To enhance the assessment of reactor pressure vessel life under severe accident, a cooperative research program is conducted between CEA, EDF, and Framatome, parts of which are supported by the European Commission. Within the framework of this program, a model based on Lemaitre and Chaboche with predictive capability in the field of viscoplastic flow, material damage, and failure has been generalized and implemented in CASTEM 2000 finite element code. In order to validate the model in mechanical situations featuring the same basic characteristics as the severe accident scenarios, analytical experiments are conducted on the RUPTHER facility: a thin shell tube is loaded with an internal pressure and submitted to an axial thermal gradient with elevated temperatures. The specific question of the interest of the coupled damage approach in the failure prediction is addressed. Comparisons of the predictions relying on coupled and uncoupled damage-viscoplasticity models show that, at higher temperatures, failure could be predicted through uncoupled damage evaluation provided the main nonlinear effects like large displacements and updated pressure are taken into account, while at lower temperatures coupling between damage and deformation is necessary. Examples based on some RUPTHER creep test predictions are given.
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August 2001
Technical Papers
Comparison of the Predictions Relying on Coupled/Uncoupled Damage-Viscoplasticity Models for Creep Test Analyses
L. Nicolas,
L. Nicolas
Commissariat a` l’Energie Atomique, DEN/DM2S/SEMT, 91191 Gif sur Yvette Cedex, France
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P. Mongabure,
P. Mongabure
Commissariat a` l’Energie Atomique, DEN/DM2S/SEMT, 91191 Gif sur Yvette Cedex, France
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L. Le Ber,
L. Le Ber
Commissariat a` l’Energie Atomique, DEN/DM2S/SEMT, 91191 Gif sur Yvette Cedex, France
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J. Devos,
J. Devos
Commissariat a` l’Energie Atomique, DEN/DM2S/SEMT, 91191 Gif sur Yvette Cedex, France
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S. Bhandari,
S. Bhandari
Framatome, Tour Framatome, 92084 Paris La De´fense Cedex, France
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C. Messelier-Gouze
C. Messelier-Gouze
Electricite´ de France, DRD/MTC, Les Renardie`res, Ecuelles, 77818 Moret-sur-Loing Cedex, France
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L. Nicolas
Commissariat a` l’Energie Atomique, DEN/DM2S/SEMT, 91191 Gif sur Yvette Cedex, France
P. Mongabure
Commissariat a` l’Energie Atomique, DEN/DM2S/SEMT, 91191 Gif sur Yvette Cedex, France
L. Le Ber
Commissariat a` l’Energie Atomique, DEN/DM2S/SEMT, 91191 Gif sur Yvette Cedex, France
J. Devos
Commissariat a` l’Energie Atomique, DEN/DM2S/SEMT, 91191 Gif sur Yvette Cedex, France
S. Bhandari
Framatome, Tour Framatome, 92084 Paris La De´fense Cedex, France
C. Messelier-Gouze
Electricite´ de France, DRD/MTC, Les Renardie`res, Ecuelles, 77818 Moret-sur-Loing Cedex, France
Contributed by the Pressure Vessels and Piping Division and presented at the Pressure Vessels and Piping Conference, Seattle, Washington, July 23–27, 2000, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the PVP Division, October 27, 2000; revised manuscript received February 5, 2001. Editor: S. Y. Zamrik.
J. Pressure Vessel Technol. Aug 2001, 123(3): 298-304 (7 pages)
Published Online: February 5, 2001
Article history
Received:
October 27, 2000
Revised:
February 5, 2001
Citation
Nicolas , L., Mongabure , P., Le Ber , L., Devos, J., Bhandari, S., and Messelier-Gouze, C. (February 5, 2001). "Comparison of the Predictions Relying on Coupled/Uncoupled Damage-Viscoplasticity Models for Creep Test Analyses ." ASME. J. Pressure Vessel Technol. August 2001; 123(3): 298–304. https://doi.org/10.1115/1.1372326
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