A new approach to tensile creep testing and analysis based on stress relaxation is described for sintered silicon nitride. Creep rate data covering up to five orders of magnitude were generated in tests lasting less than one day. Tests from various initial stresses at temperatures from 1250C to 1350C were analyzed and compared with creep rates measured during conventional constant load testing. It was shown that at least 40% of the creep strain accumulated under all test conditions was recoverable, and that the deformation could properly be described as viscoelastic/plastic. Tests were conducted to establish the level of repeatability and the effects of various thermomechanical histories. It was shown that none of the prior exposures led to significant impairment in creep strength. The results were used for three different grades to establish the value of the accelerated test to compare creep strengths for acceptance and for optimization. Several useful correlations were obtained between stress and creep rate. The systematic creep rate dependence as a function of loading strain prior to relaxation provided a possible basis for design in terms of a secant modulus analysis.
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ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition
June 7–10, 1999
Indianapolis, Indiana, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-7861-3
PROCEEDINGS PAPER
Stress Relaxation Testing as a Basis for Creep Analysis and Design of Silicon Nitride
David A. Woodford
,
David A. Woodford
Materials Performance analysis, Inc., Santa Barbara, CA
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Andrew A. Wereszczak
,
Andrew A. Wereszczak
Oak Ridge National Laboratory, Oak Ridge, TN
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Wate T. Bakker
Wate T. Bakker
Electric Power Research Institute, Palo Alto, CA
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David A. Woodford
Materials Performance analysis, Inc., Santa Barbara, CA
Andrew A. Wereszczak
Oak Ridge National Laboratory, Oak Ridge, TN
Wate T. Bakker
Electric Power Research Institute, Palo Alto, CA
Paper No:
99-GT-291, V004T02A008; 8 pages
Published Online:
December 16, 2014
Citation
Woodford, DA, Wereszczak, AA, & Bakker, WT. "Stress Relaxation Testing as a Basis for Creep Analysis and Design of Silicon Nitride." Proceedings of the ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General. Indianapolis, Indiana, USA. June 7–10, 1999. V004T02A008. ASME. https://doi.org/10.1115/99-GT-291
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