Добірка наукової літератури з теми "Matériaux hybrides – Contraintes (mécanique) – Endommagement, Mécanique de l' (milieux continus)"
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Дисертації з теми "Matériaux hybrides – Contraintes (mécanique) – Endommagement, Mécanique de l' (milieux continus)"
Miot, Stéphanie. "Rupture de structures composites stratifiées sous chargements statique et de fatigue." Aix-Marseille 1, 2009. http://www.theses.fr/2009AIX11016.
Повний текст джерелаRecent developments in the aeronautics industry have accelerated interest in the use of composites as primary structural materials. This project is based on a collaboration with Eurocopter. The objectives are to experimentally analyse and model the behaviour until failure of laminated composite structures under static and fatigue loadings. To describe the mechanical behaviour of composite materials, several damage mechanisms have to be considered. A model, based on the Continuum Damage Mechanics and recently developed at the LMA, takes into account the effects of transverse and shear damages characterized by the creation of small cracks which run along the fibres. This model was integrated into Abaqus/Standard in order to study the behaviour of laminated structures under static and fatigue loadings. The comparisons between experimental data and numerical simulations have proved that conventional failure criteria do not work if the strain field is inhomogeneous. A non local approach, based on the definition of a Fracture Characteristic Volume, has been developed. This method takes into account the effects of stress concentrations on the failure of laminated structures. Comparisons with experimental data allows to valid thebehaviour model associated to the non local approach for various materials, laminates and geometries in the case of static loading conditions. The application in the case of fatigue loading is in progress and first results are promising
Chihi, Manel. "Étude des performances d’un composite carbone/époxy dopé par des nanocharges sous des sollicitations sévères." Electronic Thesis or Diss., Brest, École nationale supérieure de techniques avancées Bretagne, 2021. http://www.theses.fr/2021ENTA0017.
Повний текст джерелаThis thesis work was carried out in a context of valorization of composite materials based on nanofillers. The knowledge of the mechanical behavior of nanocomposites doped by nanofillers submitted to high dynamic loading is an important data for the designers of composite structures dedicated to civil and military applications. This behavior must be characterized in a wide range of deformation; for strain rates in the range of 10² to 10⁵s⁻¹. Particular attention is devoted to the Hopkinson pressure bar system (SHPB) because of its frequent use in such a wide range of deformation which corresponds to the strain rate deformation range of most industrial applications. In this context, we first conducted a study focused on the effect of nanofillers on the dynamic behavior and damage kinetics of a carbon/epoxy composite. We have chosen two types of nanofillers with similar chemical compositions (based on pure carbon) but two different geometries (quasi-1D for carbon nanotubes (CNT) and 2D for graphene nanoplatelets (GNP). The two series of nanocomposites CNT and GNP were prepared under the same conditions while using common mass fractions (0.5%, 1% and 2%) in order to conduct a comparative study of the two nanocomposite systems. A dynamic compression test (in-plane (IP) and out-of-plane (OP)) and a numerical study were conducted. It has been shown that the dynamic behavior and damage kinetics of the materials are very sensitive to the strain rate and the direction of solicitation. The results of these tests also allowed us to understand the influence of the addition of nanofillers on the response of the materials. The percentage of 1% GNP shows optimal performances in stiffness, maximum stress and resistance to damage. However, nanocomposites can be very sensitive to environmental conditions, in particular to hygrothermal aging that can reduce the mechanical performances. Therefore, the effect of hygrothermal aging (60°C/80%RH) on the lifetime of nanocomposites is studied experimentally (in-plane loading). Decreases of different mechanical properties as a function of time (15, 40 and 100 days) and absorbed water content are highlighted for each mass fraction. However, it was shown that the introduction of nanofillers, except in the case of 0.5% CNT, leads to a more significant degradation of the reference composite
Millot, Thierry. "Etude d'un essai original de flexion-torsion 4 points et application à la modélisation du comportement des matériaux composites en contraintes complexes." Besançon, 1990. http://www.theses.fr/1990BESA2051.
Повний текст джерелаKarami, Mohammad Hassan. "Etude expérimentale du comportement poromécanique d'une roche endommageable." Lille 1, 1998. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1998/50376-1998-147.pdf.
Повний текст джерелаGérard, Nicolas. "Etude du comportement des fissures courtes au fond d'une entaille mécanique sous sollicitation en fatigue." Tours, 2003. http://www.theses.fr/2003TOUR4029.
Повний текст джерелаWeber, Bastien. "Fatigue multiaxiale des structures industrielles sous chargement quelconque." Lyon, INSA, 1999. http://theses.insa-lyon.fr/publication/1999ISAL0056/these.pdf.
Повний текст джерелаThe work of thesis deals with multiaxial fatigue. Its purpose is the fatigue life assessment of industrial structures submitted to any kind of solicitations, from the most basic case, which is uniaxial and periodical, to the most general one, which is multiaxial and of variable amplitude. The first part is dedicated to the study of multiaxial fatigue stress-based criteria. 37 criteria issued from the literature are analysed. They are divided into empirical, critical plane and global approaches. 24 criteria are validated through 233 multiaxial fatigue tests issued also from the literature. The second part aims at taking into account the stress gradient effect within the multiaxial criteria formulation. Similarly to some recent work, the stress gradient effect is introduced within the Laboratory's criteria. These propositions are validated through combined bending-torsion tests. A proposition is made to calculate the stress gradient field from finite elements results obtained over any complex industrial structure. The third part describes the evolution of the Laboratory's fatigue life prediction method under multiaxial random loading. The first step presents a plane per plane damage accumulation. The fatigue damage is calculated and cumulated on physical planes. The second step shows the influence of the so-called counting variable on the fatigue life prediction results, and leads to a new concept: the cycle counting and the damage assessment are performed plane per plane. This procedure avoids the dependence of the choice of the counting on the life assessments. A critical plane approach criterion is required for these latter methods. This work is integrated to an industrial software called Sollife allows one to simulate the fatigue behaviour of any complex structure. The first results are in good assessment with experiments. They show the important effect of metal forming process (as stamping) and result in lots of perspectives
Scida, Daniel. "Étude et modélisation du comportement mécanique de matériaux composites à renforts tisses hybrides et non hybrides." Compiègne, 1998. http://www.theses.fr/1998COMP1168.
Повний текст джерелаEl, Hage Christiane. "Modélisation du comportement élastique endommageable de matériaux composites à renfort tridimensionnel." Compiègne, 2006. http://www.theses.fr/2006COMP1642.
Повний текст джерелаThis thesis is dedicated to the modelling of the elastic damage behaviour composite material 3D reinforced. The study is articulated around three essential points: the comprehension of the damage process, analytical modelling and the optimization of architectures of the reinforcements. The studies of carbon architectures are resulting from an orthogonal weaving 3D and 5 Interlock. They are subjected respectively to compression and uniaxial tension tests. The correlation between signals of acoustic emission and the microscopic observations makes it possible to emphasize the effect of architecture on the phenomena of damages. The elastic damage behaviour until the rupture is described with a duality between an analytical model of homogenization and the criterion 3D of Tsai-Wu, coupled to damage criteria. This model takes into account the geometrical characteristic of architectures of the reinforcements. The optimization part is dedicated to minimization of the REV
Risbet-Voitot, Marion. "Influence de l'état métallurgique et d'un gradient de contraintes sur le critère d'endurance (critère de Dang Van) d'un superalliage à base nickel." Compiègne, 2002. http://www.theses.fr/2002COMP1436.
Повний текст джерелаVu, Anh Thang. "Endommagement de stratifiés aéronautiques à fibre de carbone et matrice polymère soumis à des chargements monotones ou cycliques à plusieurs températures : expériences et modélisation." Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aéronautique, 2009. http://www.theses.fr/2009ESMA0009.
Повний текст джерелаThe main objective of this study is to investigate the transverse cracking kinetics in [0m/90n]S cross-ply laminates made of IM7/977-2 or IMS/M21 composite systems, which are used in the aeronautic industry, from monotonic or cyclic tensile tests performed at several temperatures. An energetic cracking criterion is used. Several strain energy release rate expressions are compared, in order to obtain a realistic curve of fracture energy versus crack density. The influence of delamination and temperature on the cracking curves (crack density versus applied stress) is also considered. For the IM7/977-2 composite sysstem, the temperature effect can be accounted for using the time-temperature superposition principle, by constructing master curves of equal damage. A transition from monotonic cracking to fatigue cracking is investigated. Experimental results and simulations of transverse crack growth during fatigue tests are presented. The cracking criterion uses a fracture energy expression stemming from an extension of Vinogradov’s model which relies upon a simple assumption regarding the shape of first cracking S-N curves, and takes into account the R-curve effect