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Creep of a Silicon Nitride Under Various Specimen/Loading ConfigurationsExtensive creep testing of a hot-pressed silicon nitride (NC132) was performed at 1300 C in air using five different specimen/loading configurations, including pure tension, pure compression, four-point uniaxial flexure, ball-on-ring biaxial flexure, and ring-on-ring biaxial flexure. Nominal creep strain and its rate for a given nominal applied stress were greatest in tension, least in compression, and intermediate in uniaxial and biaxial flexure. Except for the case of compressive loading, nominal creep strain generally decreased with time, resulting in less-defined steady-state condition. Of the four different creep formulations - power-law, hyperbolic sine, step, redistribution models - the conventional power-law model still provides the most convenient and reasonable means to estimate simple, quantitative creep parameters of the material. Predictions of creep deformation for the case of multiaxial stress state (biaxial flexure) were made based on pure tension and compression creep data by using the design code CARES/Creep.
Document ID
20010061366
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Choi, Sung R.
(NASA Glenn Research Center Cleveland, OH United States)
Powers, Lynn M.
(NASA Glenn Research Center Cleveland, OH United States)
Holland, Frederic A.
(NASA Glenn Research Center Cleveland, OH United States)
Gyekenyesi, John P.
(NASA Glenn Research Center Cleveland, OH United States)
Holland, F. A.
Date Acquired
September 7, 2013
Publication Date
January 1, 2000
Subject Category
Nonmetallic Materials
Meeting Information
Meeting: 7th International Symposium on Ceramic Materials and Components for Engines
Location: Goslar
Country: Germany
Start Date: June 18, 2000
End Date: June 22, 2000
Sponsors: Deutsche Keramische Gesellschaft
Funding Number(s)
PROJECT: RTOP 910-30-11
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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