elevated temperatures, particularly at lower test rate in which a series of mechanisms would be associated simultaneously with material failure, resulting in significant strength increase or decrease. Two different advanced ceramics including SiC whisker-reinforced composite silicon nitride and 96 wt% alumina were used at elevated temperatures. It was found that the preloading technique can be used as an additional tool to pinpoint the dominant failure mechanism that is associated with such a phenomenon of considerable strength increase or decrease.
Document ID
20020034125
Acquisition Source
Glenn Research Center
Document Type
Reprint (Version printed in journal)
Authors
Choi, Sung R.
(NASA Glenn Research Center Cleveland, OH United States)
Gyekenyesi, John P.
(NASA Glenn Research Center Cleveland, OH United States)
Huebert, Dean
(Science and Applied Technology Woodland Hills, CA United States)
Bartlett, Allen
(Science and Applied Technology Woodland Hills, CA United States)
Choi, Han-Ho
(Samsung Corning Co. Suwon Korea, Republic of)
Date Acquired
August 20, 2013
Publication Date
January 1, 2001
Subject Category
Nonmetallic Materials
Report/Patent Number
ASME-2001-GT-460
Meeting Information
Meeting: International Gas Turbine and Aeroengine Congress and Exhibition
Location: New Orleans, LA
Country: United States
Start Date: June 4, 2001
End Date: June 7, 2001
Sponsors: American Society of Mechanical Engineers
Distribution Limits
Public
Copyright
Other

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