Life-time reliability based assessment of structures submitted to thermal fatigue

Type Article
Date 2007-07
Language English
Author(s) Guede Zakoua1, Suldret B2, Lemaire M3
Affiliation(s) 1 : IFREMER, Ctr Brest, F-29280 Plouzane, France.
2 : EDF R&D, F-77818 Moret Sur Loing, France.
3 : LaMI, Inst Francais Mecan Avancee, F-63175 Aubiere, France.
Source International Journal of Fatigue (0142-1123) (Elsevier), 2007-07 , Vol. 29 , N. 7 , P. 1359-1373
DOI 10.1016/j.ijfatigue.2006.10.021
WOS© Times Cited 11
Keyword(s) Spectral methods, Structural reliability, Thermal fatigue, Life time
Abstract A probabilistic approach of the current thermal fatigue design of nuclear components is set up. It aims at incorporating all kinds of uncertainties that affect the thermal fatigue behaviour. This approach is based on the theory of structural reliability. Two dual approaches of reliability analysis for the thermal fatigue are defined, respectively, in the time domain and in the frequency domain. Beside the probability of failure calculation, the sensitivity of the reliability index to each random variable is estimated. The proposed method is applied to a pipe submitted to thermal loading due to water flow. Both high cycles fatigue (HCF) and low cycles fatigue (LCF) regimes are investigated. The results show that it is possible to perform a complete reliability analysis to compute the failure probability. It is observed that the scatter of fatigue data and the heat transfer coefficient are the most important variables in thermal fatigue reliability. (C) 2006 Elsevier Ltd. All rights reserved.
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