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11. Définition des chargements en fatigue

Author

SF2M, Commission Fatigue de la, primary, BIGNONNET, André, additional, CHIERAGATTI, Rémy, additional, COLIN, Bruno, additional, COURTIN, Stéphan, additional, HUTHER, Michel, additional, NGUYEN-TAJAN, Mac-Lan, additional, and SZMYTKA, Fabien, additional

Published
2016
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23. PWR Effect on Crack Initiation Under Equi-biaxial Loading: First tests with a particular fatigue device

Author

Dhahri, Hager, gourdin, Cédric, Perez, Gregory, COURTIN, Stéphan, Le, Roux, Jean, Christophe, MAITOURNAM, Habibou, and Association Française de Mécanique

Subjects
Austenitic stainless steel, PWR water environment, Equibiaxial loading, [PHYS.MECA]Physics [physics]/Mechanics [physics], Fatigue
Abstract

Colloque avec actes et comité de lecture. Internationale.; International audience; The lifetime extension of the nuclear power stations is considered as an energy challenge worldwide. That is why, the risk analysis and the study of various effects of different factors that could potentially represent a hazard to a safe long term operation are necessary. These structures, often of great dimensions, are subjected during their life to complex loading combining varying mechanical loads, multiaxial, with non-zero mean values associated with temperature fluctuations and also PWR environment. The methodology for fatigue dimensions of the Pressurized Water Reactor components (PWR) (ASME, RCC-M, KTA, ...) is based on the use of design curves established from test carried out in air at 20°C on smooth specimens by integrating safety coefficient that covers the dispersion of tests associated with the effects of structures. In the framework of fatigue design rules upgrading (RCC-M, RCC-MRx), the uniaxial reference fatigue curve was altered by taking into account effects like: Multiaxiality, Mean stress or strain, Surface roughness (polished or ground), Scale effect, Loading History. In addition to this effect, Environmentally Assisted Fatigue is also receiving nowadays an increased level of attention. In order to take into account the effects of these aggravating factors, two experimental device are developed at LISN with same specimen geometry: The first device (FABIME2) is to determinate the effect of equi-biaxiality and mean strain/ stress on the fatigue behavior of 316L and 304L-CLI austenitic stainless steel. A second and a new device (FABIME2E) based on FABIME2 is developed to study the impact of the environmental effect in the biaxial fatigue. The first results obtained with this new test stand FABIME2E of biaxial fatigue in the PWR environment will be presented. Their numerical interpretations using the engineering methods, provide answers to the different aggravating effects of fatigue in the components of nuclear reactors.

Published
2017

24. Simulation numérique d'un essai de soudage en rainure circulaire

Author

COURTIN, Stéphan, Le, Trang, Schroeder, Jeanne, Gilles, Philippe, Association Française de Mécanique, and Service irevues, irevues

Subjects
[PHYS.MECA]Physics [physics]/Mechanics [physics], [PHYS.MECA] Physics [physics]/Mechanics [physics]
Abstract

Colloque avec actes et comité de lecture. Internationale.; International audience; Cet article présente la simulation numérique d'un essai de soudage en rainure circulaire effectué sur une maquette instrumentée. Ce test est utilisé par AREVA pour la caractérisation de la fissuration à chaud des matériaux d'apport lors d'un soudage par procédé TIG. Les calculs 2D élastoplastiques ont été validés grâce aux relevés de températures et de retraits de soudage. Les contraintes et déformations en tout point de la structure, à tout moment de l'opération de remplissage de la rainure, sont ainsi accessibles par la simulation.

Published
2011

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