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Статті в журналах з теми "Suivi de l’endommagement"
Charkaluk, Eric, and André Galtier. "Mesures et suivi de l’endommagement en fatigue." Revue de Métallurgie 107, no. 1 (January 2010): 1. http://dx.doi.org/10.1051/metal/2010011.
Повний текст джерелаStolarz, Jacques, and Thierry Magnin. "Suivi électrochimique de l’endommagement de matériaux métalliques en fatigue." Matériaux & Techniques 86, no. 7-8 (1998): 3–8. http://dx.doi.org/10.1051/mattech/199886070003.
Повний текст джерелаChocinski-Arnault, L., F. Touchard, and M. P. Buron. "Recyclage de pare-chocs automobiles : caractérisations microstructurale et mécanique avec suivi de l’endommagement." Matériaux & Techniques 100, no. 5 (2012): 425–35. http://dx.doi.org/10.1051/mattech/2012006.
Повний текст джерелаRevest, N., J. Renard, A. Thionnet, L. Boulay, and P. Castaing. "Suivi de l’endommagement dans les structures en composites par une analyse optique in-situ." Revue de Métallurgie 107, no. 1 (January 2010): 15–20. http://dx.doi.org/10.1051/metal/2010007.
Повний текст джерелаHenry, J., Z. Aboura, K. Khellil, and S. Otin. "Suivi de l’endommagement en fatigue d’un composite à renfort interlock carbone/époxy par émission acoustique." Matériaux & Techniques 100, no. 6-7 (2012): 643–52. http://dx.doi.org/10.1051/mattech/2012035.
Повний текст джерелаДисертації з теми "Suivi de l’endommagement"
Braisaz-Latille, Paul. "Suivi et prédiction de l’initiation de l’endommagement et de la durée de vie en fatigue dans un matériau composite tissé présentant un défaut artificiel de fabrication par le biais d’une approche hybride." Mémoire, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/11901.
Повний текст джерелаWang, Yanjun. "Fatigue Thermique à grand nombre de cycles d’un acier inoxydable austénitique : apport des mesures de champs pour l’identification du chargement et le suivi in-situ de l’endommagement." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN037/document.
Повний текст джерелаThis PhD work is devoted to the study of thermal fatigue damage of AISI 316L(N) austenitic stainless steel, a candidate material to make the primary cooling system of Sodium-cooled Fast Reators (SFRs). Initiation and propagation of crack networks can be induced by locally constrained thermal expansions or contractions of the component surface subjected to repeated thermal shocks of turbulent coolants.A campaign of high cycle thermal fatigue tests on AISI 316L(N) austenitic stainless steel has been carried out with the FLASH facility. Full field measurements have been performed to capture thermomechanical fields of monitored surfaces in thermal fatigue tests. An original procedure based on hybrid multiview correlation (HMC) uses images acquired by two visible light cameras and one infrared camera. With such a system, Lagrangian temperature fields can be measured and experimental strain or displacement fields can be used to calibrate Finite Element analyses to reproduce the thermomechanical cyclic response of the material in the region of interest. One additional benefit of the spatiotemporal synchronization of the HMC system is that the entire fatigued region has been monitored in-situ during the whole test, without interruptions, which enables crack initiation and propagation to be tracked thanks to the different modalities of the three cameras
Vié, Théophile. "On the effect of coatings and pre-corrosion on the fatigue behaviour of 7075-T6 aluminium alloy samples monitored with Acoustic Emission (AE) : Towards lifetime estimation." Electronic Thesis or Diss., Lyon, INSA, 2023. http://www.theses.fr/2023ISAL0092.
Повний текст джерелаThe aim of this thesis work is to identify and quantify the impact of different coatings and corrosive environments on the fatigue behaviour of 7075-T6 aluminium alloy parts by monitoring damage using acoustic emission. Monotonic tensile and cyclic tensile/tensile fatigue tests Rσ=0.1 in the limited endurance range were carried out on specimens coated with several types of coating and subjected to different types of corrosion processes. The coatings studied are composed of combinations of three distinct protective layers: An aluminium oxide conversion layer obtained by a sulphuric anodisation process and two polymeric layers of epoxy paints, a primer and a topcoat. Various pre-corrosion scenarios were set up in order to study the impact of ageing induced by an aggressive environment on the different coating layers, as well as substrate corrosion on the damage mechanisms of our materials. The combined effect of corrosion of the substrate and ageing of the coatings is studied by means of galvano static coupling of a specimen immersed in a corrosive NaCl solution (pH 4, 30 g/L) with a local defect in the coatings. The effect of a corrosion defect alone was studied by the local application of an acidic HCl solution (pH 0.1) to a defect in the coating. Finally, the effect of ageing alone was obtained by immersing test specimens with no apparent coating defects in a NaCl solution (30 g/L). The damage mechanisms and dynamics of our materials are studied via an overall study of the AE response during mechanical testing. Analysis of the AE results enabled us to identify different acoustic signatures relating to specific damage mechanisms. These were determined by microstructural analysis based on optical microscope and SEM observations. For all the types of materials tested (different coatings and pre-corrosion protocols), damage indicators based on the AE data are studied with the aim of determining characteristic damage times that provide information on the remaining useful life before specimen failure (Remaining Useful Lifetime, RUL). The characteristic times defined are linked to the initiation of cracks in the aluminium substrate and to the propagation of the main fatigue crack. The various sources of AE and the characteristic damage times can be used as a basis for implementing the model in order to estimate the time to failure of our materials under cyclic loading
Hébrard, Louis. "Study on the effect of the environment on internal fatigue crack propagation in Ti-6Al-4V." Electronic Thesis or Diss., Lyon, INSA, 2023. http://www.theses.fr/2023ISAL0120.
Повний текст джерелаIn the Very High Cycle Fatigue regime (fatigue lives longer than 1e7 cycles), fatigue cracks tend to initiate internally. This makes visual detection impossible during maintenance operations. Consequently, engineers need robust fatigue datasets to prevent such internal crack initiations that may lead to the fracture of a critical part. To obtain such data, in-situ experimental techniques are developed. In particular, micro-computed tomography allows to acquire direct images of internal fatigue cracks. In this study, a combination of in-situ micro-tomography and ultrasonic fatigue cycling has been applied to specimens that contain an internal sharp notch to study the propagation of internal fatigue cracks. More precisely, the crack shape of internal fatigue cracks has been monitored in 3D at different instants of their propagation up to the Very High Cycle Fatigue regime. Some internal notches have been linked to the specimen surface given access to the ambient atmosphere. This was done to study the influence of the environment on internal fatigue cracks. This experimental procedure allowed to acquire for the first time, in-situ observations of internal fatigue cracks propagating with and without air in a Ti64 alloy. Temperature measurements were also carried out to evaluate the effect of the environment on the plasticity at the crack tip. Finally, the fatigue data obtained at ultrasonic frequencies allowed to evaluate the influence of the cycling frequency on the crack growth rates