Literatura científica selecionada sobre o tema "Céramiques de blindage"
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Artigos de revistas sobre o assunto "Céramiques de blindage"
Khemis, Sabri Ben. "Mesure térahertz de faibles épaisseurs et détection de défauts aux interfaces pour les revêtements industriels : Avancées et applications". e-journal of nondestructive testing 28, n.º 9 (setembro de 2023). http://dx.doi.org/10.58286/28483.
Texto completo da fonteTeses / dissertações sobre o assunto "Céramiques de blindage"
Zinszner, Jean-Luc. "Identification des paramètres matériau gouvernant les performances de céramiques à blindage". Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0337/document.
Texto completo da fonteSince the sixties, ceramics are commonly used as armour materials. Indeed, thanks to their interesting physical and mechanical properties, they allow a significant weight benefit in comparison to monolithic steel plate armours. However, the microstructure of the ceramic may have a strong influence on its penetration resistance. Based on characterisation tests and on the use of four silicon carbide grades, this work aims to highlight the links between the microstructure and the ballistic efficiency. Experimental compressive and spalling tests are based on the use of the GEPI device. For studying the compressive dynamic behaviour, it allows using the lagrangian analysis method and characterising the yield strength of the material. For studying the tensile dynamic behaviour, it allows assessing the strain-rate sensitivity of the spall strength. An analysis of the fragmentation process is performed based on Edge-On Impact tests. Moreover, an innovating impact test on fragmented ceramics has been designed and performed. The different experimental results allow a better understanding of the influence of the ceramic microstructure on its behaviour under the different loadings. All the experimental data have been compared to numerical results allowing validating the constitutive models. The DFH (Denoual-Forquin-Hild) damage model of brittle materials showed very good capacities to simulate the tensile dynamic behaviour of ceramics (spalling and fragmentation)
Duplan, Yannick. "Caractérisation expérimentale et modélisation des propriétés de rupture et de fragmentation dynamiques d'un noyau de munition et de céramiques à blindage". Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALI075.
Texto completo da fonteSome ceramic grades, such as silicon carbide (SiC) or alumina (Al2O3), are used as ballistic materials thanks to their excellent mechanical performances, such as their hardness, while being light, where weight gain is a major issue for the design of military equipment for personal and vehicle protection. Since the Vietnam War, ceramics have been largely used and integrated as front face in bilayer shielding to stop the threat of AP (Armour Piercing)-type projectiles during a ballistic impact. Nevertheless, the projectile leads to an intense damage in the ceramic due to, amongst other phenomena, a dynamic tensile loading that manifests by multiple cracking, called fragmentation, particularly unfavourable for the integrity of the ballistic protection and its capacity to deal with a second impact. In order to develop a more performing shielding material, it is essential to understand the link between the microstructure of ceramics, the damage generated under impact and their ballistic performances.This thesis seeks to better understand the dynamic fragmentation phenomenon generated at high strain rates in high fracture-toughness ceramics, including a bio-inspired alumina material mimicking nacre microstructure. This artificial nacre is, a priori, more crack resistant than conventional ceramics as it is characterised by a high static fracture-toughness due to its specific “Brick-and-Mortar” (or BM) microstructure reproduced in the material called here MAINa
Genevois, Julia. "Etude du comportement de céramiques à blindage sous chargement de compression haute-vitesse par essais d’impact de plaque plan ou sans choc". Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALI106.
Texto completo da fonteCeramic materials are widely used in armour or protective structures providing weight savings for equivalent performance compared to their steel counterparts. In these conditions, they experience extreme damage, micro-plasticity and fragmentation mechanisms. To fully understand these behaviours, characterization under high-strain-rate compression needs to be conducted. Several experimental techniques, such as the plate-impact test, are used to investigate the dynamic behaviour of ceramic under high compressive loading. During this experiment, a flyer plate (often made of a metallic material) strikes the target, and some mechanical properties such as the HEL (Hugoniot Elastic Limit) as well as the Hugoniot curve of the material can be deduced from the rear side velocity measured at the back of the target. Nevertheless, this test do not provide a controllable loading-rate in the target and the hardening behaviour cannot be directly deduced.One of the aims of this thesis was to develop and implement an experimental shockless plate-impact configuration enabling Lagrangian Analysis. The various experimental campaigns were carried out using the 3SR laboratory launcher. The use of wavy flyer plates to generate a loading ramp was validated using tests on 316L steel, which has the asset of not changing phase in the range of studied stresses. Two ceramics, F99.7 alumina and Forceram SiC, were then studied in this configuration. These tests coupled with Lagrangian analysis enable to obtain the curve of axial stress as a function of axial strain beyond the HEL.At the same time, some other plate impact configurations were developed to characterise the temporal profiles of axial and radial stresses in the ceramic. This configuration is based on the use of Manganin piezoresistive gauges. These tests were carried out on steel and alumina targets. The results were compared with the ones obtained by rear side velocity measurements during the same tests.The experimental results from the thesis were compared with numerical finite element simulations based on a JH2-type (Johnson–Holmquist) plasticity model. These calculations were used to identify the parameters of the ceramic behaviour model thanks to an inverse approach. It helps providing a better understanding of the mechanical behaviour of these materials under such loading conditions. Nevertheless, other tests, in particular triaxial tests, could be further considered in order to complete the identification of a constitutive model for these microstructures under intermediate confinement pressures
Rossiquet, Gilles. "Carbure de silicium pour application blindage : élaboration et étude du comportement à l'impact". Thesis, Dijon, 2012. http://www.theses.fr/2012DIJOS103.
Texto completo da fonteCeramics are a key component in multilayer armor structures. Their low density, typically two to three times lower than steel, combined with a high compressive strength make them essential materials for lightweight armor solutions. Silicon carbide is a promising material for this application due to its particularly low density and high hardness, even among other ceramics. However, armor performance is controlled by more than just the composition and understanding the link between the ceramic microstructure and the fragmentation process during the impact is essential to produce optimized and high performance materials for armor applications.Four dense silicon carbide grades with various microstructures have been used, including three produced during this work. For that, two sintering modes (solid state sintering and liquid phase sintering) and two sintering processes (pressureless sintering and spark plasma sintering) have been used. Particular care has been taken with ceramic processing in order to produce different homogenous and dense microstructures. Silicon carbide parts have been produced at a sufficient size for the application. They were submitted to microstructural characterization (scanning and transmission electronic microscopy, X-ray diffraction, elemental cartography, chemical analysis) and mechanical characterization in quasi-static mode (hardness, toughness, module of rupture, Weibull modulus) and dynamic mode. Dynamic fragmentation of silicon carbide grades has been studied by means of Edge-On Impact (EOI) experiments. A first configuration enabled the study of the damage process that spreads out within the tile thanks to an ultra-high speed camera. A second ‘sarcophagus’ configuration was used to enable observation of the target fragmentation, i.e., crack patterns and crack densities. It has been observed that the microstructure of ceramics plays a key role in the damage intensity generated during impact. A good match with a simulation using the Denoual-Forquin-Hild (DFH) anisotropic damage model has been highlighted. Another experimental configuration implying a double impact on ceramics has been used to characterize the resistance of the damaged target. In parallel, ballistic experiments with 7.62 x54mmR API B32 and 7.62x51mm AP8 threats have been performed. Microstructure of ceramics has been shown to play an important role on ballistic performance
Riou, Pascal. "Contribution à l'étude de l'endommagement du carbure de silicium lors d'un impact de basse énergie : application aux blindages". ENSMP, 1996. http://www.theses.fr/1996ENMP0707.
Texto completo da fonte