Дисертації з теми "Verre – Effets de la température"
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Bernard, Cédric. "Indentation et rhéologie de verres inorganiques de 20 à 700 ° C." Phd thesis, Université Rennes 1, 2006. http://tel.archives-ouvertes.fr/tel-00402562.
Royer, Laurent. "Élaboration et caractérisation d’alliages base chrome pour applications à très haute température." Thesis, Nancy 1, 2009. http://www.theses.fr/2009NAN10016/document.
In the glass making industry, for glass wool insulation production, cobalt or nickel based alloys are used. They operate at high temperature (HT) under specific conditions resulting from glass melts contact and burner proximity. When the T exceeds 1200°C, the properties of these alloys are lost. Increasing T can only be obtained by changing the alloys’ based material. In this frame, choosing chromium alloys is relevant because of the properties its oxide Cr2O3 confers. However, due to its high brittleness at low T and its ductility at HT, Cr has to be alloyed with other elements. In this work, the oxidation behavior of Cr at 1300°C was studied. Then 3 different systems were characterized. Towards the oxidation behavior only one is compatible with a HT environment. Its characterization then its optimization as well as the study of the phenomena met at HT (oxidation, corrosion, ageing, …) were then begun
André, Stéphane. "Identification de la diffusivité phonique du verre par méthode flash de 20°C à 500°C." Vandoeuvre-les-Nancy, INPL, 1992. http://docnum.univ-lorraine.fr/public/INPL_T_1992_ANDRE_S.pdf.
The flash method is extended to the 300K to 800K temperature range. Applied to semi-transparent media (S-T-M) and associated to a theoretical study of the coupled Conductions-Radiation 1-D transient heat transfer, it allows the direct measurement of the phonic diffusivity of glass. For this reason, the contribution of either the radiative boundary conditions (black or reflecting), the sample’s thickness, or the degree of semi-transparency (absorption coefficient) has been underscored. An experimental study has been carried out on five different glasses of various Fe2O3 content and has confirmed the theoretical predictions yielded by simulations made in the case of the gray medium. The spectral dependence of the absorption coefficient (“non-gray” medium) has been taken into-account through a multi-band model. It has no influence on the measurement of the phonic diffusivity in the prescribed conditions. Finally, we propose a new expression for the phonic conductivity of float glasses as a function of temperature
Daniel, Isabelle. "Aluminosilicates à haute pression et haute température : amorphes, verres, liquides et cristaux : étude par spectroscopie Raman." Lyon 1, 1995. http://www.theses.fr/1995LYO10279.
Cornet, Antoine. "Approche multi-échelle des verres d’oxyde : évolution structurale sous hautes pressions et processus de relaxation en température." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1206/document.
The oxide glasses form a class of materials with many fundamental and industrial interesting properties. Among these particularities we find the capability of such glasses to densify. Indeed, after a compression at pressures up to around ten gigapascal, a typical oxide glass presents an increase in density and several structural changes compared to the non-compressed glass. This observation led to the birth of the polyamophism theory in the decades 1990 and 2000. In the same way that a chemical compound can exist in different crystalline structure, it has been proposed that different amorphous structure exist, and that transitions between these amorphous states are possible.During this work, we tried to evidence the structural changes associated to the possible polyamorphism in oxide glasses. To do so, we followed two different approaches. In the old fashioned way, we probed in-situ the structure of different glasses during the compression, and we determined the dependence of the processes to the temperature (GeO2 glass) and to the polymerization degree (sodo-silicate glasses). In a second time, we compressed several similar glasses to perform permanent densification. Then we relaxed these densified glasses at high temperature, and we monitored in-situ the glassy structure during the transformation.This new approach allowed us to evidence the existence of an activated state during the relaxation of densified glasses to their pristine non-densified state. This transitory state is characterized by an increase of the inhomogeneity of the structure at all length scales, and seems to confirm the polyamorphism theory in oxide glasses
Boissin, Eileen. "Etude de l'endommagement et de la tenue en fatigue d'un matériau composite à matrice acrylique et fibres de verre." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0105/document.
Thermoplastic polymer resins offer numerous benefits, such as their low cost, their better recycling and repair opportunities, their lightness and their long fatigue lifetime. This is why they are increasingly used in the composite material industry. However, due to their chemical nature, their mechanical response exhibits a temperature dependency even if the service temperature range is much lower than their glass transition temperature. This dependency has a knock-on effect, in a lower proportion but still significant, on the mechanical response of thermoplastic matrix composites. Due to the composite local stress distributions and their micro- and meso- structures, this dependency can also have a knock-on effect on their damage scenario. But structures such as wind turbine blades are brought to operate in a temperature range from -20 to 60°C. It is then necessary to study the temperature effect on the mechanical behavior and the damage scenario of thermoplastic matrix composites, to allow a better prediction of the fatigue damage evolution of wind turbine blades, in their temperature service range. Indeed, wind turbine blades are generally designed using a normative approach, which requires either consequent experimental campaigns in order to get the fatigue behavior of all the laminate composites in a structure such as a wind turbine blade, or the formulation of strongly conservative hypothesis, which affects the optimization of wind turbines blades design. To compensate this, a damage model allowing describing the strength, the stiffness and the residual strain of a unidirectional ply under quasi-static and fatigue loadings has been recently developed. The work presented here aim to validate the use of this model for a composite with an acrylic matrix reinforced with glass fibers, used for the manufacturing of some wind turbine blades in the first instance. The parameter identification and the validation rely simultaneously on mechanical tests under tensile and fatigue (tensile-tensile and tensile-compressive) loads on several layering and on physical analysis (microscope images under load, X-ray microtomography). Then, it is question to study how the temperature effect on the composite mechanical behavior and damage scenario affects the model parameters
Conrath, Élodie. "Élaboration et caractérisation de superalliages base chrome pour utilisation lors du fibrage centrifuge du verre à très haute température." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0018.
The TEL process is used to produce glass wool at very high temperature. The main piece of this process is the “spinner”, which is exposed, in service, to numerous operating constraints (oxidation, corrosion, erosion and creep). This spinner is currently made of cobalt- or nickel-based superalloys and is fabricated by casting. To fiberize new glasses or to increase the current maximal fiberizing temperature, a new type of superalloy is required. Chromium is an ideal candidate to be the principal element of a new superalloy because of its very high melting point and its ability to develop a chromia protective scale against oxidation and corrosion at high temperature, reason for which it is usually added to many classical superalloys. During this Ph.D work, the synthesis and the study of more than a hundred of chromium-based alloys with different chemical compositions was done by casting. These alloys are brittle at room temperature during their cutting. Laboratory tests of hardness at room temperature, oxidation and 3 points flexural creep at high temperature were performed. Metallographic characterisations were carried out (XRD, SEM, EPMA) on all alloys in their as-cast state, after isothermal annealing or isothermal oxidation. The detailed study of simple alloys permitted to discover some compositions removing the brittleness problem of these alloys. Then, the enrichment of the composition of the alloys by addition of new elements, allowed to correct some inherent problems of chromium-based alloys
Mofakhami, Eeva. "Effets du soudage par vibration sur la microstructure et le comportement en traction de polymères semi-cristallins renforcés par des fibres de verre." Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAE006.
Vibration welding is a common process used in automotive industry to assembly polymer parts. For pristine polymers, welding ratio, defined as the ratio between weld strength and tensile strength of non-welded material, is close to 1. However, for glass-fiber reinforced polymers, welding ratios are around 0.6 at best. In order to understand this discrepancy, several grades of polyamide (PA) 6 and 66 reinforced with 30% glass fibers as well as polypropylene (PP) with 0, 20, 35 and 50 % glass fibers have been injected in plates and vibration welded. A linear relationship was obtained between tensile strength of welded and non-welded PA specimens and their glass fiber orientation. Correlations were also found when plotting weld strength of samples regarding their welded zone thickness. In addition, voids are present only in the welded zone of glass fiber reinforced specimens, indicating that these voids are due to reorientation of fibers during the welding process. Finally, finite element modeling of mechanical behavior up to failure has been applied on a meshed specimen with a welded zone. Results show an amplification and distribution of stresses in the three directions inside the welded zone due to geometrical confinement. This generated triaxiality promotes growth and coalescence of cavities in the welded zone, explaining the weakening of the macroscopic uniaxial stress at failure
Coulon, Arnaud. "Injection des polyamides renforcés de fibres de verre longues : relations mise en oeuvre/comportement thermomécanique." Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10163/document.
The aim of this project was to optimise the material-process couple in the case of long glass fibre reinforced polyamides, so as to comply with industrial requirements of mechanicai and thermo-mechanical performance, The fibre segregation mechanisms occurring during the filling stage of the mould, which govern the local heterogeneities, have been first studied on a prototype part having a shape typical of industrial parts. A second part has focused on the flexural behavioul The modulus and maximal flexural stress have been estimated from structural models based on the multilayer morphological description (local fibre content, residual fibre lengths, fibre orientations...) of the composites. The results have been validated on an industrial part. Finally, the creep behaviour at high lemperature has been experimentally determined and then modelled (Findley's model). The need to take into account the thermal aging of the matrix in order to correct the load level during the loading time has also been pointed out
Bauchy, Mathieu, and Matthieu Micoulaut. "Contraintes topologiques et rigidité dans les verres." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00805762.
Michon, Sylvain. "Optimisation métallurgique et mécanique de superalliages base cobalt pour usage verrier à 1200°C." Nancy 1, 2004. http://www.theses.fr/2004NAN10003.
Carlier, Thibault. "Couches minces vitreuses autocicatrisantes pour applications hautes températures." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10072/document.
Glassy thin films are promising candidates as protective coating for high temperature applications. However, due to thermal and/or mechanical stresses under operating conditions, these materials may crack. Previous studies have shown that self-healing glasses in bulk form can be prepared by incorporating active particles. These latter, when damages occur in the material, oxidize at high temperature to form oxides that flow into the crack and form a “new” glass by reaction with surrounding matrix.Based on these results, our work aimed at transposing this concept to glass materials deposited as thin layers, and so to envisage coating applications. We have shown the feasibility of forming these innovative coatings composed of alternating vitreous and healing agent layers. They have been prepared by Pulsed Laser Deposition (PLD) and Electron Beam-Physical Vapor Deposition (EB-PVD). A first part of our work was devoted to the optimization of the deposition parameters and their influence on homogeneity, thickness and composition of thin films. The efficiency of the self-healing process of these composite materials was demonstrated in situ at 700°C by High Temperature Environmental Scanning Electronic Microscopy (HT-ESEM). Finally, we studied the behavior of these coatings when they were submitted to thermal cycles as well as the structural changes generated by their crystallization
Nkurunziza, Gilbert. "Performance de barres d'armature en polymères renforcés de fibre (PRF) de verre pour des structures en béton sous les effets combinés de la charge soutenue, de la température et de l'environnement humide et alcalin." Thèse, Université de Sherbrooke, 2004. http://savoirs.usherbrooke.ca/handle/11143/1765.
Lelièvre, Hervé. "STRATÉGIES DE THERMORÉGULATION CHEZ DEUX COLUBRIDÉS SYMPATRIQUES : LA COULEUVRE VERTE ET JAUNE HIEROPHIS VIRIDIFLAVUS ET LA COULEUVRE D'ESCULAPE ZAMENIS LONGISSIMUS. UNE APPROCHE INTÉGRÉE DE LA PHYSIOLOGIE À LA DÉMOGRAPHIE." Phd thesis, Université de Poitiers, 2010. http://tel.archives-ouvertes.fr/tel-00575433.
Le, Corre Benjamin. "Thermoformage du verre - Développement numérique d'un modèle thermomécanique." Phd thesis, Université de Lorraine, 2014. http://tel.archives-ouvertes.fr/tel-00975511.
Fouchier, Nathan. "Approche intégrée pour estimer la durée de vie en fatigue de pièces thermoplastiques renforcés fibres courtes dans un cadre viscoélastique haute température." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2018. http://www.theses.fr/2018ESMA0017/document.
The employment of short glass fibres reinforced thermoplastics is increasing in the automotive industry for hot environment applications. The design of components in such conditions and with this type of materials under fatigue loading must be optimized using a fatigue life assessment methodology. The heterogeneous fibres orientation distribution (FOD), due to the injection process should be considered.This work, funded by the Direction Générale de l’Armement et Région Poitou-Charentes, suggests an integrated approach from the injection process simulation to the assessment of the fatigue life at 110°C of injected components in a viscoelastic framework.The methodology here advanced is called “Through Process Modelling” (TPM). From the FOD in the component given by the injection simulation, the anisotropic effective local properties are estimated using viscoelastic homogenisation. The heterogeneous mechanical fields obtained by finite element simulations, for different types/levels of loading, are post-processed in order to get the input equivalent mechanical quantity of an energetic fatigue criterion giving the fatigue life of the component in each of these loading conditions.The identification of the fatigue criterion parameters and the validation of the whole methodology rely on an experimental fatigue database for a PA66GF30. Uniaxial tensile fatigue tests are carried out at 110°C in a climatic chamber, for 2 stress ratios (R = 0,1 and R = -1) and at 2Hz. They are performed for specimens cut out from injected plates with different orientations with respect to the flow direction.The methodology leads to very good predictions. The influence of the prediction of the FOD, input of the calculation chain, on the results is discussed
Cerdan, Florent. "Etude du vieillissement hydrique et des effets de couplages hygro-thermo-mécaniques sur le comportement d'une mousse polyuréthane renforcée par des fibres de verre au sein d'une membrane Mark III." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2017. http://www.theses.fr/2017ESMA0028/document.
The insulation of containment membrane of liquid natural gas carrier using the MarkIII membrane system, consists of load-bearing system made of panels in glass fiber reinforced polyurethane foam. The membrane is designed to resist to mechanical and thermal service load cases. As stated by IGC code regulation, and more specifically in some critical safety scenario, it has to be demonstrated that the cargo containment system will keep its integrity and main functions when subjected to water leakage through the inner hull wall (ballast).The challenge of this study is to appreciate the behavior of the reinforced polyurethane foam in immersion, which could widen the understanding of both water diffusion mechanisms and the impact of water penetration on the properties of the material.The setting up of water sorption tests at ambient temperature, according to three conditioning "free", "blocked" and "coupled" has allowed to identify a swelling law, a loading law and a damage law.In "free" conditioning, the cellular structure and the orientation of glass fibers in XY planes induce an anisotropic hygro-mechanical coupling. The swelling of Z direction has an important impact on the water solubility levels.In "blocked" conditioning, the blocking of the displacement of the faces perpendicular to the Z direction induces an increase in the internal stress levels as a function of the progression of the penetration front. In "coupled" conditioning, the sequence of the water aging and the cryogenic aging causes several damages. The damage degree is proportional to the hygroscopic swelling level of the cellular structure.The impact of these different conditionings on the durability of the material mechanical properties has been evaluated
Roblin-Semène, Laurence. "Composites "verre-supraconducteur à haute température critique"." Montpellier 2, 1994. http://www.theses.fr/1994MON20099.
Ades, Claude. "Propriétés optiques des verres silicatés à haute température." Toulouse 3, 1989. http://www.theses.fr/1989TOU30164.
Falipou, Marc. "Tribologie du contact verre-métal à haute température : Application au formage du verre creux." Ecully, Ecole centrale de Lyon, 1998. http://bibli.ec-lyon.fr/exl-doc/TH_T1752_mfalipou.pdf.
The hollow glass forming process requires a periodic lubrication of the metallic parts in contact with glass. As this lubrication induces many process defects, the objective of this study is to propose new outlooks in order to reduce it to 48 hours. A first step consists in building experimental tools, on the basis of the examination of the present industrial system, dedicated to the tribological study of two different contacts. The first tool, called loading sensor, allows the in vivo investigation (directly on the forming machine) of the dynamic contact, representative of the loading step of the parison inside the blank mould. A complementary mechanical modelling justifies the pertinence of this apparatus. A second tool, called glass press apparatus, allows to investigate at a laboratory scale the glass to metal sticking phenomenon representative of the blank demoulding. A second step exposes the experimental results obtained with model and industrial substrates, in both dynamic and static situations. We observe that those contacts are essentially dependant on three parameters : the formation process of a transition layer between the glass and the metallic oxides coming from the substrate, the thickness of this oxide layer, and at least in the case of the dynamic contact, the surface morphology of the substrate. The formation kinetic of the transition layer depends on the nature of the oxides at the interface and on the glass viscosity. All the experimental observations, linked with the glass moulding material requirements, finally allow to formulate industrial proposals
Tsiava, Remi. "Détermination des profils de température dans les verres silicatés fondus : étude et mise au point d'une méthode originale." Toulouse 3, 1990. http://www.theses.fr/1990TOU30004.
Kataya, Zeinab. "Effets de température sur les nanoparticules de CoAg : structure et effets de ségrégation." Phd thesis, Université d'Orléans, 2013. http://tel.archives-ouvertes.fr/tel-01004367.
Zeller, Roland. "Préparation à basse température de verres riches en silice à partir de gels." Mulhouse, 1987. http://www.theses.fr/1987MULH0074.
Duffrene, Lucas. "Comportement viscoélastique d'un verre silico-sodocalcique dans le domaine des températures intermédiaires : approche phénoménologique et modélisation en triaxialité." Paris, ENMP, 1994. http://www.theses.fr/1994ENMP0515.
Biron, Isabelle. "Effets de l'irradiation sur la séparation de phase et sur la viscosité dans un verre B₂O ₃-PbO." Paris 11, 1988. http://www.theses.fr/1988PA112417.
Ji, Hui. "Mécanique et physique de l’indentation du verre." Rennes 1, 2007. http://www.theses.fr/2007REN1S154.
In order to characterize the mechanical behaviour of glass using small size specimens, we develop methods based on the use of indentation, in particular the Vickers indentation which is by far the most common. Such tests cause high hydrostatic stresses in the glass in the area of application of the load. The glass lieing characterized by a relatively low atomic packing density compared with crystals for example, the induced pressure, which is typically of several GPa, cause densification of glass. Thus, in a first step, we studied the behaviour of glasses of different compositions at high pressure (up to 25 GPa) and we then studied the indentation behaviour by using these results. The work was focused on four types of glass – a soda-lime-silica window glass, a silica glass (SiO2), a chalcogenide glass (GeSe4) and a bulk metallic glass (Zr55Cu30Al10Ni5) – as well as a synthetic clay (plasticine), which proved to be an excellent model material for studying the rheology of glass at the macroscopic scale. All these results helped to propose a mechanism of deformation of the glass by indentation, with two separate processes (densification and shear-thinning viscous flow), whose contributions are highly dependent on the composition, through Poisson’s ratio
Mieusset, Roger. "Effets de la température sur les fonctions testiculaires et épididymaires." Paris 11, 1992. http://www.theses.fr/1992PA11T022.
Hérisson, Didier. "Mesures de relations de fluctuation-dissipation dans un verre de spin." Paris 11, 2002. https://tel.archives-ouvertes.fr/tel-00002055.
Boloré, Damien. "Création et nucléation de bulles lors de la montée en température de verres recyclés mis en contact." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066267/document.
This thesis focuses on the bubbles population that appears between two glass pieces when heated at 1100 °C without any reactive raw materials. Understanding the mechanisms involved in the transition from dissolved gas to gas is still a fundamental issue of materials science. Industrially, bubbles are the major sources of defects in the final glass product and the amount of recycled glass introduced in glass furnaces will likely increase.We have studied the life of a bubble at different times, from its creation to its growth behavior, and to its rise in the molten glass. We show that homogeneous nucleation cannot exist in molten glass because chemical reactions are not able to generate the needed supersaturations by themselves. Thus, right after glass transition, glass flow is responsible for the entrapment of gas pockets, which then become natural precursors of bubbles.We model the supersaturation at the interface between two glasses, and we show its influence over the number of stable nuclei that can form bubbles.We also model the growth dynamic by using the same characterization of glasses' oxidation states than for nucleation. We experimentally show that bubbles located at the interface between a reduced glass and an oxidized glass grow faster than bubbles located in an oxidized glass only. The main effect of the interaction between the two glasses is to move the sulfur equilibrium towards the formation of gaseous SO2.Finally, using X-rays and an optical flow algorithm, we present a new experimental setup which measure velocity fields in an opaque medium to assess bubbles ability to promote glass mixing
Manel, Stéphanie. "Modélisation de la durée de développement pré-imaginal chez les poïkilothermes sous régime de températures variables." Lyon 1, 1995. http://www.theses.fr/1995LYO10277.
Lerbet, François. "Processus cohérents et temps de relaxation dans des verres magnétiques à très basse température : étude par acoustique propagative." Paris 11, 1987. http://www.theses.fr/1987PA112026.
We study the acoustical properties of amorphous magnetic insulators for varying concentration of magnetic impurities between 10,1 % at. And 1,5 % at. . We use a method of propagating wave between 10 MHz and 1000 MHz at very low temperature (from 10 mK up to 10 K) and for magnetic fields up to 60 kOe. With the choice of Ho3+ ions as magnetic impurities, we have been able to point out low energies activated movements of magnetic entities (V 5 K) which are not related at the spin glass transition. The study of tunnelling states in these glasses shows that their classical description in the insulators is no more valid here and that we must take into account the "direct" interaction between tunnelling states and magnetic impurities
Jabrane, Saïd. "Influence de la composition, de la température et du temps sur la fonction enthalpique du verre." Lyon, INSA, 1996. http://www.theses.fr/1996ISAL0011.
The enthalpic representation of glass using pressure and temperature only is not very satisfactory since it leads to contradictions like the Kauzmann paradox. The question raised therefore is that of the thermodynamic variables necessary to properly characterize the glassy state. To answer this question, we studied in a first stage the variations of the glass transition temperature Tg of propanediol 1. 2 and glycerol as a function of heating and cooling rates using DSC. The results showed that the glass transition is reversible in equilibrium conditions (zero heating and cooling rates). Then, the study of the influence of thermal annealing on the enthalpy of the glycerol glass was carried out. The DSC study revealed an enthalpic effect (exothermic) during annealing. This effect was attributed to a physico-chemical transformation involving molecular associations. Therefore, the thermodynamic properties of glass are a function, not only of temperature and pressure, but also of the extent of transformation of the latter transformation. On this view, the fictive temperature, largely used in literature, is the expression in terms of temperature of the extent of transformation. The thermodynamic origin of glass was further emphasized in the study of the variations of Tg with composition in two out of equilibrium phase diagrams (glycerol-propanediol 1. 2 and glycerol-water). Finally, the construction of the out of equilibrium phase diagram composed of the two propanediol 1. 2 enantiomers suggested that liquids (such as propanediol 1. 2) for which crystallization is impossible or very difficult are very likely mixtures of several molecular forms. The reason why they do not crystallize is therefore structural and not kinetic
Bouakkaz, Rachid. "Altération aqueuse et hydratation en phase vapeur du verre SON68 à basse température (35-90°C)." Thesis, Nantes, Ecole des Mines, 2014. http://www.theses.fr/2014EMNA0168/document.
The SON68 glass is initially altered in dynamic mode under silica rich COx water (42 mg/L) at pH8, high S/V ratio (14000 m⁻¹) and at 35, 50 and 90°C. The results showed that the glass alteration seems to be governed by both diffusion and surface reaction process. The residual rate at 90°C is around 10-4 g.m⁻².d⁻¹. The activation energy is about 70 kJ.mol⁻¹. The dissolution /precipitation and hydrolysis/condensation mechanisms are responsible for the development of the alteration layer. Mg silicates and calcites precipitate at 35 and 50°C, the same phases in addition to powellite and apatite precipitate at 90°C. The results predicted by the model reproduce well experimental data. The glass is then hydrated at temperatures ranging from 35 to 125°C and relative humidity values (RH) between 92 an 99.9%. The glass hydration increases with the temperature and RH, the hydration energy is about 34.2 kJ.mol⁻¹. The alteration layers thicknesses vary between 0.3μm at 35°C and 5μm at 125°C. The alteration layer is depleted in (B, Li, Na) and enriched in (Si, Al, Fe, Zn and Ni). The secondary phases are calcite, powellite, apatite and tobermorite in adition to a hydration gel. The effect of near field materials on the ²⁹Si doped SON68 glass alteration was studied. The presence of steel increases the pH and decreases the Si and Mo concentrations without changing the overall rate of glass corrosion. The Si is retained on the steel corrosion products, its concentration in solution seems to be controlled by the clay dissolution. The glass corrosion in the presence of steel and clay at 90°C leads to the formation of magnetite, siderite, ironsilicates, pure silica, iron sulphur (pyrite, troilite,pyrrhotite and mackinawite), calcite, apatite, powellite and Mg silicates. The modelling results agree well with the experimental data
Roussy, Laurent. "Étude du comportement des matériaux composites aux températures cryogéniques." Besançon, 1994. http://www.theses.fr/1994BESA2050.
Daviller, Guillaume. "Etude numérique des effets de température dans les jets simples et coaxiaux." Phd thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2010. http://tel.archives-ouvertes.fr/tel-00573368.
Jean-St-Laurent, Mathilde. "Effets des cycles extrêmes de température sur le comportement des matériaux composites." Master's thesis, Université Laval, 2014. http://hdl.handle.net/20.500.11794/26398.
This master dissertation presents the effect of extreme temperature cycles on composite materials of carbon fiber and cyanate-ester resin made of five harness woven fabrics. Three laminates and one sandwich plate were studied. The evaluation of damage present in the laminates showed two different types of damage: vertical microcracks and debonding between the fibers and the matrix. Debonding is only visible on the edges of the laminates. As for the microcracks, they are present both on the edges and inside of the laminates, but in greater quantity on the edges. The damage inside the sandwich plate is present under two forms: vertical microcracks and delamination due to the presence of the adhesive. The effect of thermal cycling on the degradation of the mechanical properties of the laminates was also studied. The mechanical tests performed showed that properties influenced by the matrix behavior were altered by the presence of microcracks.
Gaimes, Nabil. "Etude de la dynamique vibrationnelle des milieux désordonnés par diffusion inélastique de la lumière : application à des verres stabilisés à différentes températures." Montpellier 2, 1992. http://www.theses.fr/1992MON20225.
Bouhanek, Karima. "Oxydation à haute température de superalliages monocristallins." Toulouse, INPT, 1997. http://www.theses.fr/1997INPT016G.
Ishiguro, Naoko. "L'influence du climat et des affluents sur l'oxygénation et la turbidité des lacs : le cas comparé du Léman, des lacs alpins et japonais." Limoges, 2004. http://www.theses.fr/2004LIMO2002.
Fasquelle, Didier. "Développement de méthodes de caractérisations à larges gammes de fréquences et de températures : application à des matériaux : verres ioniques, diélectriques et ferroélectriques." Littoral, 2003. http://www.theses.fr/2003DUNK0099.
Bendavid, Georges Simon. "Effets du vieillissement des préimprégnés verre/polyester sur la moulabilité et les propriétés mécaniques." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0019/MQ46645.pdf.
Volland, Antoine. "Etude des effets d'échelle sur le comportement mécanique de film mince en verre métallique." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00872887.
Koo, Min. "Effets de température dans les procédés de gravure plasma : Aspects fondamentaux et applications." Phd thesis, Université Joseph Fourier (Grenoble), 2008. http://tel.archives-ouvertes.fr/tel-00355029.
Ghasemzadeh, Hasan. "Couplages dans les géomatériaux multiphasiques : effets de la température et de la chimie." Phd thesis, Ecole des Ponts ParisTech, 2006. http://pastel.archives-ouvertes.fr/pastel-00002077.
Mykytczuk, Nadia, Leo Leduc, Jack T. Trevors, and Garry D. Ferroni. "Effets des facteurs environnementaux du drainage minier acide sur les membranes d'Acidithiobacillus ferrooxidans." Acfas-Sudbury, 2007. https://zone.biblio.laurentian.ca/dspace/handle/10219/96.
Reyt, Françoise. "Influence de la température sur la liaison calcium-protéine." Bordeaux 2, 1997. http://www.theses.fr/1997BOR2P017.
Hillers, Maike. "Cristallisation dans un verre d'aluminosilicate de calcium : effet du bore et apport de techniques in situ." Orléans, 2007. http://www.theses.fr/2007ORLE2054.
Hammouda, Tahar. "Mécanismes et cinétique de fusion partielle d'assemblages à Fluor-Phlogopite : modélisation, expérimentation et implications géochimiques." Orléans, 1995. http://www.theses.fr/1995ORLE2015.
Clementin, de Leusse Catherine. "Etude de fibres de verre E. Caractérisation expérimentale par spectrométrie Brillouin et test de modèles de fibrage." Montpellier 2, 2000. http://www.theses.fr/2000MON20083.
Baril, Eugénie. "Quantification de l'influence de l'environnement sur la formation et la thermo-résistance des spores bactériennes." Brest, 2011. http://www.theses.fr/2011BRES2047.
The aim of this PhD study was to quantify the influence of the sporulation environment (temperature, pH and aw) on the spore formation of Bacillus weihenstephanensis and B. Licheniformis and on their heat resistance. A two-step sporulation methodology was developed to study sporulation in environmental conditions close to growth boundaries. Sporulation boundaries (temperature, pH and aw) were observed inner growth boundaries. A primary model was proposed to quantify the influence of the environment on spore formation. A decrease in sporulation temperature and pH delayed the time to first spore per ml. The maximal spore heat resistance was observed for spores produced at temperature and pH close to the optimal growth values. A secondary model was then proposed and validated to estimate the spore heat resistance as function of the sporulation and heat treatment environments. Finally, this study allows defining control points in foodstuff to prevent spores in food products. A relationship between the influence of environmental temperature and pH on growth and sporulation was pointed out