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Статті в журналах з теми "Fatigue à grand nombre de cycle":
Robert, Camille, Nicolas Saintier, Thierry Palin-Luc, and Franck Morel. "Étude numérique du comportement en fatigue à grand nombre de cycles d’agrégats polycristallins de cuivre." Mécanique & Industries 12, no. 3 (2011): 209–14. http://dx.doi.org/10.1051/meca/2011109.
Poncelet, M., G. Barbier, B. Raka, L. Vincent, and R. Desmorat. "Étude de l’endommagement d’un acier inoxydable austénitique par fatigue multiaxiale à grand nombre de cycles." Revue de Métallurgie 107, no. 2-3 (February 2010): 51–57. http://dx.doi.org/10.1051/metal/2010006.
Bouchard, P. O., M. Milesi, and Y. Chastel. "Approche multi-échelles pour l’étude de l’anisotropie induite par le forgeage en fatigue à grand nombre de cycles." Revue de Métallurgie 107, no. 9 (October 2010): 353–61. http://dx.doi.org/10.1051/metal/2010114.
Vivensang, M., and A. Gannier. "Interprétation microstructurale du comportement de deux types d’acier 35CD4 en cumul de dommage en fatigue à grand nombre de cycles." Revue de Métallurgie 91, no. 12 (December 1994): 1787–96. http://dx.doi.org/10.1051/metal/199491121787.
Gornet, Laurent, Ophélie Westphal, Modesto Mateos, Alina Krasnobrizha, Patrick Roszycki, Catherine Peyrac, and Fabien Lefebvre. "Propriétés mécaniques en fatigue à grands nombres de cycles des composites carbone époxy." Revue des composites et des matériaux avancés 25, no. 2 (June 30, 2015): 181–200. http://dx.doi.org/10.3166/rcma.25.181-200.
Danho, Mathias, and Éric Haubruge. "Comportement de ponte et stratégie reproductive de Sitophilus zeamais [Coleoptera : Curculionidae]." Biologie et comportement 84, no. 2 (March 11, 2004): 59–67. http://dx.doi.org/10.7202/007808ar.
Gee, Ellen M. "The Transition to Grandmotherhood: A Quantitative Study." Canadian Journal on Aging / La Revue canadienne du vieillissement 10, no. 3 (1991): 254–70. http://dx.doi.org/10.1017/s0714980800005328.
López, Paula, Erika Girardi, and Sébastien Pfeffer. "Importance des microARN cellulaires dans la régulation des infections virales." médecine/sciences 35, no. 8-9 (August 2019): 667–73. http://dx.doi.org/10.1051/medsci/2019130.
Perrenoud, Philippe. "De la gestion de classe à l’organisation du travail dans un cycle d’apprentissage." Articles 25, no. 3 (October 17, 2007): 533–70. http://dx.doi.org/10.7202/032013ar.
Meindl, Dieter. "Modernism and the English Canadian Short Story Cycle." Recherches anglaises et nord-américaines 20, no. 1 (1987): 17–22. http://dx.doi.org/10.3406/ranam.1987.1161.
Дисертації з теми "Fatigue à grand nombre de cycle":
Blanche, Antoine. "Effets dissipatifs en fatigue à grand et très grand nombre de cycles." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2012. http://tel.archives-ouvertes.fr/tel-00784772.
Marti, Nicolas. "Effets de la fréquence et de la température sur les mécanismes de microplasticité en fatigue à grand et très grand nombre de cycles." Thesis, Paris, ENSAM, 2014. http://www.theses.fr/2014ENAM0041/document.
Nowadays there is a growing demand for the development of fast and robust fatigue life prediction methods in the very high cycle fatigue domain. In this way, ultrasonic fatigue technique which appeared in 1950 is very interesting for manufacturers. Because the typical frequency of these tests is 20 kHz, this technique is efficient to perform tests up to a very high number of cycles in a reasonable time (109 cycles are reached in 14 h). However, the frequency domain of these fatigue tests facilities raises the issue of the effect of frequency and more generally the validity of the obtained results for estimating fatigue life of structures loaded at frequencies three or four order of magnitude below ultrasonic frequencies. The objective of this work is to evaluate the effect of the loading frequency on the precursors of fatigue damage, namely the microplasticity at the grain scale. This thesis work deals with the case of polycrystalline pure copper loaded in fully reversed tensioncompression. To show the effect of frequency, the Wöhler or S-N curves were constructed at different frequencies. Then, the study focused on the mechanisms of microplasticity preceding crack initiation and several criteria were investigated: the morphologies of the slip bands and their locations in the microstructure, the thresholds of appearance of the slip bands, the evolution of the slip bands amount with the number of cycles, the distribution of the microplasticity in the grains, the dissipated energy during a fatigue cycle. Cross slip and vacancies production and diffusion are two mechanisms which play a part in the formation of slip bands and extrusions in surface. Their respective roles on the effects of frequency observed are discussed
Simon, Julien. "Influence de micro-entailles sur le comportement en fatigue à grand nombre de cycles d'un alliage de TA6V : Comparaison avec le fretting-fatigue." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2017. http://www.theses.fr/2017ESMA0034/document.
This study is about the influence of micro-notches on the high cycle fatigue behavior of a Ti64 alloy and the comparison with similar fretting fatigue tests. Preliminary studies showed that fretting-fatigue stress fields can be reproduced by micro-notched. The COGNAC project leaded by Safran Aircraft Engines was built to verify if a unique model can reproduce both fretting-fatigue and notched samples fatigue tests. The scope of this experimental study is limited to the notched samples. In this PHD thesis, the notches are grinded and the results are compared with fretting-fatigue tests on grinded surfaces. V-notched with notch root radius from 50 to 500 μm were chosen to reproduce the stress gradient of fretting-fatigue tests. A geometry with two inclined notches facing each other allows to reproduce shear stress and stress triaxiality from fretting-fatigue tests. Three different experimental studies were performed. First on un-notched specimens with a grinded surface state to produce a reference fatigue limit for grinded surface state without stress concentration. The second study the notch root radius effect on the fatigue limit with samples with one non-inclined notch of 500 μm of depth. The last one is a series of fatigue tests on samples with two inclined notches that reproduce the stress distribution of fretting-fatigue tests. Pseudo-cleavage facets, multi cracks initiations in the notch root and the presence of two propagation stages is similar to the fretting-fatigue tests mechanisms. However, non propagating cracks were not observe at the notch root while many of them were present during the fretting-fatigue test. The initiation sites and the early stages of propagation seem to be controlled by grinded affected areas. Finally, three fatigue criteria were used to try to reproduce the experimental results. The criteria based on the critical distance theory and gradient theory –with a local gradient and an affine effect of the gradient term- can reproduce the fatigue limits of notched samples but fail to predict both notched and un-notched specimen fatigue limits with a unique data set. The third one is a probabilistic criterion which success to predict the experimental fatigue limits not only of notched samples but also smooth ones. The comparisons between the experimental results of the fatigue on the specimens with two inclined notches and the fretting-fatigue shows a difference of 20%. The distribution of the Crossland stress is quite similar. In the future, it would be useful to make a new comparison between fretting-fatigue and fatigue on notches using the probabilistic criterion to design the tests. This new comparison could lead to the proposal of a unique methodology to take into account the fretting-fatigue and the fatigue on stress concentrators
Bracquart, Benoît. "Etude des interactions défaut géométrique / microstructure dans les mécanismes d’endommagement en fatigue à grand nombre de cycles d’alliages métalliques." Thesis, Angers, 2018. http://www.theses.fr/2018ANGE0009.
The aim of this study is to analyze the influence of microstructure and geometrical surface defects on the high cycle fatigue (HCF) behavior of acommercial purity polycrystalline aluminium. This work relies on an experimental test programme and numerical Finite Element (FE) simulations, in order to better understand microstructural parameters governing crack initiation at defects. To this end, both caracteristic dimensions (grains and defect) are varied. Thermomechanical treatments are set up to control the grain size, and obtained microstructures are caracterized monotonically and cyclically. Then, uniaxial fully reversed tension-compression HCF tests are carried out on specimens with defects, either with an in-situ surface crack monitoring, or a study of the crack initiation at the defect root after cycling. Results are then analyzed in order to determine the influence of different characteristic lengths, as well as crystalline orientation, via EBSD maps. Numerical FE simulations are then carried out to detetermine precisely local mechanical fields. To this end, polycrystalline aggregates 3D meshes representative of experimental configurations are set up. A crystal plasticity constitutive model with gradient is used in order to reproduce the plastic slip at the glide system scale, and the grain size effect. The distribution of afatigue indicator parameter in the different configurations is studied, in order to complement experimental results
Doudard, Cédric. "Détermination rapide des propriétés en fatigue à grand nombre de cycles à partir d'essais d'échauffement." Cachan, Ecole normale supérieure, 2004. http://www.theses.fr/2004DENS0036.
Echerradi, Insaf. "Modèle rapide de plasticité cristalline dans les polycristaux pour la fatigue à grand nombre de cycles." Electronic Thesis or Diss., Marne-la-vallée, ENPC, 2023. http://www.theses.fr/2023ENPC0038.
This thesis concerns the study of the reliability of structures working in fatigue. One of the most important subjects is the understanding and modelling of fatigue phenomena in both normal and accidental situations. In polycrystals, these phenomena are of a probabilistic nature: for the same cyclic loading, two macroscopically identical specimens have different lifetimes. This is because the microstructures exhibit a certain variability. The traditional approach is to establish S-N curves experimentally. Due to the random nature of the fatigue phenomena, this experimental procedure must be repeated a large number of times to be statistically representative. It is generally considered that the safe prediction of service life for a given loading level is the average number of cycles to failure minus twice the standard deviation. This approach is extremely cumbersome in terms of experimental effort, but also inadequate from the point of view of risk analysis.The main objective of this work is to develop a polycrystalline evolution model integrating plasticity and fracture, sufficiently fast in calculation time to allow probabilistic analysis and applicable on the scale of an entire structure. The proposed model is based on the principle of minimising incremental energy and targets low-amplitude loading, for which plasticity is confined to a few critical grains that are assumed to be distant from one another and loaded according to a single sliding system. Initially, we assume isotropic and linear kinematic strain hardening, neglecting elastic interactions between critical grains. The plastic slip increment in each critical grain is then obtained as an explicit function of the material parameters, the loading, and a localization tensor determined entirely by the grain geometry and its elastic moduli. For ellipsoidal grains, this location tensor is identified with the Eshelby tensor. The validity of the model is studied by comparison with finite element calculations. The model is then extended to take into account the dominant effects of elastic interaction between grains. Based on an analysis of dislocations, a non-linear strain-hardening law is also proposed, showing the effect of grain size. An extension of the polycrystalline model to this type of law is presented.For cyclic loading, the proposed approach makes it possible to calculate the incremental evolution of a polycrystal using analytical recurrence formulae, without requiring any spatial discretisation. In the simplest situation, where elastic interactions are neglected, direct formulae are obtained giving the stabilized state reached after a large number of cycles. This polycrystalline model is used to analyse the sensitivity of fatigue life to microstructural parameters such as grain size, morphological and crystallographic textures. The influence of the stress gradient is also discussed. Finally, the applicability of the model to real structures is illustrated by the study of stents, small biomedical devices that are subjected to cyclic loading due to heartbeats and for which fatigue life is crucial
Qilafku, Genti. "Effet d'entaille à la fatigue en grand nombre de cycles : rôle du gradient de contrainte." Metz, 2000. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/2000/Qilafku.Genti.SMZ0010.pdf.
QILAFKU, GENTI Pluvinage Guy. "EFFET D'ENTAILLE A LA FATIGUE EN GRAND NOMBRE DE CYCLES. ROLE DU GRADIENT DE CONTRAINTE /." [S.l.] : [s.n.], 2000. ftp://ftp.scd.univ-metz.fr/pub/Theses/2000/Qilafku.Genti.SMZ0010.pdf.
Guerchais, Raphaël. "Influence d'accidents géométriques et du mode de chargement sur le comportement en fatigue à grand nombre de cycles d'un acier inoxydable austénitique 316L." Thesis, Paris, ENSAM, 2014. http://www.theses.fr/2014ENAM0020/document.
The aim of this study is to analyze the influence of both the microstructure and defects on the high cycle fatigue (HCF) behaviour of a 316L austenitic stainless steel thanks to finite element (FE) simulations of polycrystalline aggregates.%The scatter encountered in the HCF behavior of metallic materials is often explained by the anisotropic elasto-plastic behavior of individual grains leading to a highly heterogeneous distribution of plastic slip.Since fatigue crack initiation is a local phenomenon, intimately related to the plastic activity at the crystal scale, it seems relevant to rely on this kind of modeling to evaluate the mechanical quantities.A preliminary numerical study, based on experimental data drawn from the litterature, was conducted on an electrolytic copper using simulations of 2D polycrystalline aggregates. The effect of the loading path and small artificial defects on the mesoscopic mechanical responses have been analyzed separately. Moreover, the predictive capabilities of some fatigue criteria, relying on the mesoscopic mechanical responses, has been evaluated. It was shown that the macroscopic fatigue limits predicted by a probabilistic fatigue criterion are in accordance with the experimental trends observed in multiaxial fatigue or in the presence of small defects.An experimental campaign is undertaken on an austenitic steel 316L. Low cycle fatigue tests are conducted in order to characterize the elasto-plastic behavior of the material. Load-controled HCF tests, using both smooth specimens and specimens containing an artificial hemispherical surface defect, are carried out to estimate the fatigue limits under various loading conditions (tension, torsion, combined tension and torsion, biaxial tension) and several defect radii. To complete the characterization of the material, the microstructure is studied thanks to EBSD analyzes and the cristallographic texture is measured by X-ray diffraction. These experimental data are used to reproduce, with FE simulations, the HCF tests on 2D and 3D microstructures representative of the austenitic steel. The heterogeneity of the mesoscopic mechanical quantities relevant in fatigue are discussed in relation to the modeling. The results from the FE models are then used along with the probabilistic mesomechanics approach to quantify the defect size effect for several loading paths. The relevance, with respect to the experimental observations, of the predicted fatigue strength distributions is assessed
Cervellon, Alice. "Propriétés en fatigue à grand et très grand nombre de cycles et à haute température des superalliages base nickel monogranulaires." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2018. http://www.theses.fr/2018ESMA0009/document.
High and very high cycle fatigue properties of Ni-based single crystal superalloys have been studied at 1000°C using three frequencies (0.5, 70, 20000 Hz), four stress ratios (-1, 0.05, 0.3, 0.8) and CMSX-4 alloy as reference.Firstly, the very high cycle fatigue regime (VHCF) has been studied at 20 kHz. At R = -1, fatal crack always initiates between 106 and 109 cycles from an internal casting pore et then propagates in a crystallographic mode, despite the presence of other metallurgical defects such as eutectics and carbides. The elaboration process controls VHCF life under these conditions as it directly affects casting pore size, whereas microstructure has no relevant influence. At R = 0.8, creep controls VHCF life and makes this regime sensitive to microstructure and alloy’s chemical composition. Long term tests (> 109 cycles) have also been characterized and have enabled to propose a crack initiation mechanism operating in the VHCF regime.Secondly, the influence of frequency on time-dependent damages such as oxidation and creep, and their interaction, has been studied. At R ≤ 0, reducing frequency inhibits the harmfulness of internal critical defects by promoting oxidation surface damage. At R ≥ 0.8, creep damage leads to specimens rupture for all frequency test and loading conditions. Intermediate stress ratios present an important interaction between oxidation, fatigue and creep damage according to the frequency and loading conditions. Based on these observations, a damage model that predicts CMSX-4 fatigue life has been proposed and presents satisfying results in comparison to experimental data
Звіти організацій з теми "Fatigue à grand nombre de cycle":
Belzil, Christian, Jorgen Hansen, and Julie Pernaudet. Les déterminants cognitifs et non-cognitifs du choix de filière et leur impact sur la phase initiale du cycle professionnel. CIRANO, May 2024. http://dx.doi.org/10.54932/zmct9599.