Rozprawy doktorskie na temat „Propergols composites”
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HEUILLET, PATRICK. "Caracterisation de l'endommagement des propergols solides composites". Compiègne, 1992. http://www.theses.fr/1992COMP0460.
Pełny tekst źródłaHeuillet, Patrick. "Caractérisation de l'endommagement des propergols solides composites". Compiègne, 1992. http://www.theses.fr/1992COMPD460.
Pełny tekst źródłaMarcilloux, Jérôme. "Contribution à l'étude de charges organiques pour matériaux composites à matrice élastomère : modification de surface de particules de polystyrène réticulées et encapsulation d'hydrocarbures polycycliques". Mulhouse, 1995. http://www.theses.fr/1995MULH0365.
Pełny tekst źródłaBoulé, Philippe. "Contribution de la fractographie quantitative à l'étude de la rupture dynamique de propergols et d'explosifs composites". Metz, 1988. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1988/Boule.Philippe.SMZ881.pdf.
Pełny tekst źródłaTests of Quick traction (20m/s) are achieved to determine the mechanical properties of cristal energetic materials. A fractographic analysis of the aspects and of the sections of rupture is undertaken in order to characterize the mechanisms of rupture. Experimental means such as the Vicom analyser of numerical images, the macrophotographic bench, the scanning electron microscope, the video camera have been used. Thanks to a statistical analysis of measure results of the constraints (tests of dynamical traction) and of microstructural parameters (fractal analysis), we study the influence of those microstructural parameters on the behaviour to the rupture of propergols and compound explosives
Boulé, Philippe Pluvinage Guy. "Contribution de la fractographie quantitative à l'étude de la rupture dynamique de propergols et d'explosifs composites". [S.l.] : [s.n.], 1988. ftp://ftp.scd.univ-metz.fr/pub/Theses/1988/Boule.Philippe.SMZ881.pdf.
Pełny tekst źródłaBoulé, Philippe. "Contribution de la fractographie quantitative à l'étude de la rupture dynamique de propergols et d'explosifs composites". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37612080j.
Pełny tekst źródłaNevière, Robert. "De l'application des critères énergétiques globaux de la mécanique de la rupture à l'étude des explosifs et propergols solides composites". Vandoeuvre-les-Nancy, INPL, 1989. http://www.theses.fr/1989NAN10440.
Pełny tekst źródłaToulemonde, Paul-Aymé. "Etude de la relation microstructure/propriétés mécaniques jusqu’à rupture des propergols composites : Caractérisation expérimentale et modélisation micromécanique par éléments finis". Thesis, Paris, ENSAM, 2016. http://www.theses.fr/2016ENAM0038/document.
Pełny tekst źródłaThis work aims at understanding the relationship between solid propellants particles volume fraction, particles size distribution, binder mechanical properties and binder/particles bonding with the mechanical behavior up to failure of these materials. Finite elements analyses on 2D microstructures are performed in order to qualitatively characterize the microstructure evolution throughout uniaxial tensile loading at small strain rate. These simulations account for the binder/particles debonding with a cohesive zone model and implement an original failure criterion. Simulation and experimental results are consistent. Besides, a quantitative comparison between simulations on 3D microstructures and experimental data is drawn in order to validate the above qualitative results. It is performed on a model composite and compares both the mechanical behavior and the volume variations. At last, the propellant failure during a peeling test of the liner/propellant structure is studied experimentally
Giasson, Luc. "Développement des méthodes de calcul et de mesure de la courbe J-R d'un composite polymère particulaire propergol / : par Luc Giasson". Thèse, [Chicoutimi : Rimouski : Université du Québec à Chicoutimi] Université du Québec à Rimouski, 2003. http://theses.uqac.ca.
Pełny tekst źródłaBibliogr.: f. 107-112. Document électronique également accessible en format PDF. CaQCU
Bernigaud, Pierre. "Modélisation de la combustion des matériaux énergétiques nouvelle génération". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAE017.
Pełny tekst źródłaUsed in civil and military rocket engines, composite propellants are characterized by a heterogeneous structure at the microscopic level. They consist mainly of oxidizer particles embedded in a polymer matrix known as the binder. The binder maintains the structural integrity of the propellant, and produces via its pyrolysis gases whose combustion is responsible for most of the heat release within the flame. The combustion products of the oxdizer particles oxidize the fuel generated by the binder.Ammonium perchlorate (AP) is a widely used oxidizing agent in composite propellants, mainly in association with a polymer binder such as hydroxytelechelic polybutadiene (HTPB). Next-generation propellants could include nitramines in their composition, such as hexogen (RDX), as a partial replacement for AP for certain specific purposes. In particular, reducing the amount of AP contained in the propellant can limit the formation of a visible trail at the engine exhaust, reducing the vehicle's signature.In this thesis, we propose to revisit the studies carried out on the combustion of conventional AP/HTPB propellants, and to characterize the effect of RDX inclusion in their composition.To this end, the first part of the thesis is dedicated to the development of combustion models for the ingredients under consideration: AP, homogenized AP/HTPB blend, and RDX.A chemical kinetics mechanism is assembled, capable of representing the chemical processes characteristic of the combustion of all these energetic materials. For each ingredient, a condensed-phase decomposition model is also formulated, to be associated with the kinetic mechanism. One-dimensional simulations are then carried out using a coupled flame/solid approach, in order to validate the whole on available experimental data.Due to their heterogeneous structure, the study of composite propellant combustion requires the use of multidimensional numerical methods. A second part of the thesis is therefore dedicated to the development and validation of a 2D calculation code, enabling the simulation of the combustion of an oxidizer particle surrounded by a layer of binder, in an axisymmetric configuration.In a final section, the combustion models and the computational code are used in conjunction to study the effect of RDX inclusion in a conventional AP/HTPB propellant. For the first time, the flame structure produced by such AP/HTPB/RDX propellant is obtained and characterized. The effect of pressure and RDX particle size on propellant regression is investigated, demonstrating the existence of different combustion regimes. Recommendations are made for optimizing the performance of this type of composition
Kiyoshi, Shimote Wilson. "Modélisation des phénomènes d'ablation de l'insert d'une tuyère de moteur-fusée à propergol solide. Approche expérimentale et numérique". Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2016. http://www.theses.fr/2016ESMA0028/document.
Pełny tekst źródłaThe main objective of this study is understand the ablation mechanisms in the presence of a critical environment in pressure and temperature within a solid propellant rocket motor. The well-known parameters, aluminum percentage in the flow, adiabatic flame temperature and the consequent heat flux in front of the geometry of the insert and its thermochemical properties are studied from anumerical and experimental strategy. The ablation phenomenon, which occurs at the nozzle insert during the operation of the solid propellant rocket motor, is th us studied and results of tests of the small and full-scale motors are presented as well as numerically simulated. Indeed, tests carried-out provide results on the conditions of the material of the insert before and after firing tests, do not allow is to provide a complete analysis of the development of the mechanisms involved during the running time of the engines. To introduce these rather complex physical phenomena a strategy of progressive development is followed. Initially, a 1D model treated the heat transfer equations using a multi-block numerical discretization technique. From the 1D method, simple expressions to represent the evolution of the ablation and pyrolysis fronts are defined. These expressions are then used directly on the treatment of axisymmetric problems and confronted with simulations of the scale motor. Finally, the immersed boundary method is applied to tackle coupling between flow and heat transfer on the insert, highlighting the phenomenon of ablation. The numerical simulations reproduce the experimental results and show a robust numerical methodology, corresponding to expectations in what concerns the evaluation of the ablation phenomenon within a solid propellant rocket motor nozzle
Longuet, Baptiste. "Etude expérimentale et numérique du comportement d’un propergol composite soumis à un échauffement lent". Orléans, 2008. http://www.theses.fr/2008ORLE2051.
Pełny tekst źródłaTrombini, Marion. "Couplage endommagement-grandes déformations dans une modélisation multi-échelle pour composites particulaires fortement chargés". Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2015. http://www.theses.fr/2015ESMA0002/document.
Pełny tekst źródłaThis study is devoted to multi-scale modeling of highly-filled particulate composites.This method, the “Morphological Approach” (M.A.), is based on a geometrical and kinematicalschematization which allows the access to both local fields and homogenized response. In order toevaluate the predictive capacities of the M.A. considering a linear elastic behavior for the constituentsand evolution of damage, analysis is performed regarding the ability of the M.A. to accountfor particle size and interaction effects on debonding chronology. For that purpose, simple periodic,random monomodal and bimodal microstructures are considered. The results are consistent withliterature data : debonding of large particles occurs before the one of smaller particles and thehigher the particle volume fraction, the sooner the debonding. Finally, the objective is to operatethe coupling of two non linearities which were separately studied in previous versions of the M.A. :debonding between particles and matrix, and finite strains. The whole analytical background of theapproach is reconsidered in order to define the localization-homogenization problem. The nucleationcriterion is extended to the finite strains context. The final problem, strongly non linear, is numericallysolved through a Newton-Raphson algorithm. The different solving steps (jacobian matrix,coding with Python®) are developed. Progressive evaluations (sound and damage materials) allowthe validation of numerical implementation. Then, size and interaction effects are reproduced infinite strains
Nait-Abdelaziz, Moussa. "Ténacité dynamique d'un propergol solide composite aspects expérimentaux et théoriques". Grenoble : ANRT, 1985. http://catalogue.bnf.fr/ark:/12148/cb375950050.
Pełny tekst źródłaNinous, Jacques. "Comportement viscoélastique et endommageable d'un propergol composite solide : application au dimensionnement d'une charge de propergol soumise à une sollicitation d'origine thermomécanique". Bordeaux 1, 1995. http://www.theses.fr/1995BOR10609.
Pełny tekst źródłaPicquart, Marion. "Développement d’une loi de comportement pour les méthodes de dimensionnement des chargements en propergol solide composite". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASC019.
Pełny tekst źródłaThis work describes the development of a viscoelastic nonlinear constitutive law for solid composite propellants. An experimental basis showing the nonlinear behavior expressed by solid propellants is constructed. Then, microscopic sources of this macroscopic behavior are investigated using new samples specifically designed. Results show that friction and cavitation are responsible for the major parts of the nonlinearities. Homogenization is used to determine mathematical relations between these two mechanisms and the mechanical properties of the material. The relations are then integrated in a viscoelastic, isotropic, tridimensional model. Parameters are identified using the experimental basis. The model shows a good ability to reproduce and predict the propellant behavior nonlinearities expressed under cyclic loads. After completion of the development, the model is used into a design method and finite element calculation are performed on real objects. Results validate the new method and show that improving the behavior prediction also improves the design method and generates profits
Pascal, Jérôme. "Vitesse de combustion d'un propergol solide composite en présence d'oscillations de la vitesse de l'écoulement". Paris 11, 1987. http://www.theses.fr/1987PA112066.
Pełny tekst źródłaPascal, Jérôme. "Vitesse de combustion d'un propergol solide composite en présence d'oscillations de la vitesse de l'écoulement". Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37608678w.
Pełny tekst źródłaMateille, Pierre. "Analyse multi-échelle des phénomènes d'endommagement d'un matériau composite de type propergol, soumis à un impact de faible intensité". Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2010. http://tel.archives-ouvertes.fr/tel-00797604.
Pełny tekst źródłaGiasson, Luc. "Développement des méthodes de calcul et de mesure de la courbe J-R d'un composite polymère particulaire propergol / : par Luc Giasson". Thèse, 2003. http://constellation.uqac.ca/702/1/17906270.pdf.
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