A ceramic gas seal for a utility gas turbine was designed and analyzed using ANSYS and CARES/LIFE. SN-88 silicon nitride was selected as the candidate material. The objective was to validate the failure prediction methodology using rectangular plates, which were thermally shocked in a fluidized bed. The failure prediction methodology would then be applied to the representative component geometry. Refined ANSYS finite element modeling of both the plate and component geometries was undertaken. The CARES/LIFE reliability analysis of the component geometry for fast fracture was performed for two cases: (I) steady-state thermomechanical loads during normal gas turbine operation and (II) transient thermal shock loading during a turbine trip. Thermal shock testing of alumina disks was performed in order to gain confidence in the testing and analysis procedures. Both notched and unnotched SN88 plates were then tested. Failure modes were identified through flexure tests and data censoring was performed using SAS. Weibull modulus was assumed to be invariant with temperature and the scale parameter was assumed to vary through a scaling variable such that multiple data could be pooled.
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April 1996
Research Papers
Thermal Shock Analysis and Testing of Simulated Ceramic Components for Gas Turbine Applications
H. Rajiyah,
H. Rajiyah
Mechanics of Materials Program, GE Corporate Research and Development, Schenectady, NY 12301
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L. P. Inzinna,
L. P. Inzinna
Mechanics of Materials Program, GE Corporate Research and Development, Schenectady, NY 12301
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G. G. Trantina,
G. G. Trantina
Mechanics of Materials Program, GE Corporate Research and Development, Schenectady, NY 12301
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R. M. Orenstein,
R. M. Orenstein
Power Generation Engineering, GE Power Generation, Schenectady, NY 12301
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M. B. Cutrone
M. B. Cutrone
Power Generation Engineering, GE Power Generation, Schenectady, NY 12301
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H. Rajiyah
Mechanics of Materials Program, GE Corporate Research and Development, Schenectady, NY 12301
L. P. Inzinna
Mechanics of Materials Program, GE Corporate Research and Development, Schenectady, NY 12301
G. G. Trantina
Mechanics of Materials Program, GE Corporate Research and Development, Schenectady, NY 12301
R. M. Orenstein
Power Generation Engineering, GE Power Generation, Schenectady, NY 12301
M. B. Cutrone
Power Generation Engineering, GE Power Generation, Schenectady, NY 12301
J. Eng. Gas Turbines Power. Apr 1996, 118(2): 246-250 (5 pages)
Published Online: April 1, 1996
Article history
Received:
February 27, 1995
Online:
November 19, 2007
Citation
Rajiyah, H., Inzinna, L. P., Trantina, G. G., Orenstein, R. M., and Cutrone, M. B. (April 1, 1996). "Thermal Shock Analysis and Testing of Simulated Ceramic Components for Gas Turbine Applications." ASME. J. Eng. Gas Turbines Power. April 1996; 118(2): 246–250. https://doi.org/10.1115/1.2816584
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