Letteratura scientifica selezionata sul tema "Bois d'oeuvre – Propriétés thermiques"
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Articoli di riviste sul tema "Bois d'oeuvre – Propriétés thermiques":
Chatonnet, Pascal, e Jean-Noël Boidron. "Incidence du traitement thermique du bois de chêne sur sa composition chimique. 1ere partie : définition des paramètres thermiques de la chauffe des fûts en tonnellerie". OENO One 23, n. 2 (30 giugno 1989): 77. http://dx.doi.org/10.20870/oeno-one.1989.23.2.1725.
Tesi sul tema "Bois d'oeuvre – Propriétés thermiques":
Permadi, Pipin. "Optimisation du traitement thermique appliqué au bois d'oeuvre pour l'amélioration des propriétés des espèces non durables". Compiègne, 2000. http://www.theses.fr/2000COMP1270.
Merakeb, Seddik. "Modélisation des structures en bois en environnement variable". Limoges, 2006. https://aurore.unilim.fr/theses/nxfile/default/94578804-9926-46e0-8969-67a4656612ce/blobholder:0/2006LIMO0031.pdf.
Mechanical properties of timber constructions depend strongly on moisture content state. In this context, it is shown a mecanosorptive coupling. This climatic environment aspect imposes a hygroscopic behavior modeling in order to estimate moisture content variations by integrating the heat and mass transfer processes. If the effect of moisture content on the mechanical behavior has been studied in the literature, this work enables us to precise effects of mechanical state on the transfer laws by taking into account boundary conditions and diffusion properties. In this context, we propose a thermodynamic and experimental approaches which allow to introduce a realistic coupled transfer algorithm in a finite element software
Flity, Hassan. "Modélisation de la dégradation et combustion du bois de construction". Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0250.
The use of wood in construction offers numerous advantages, but also poses fire safety risks. Several studies available in the literature, whether experimental or numerical, have investigated the fire behavior of wood. However, the diverse and varied results do not allow the identification of the intrinsic behavior of wood, and regulatory frameworks have to rely on numerous simplifying assumptions. The objective of this thesis is to study the thermal degradation of wood at the cone calorimeter scale. The uniqueness of the study lies in the adoption of an increasingly complex approach, the use of meticulous metrology, and the most comprehensive characterization of the properties of the wood samples under investigation. Degradation involves numerous interacting processes such as drying, pyrolysis, and combustion with or without flames, resulting in heat and mass transfer. Given the complexity of studying all these phenomena simultaneously, the strategy adopted was to separate the different phenomena as much as possible through models and specific experiments. In order to overcome the problem of drying and hydric transfer, all the work was carried out on dry wood. First, specific characterization methods were used to determine the thermal properties of wood and charcoal. These experiments helped to establish behavioral laws for some of these properties, facilitating their integration into a model. Subsequently, an experimental campaign was conducted at the material scale of wood using techniques such as thermogravimetric analysis and differential scanning calorimetry under an inert atmosphere. At this scale, wood is thermally thin, which allowed the development of a kinetic model capable of predicting mass loss, mass loss rate, and heat absorbed or generated by wood during pyrolysis as a function of temperature. Next, an experimental campaign was carried out on wood samples at the scale of the cone calorimeter in an inert atmosphere to validate the 3D pyrolysis model developed to predict wood pyrolysis in the absence of combustion, driven primarily by heat transfer within the material. Finally, tests in an air environment were conducted for a comprehensive modeling of dry wood combustion, which requires a precise characterization of char combustion, the associated heat generated, and the heat flux supplied by the flame
Grioui, Najla. "Etude thermocinétique de la pyrolyse du bois : application à la pyrolyse du bois d'olivier". Nancy 1, 2006. http://www.theses.fr/2006NAN10111.
A theoretical and experimental study of thermo-kinetic of this wood particles pyrolysis has been developed. The thermophysical properties of the olive wood such as apparent density, porosity, permeability and thermal conductivity have been determined experimentally by different measurement methods. A kinetic measurements are carried out by thermogravimetric analysis in isothermal mode in the temperature range between 498 K and 648 K. The experimental curves obtained are interpreted by a kinetic model based on several decomposition stages. The kinetic model coupled with energy conservation equation leads to a non linear equations system which has been solved iteratively by using an implicit finite differences method. The obtained results are in good agreement with the available experimental data. The developed model is then applied to the pyrolysis of a cylindrical olive wood particle in different operating condition to simulate the effect of the reactor temperature and the particle size on the evolution of the temperature profile as well as the residual mass inside the thick particle
Bohnke, Isabelle. "Etude expérimentale et théorique des traitements thermiques du bois. Caractérisation physico-mécanique des bois traités". Paris, ENMP, 1993. http://tel.archives-ouvertes.fr/tel-00844044.
Ngohe-Ekam, Paul-Salomon. "Etude expérimentale des propriétés thermophysiques des bois tropicaux". Lyon 1, 1992. http://www.theses.fr/1992LYO10146.
Dias, de Moraes Poliana. "Influence de la température sur les assemblages bois". Nancy 1, 2003. http://www.theses.fr/2003NAN10157.
The more generalized use of wood for building raises concern for fire safety. The current standards require the structure stability for a minimum time to ensure the building evacuation and the fire fight. Considering that the fire endurance of wood is well-known, the stability requirement is mainly reduced to the understanding of the behaviour of wood joints on fire. The aim of this work is to study the behaviour of single-dowel timber joints and it is divided into three parts. The first part is a study of the influence of temperature on the modulus of elasticity and on the embedding strength in a range between 20 and 300 °C. In the second part the wood charring and the influence of a metallic dowel embedded in wood, is studied. In the third part, the fire behaviour of single-dowel wood joints is tackled. The first two studies have provided mechanical and thermal data to allow the development of a model to simulate the joint behaviour and its fire endurance before fracture
Vignon, Pierre. "Caractérisation et optimisation des propriétés d’isolants thermiques non tissés à base de fibres de bois". Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0182.
The works presented here fit into current context of strong commercial development potential of bio-sourced insulators. They are carried out as part of a CIFRE PhD financed by the company FINSA France. They took place at I2M laboratory in Bordeaux, within an industrial project, ECOMATFIB (ADEME BIP, 2014-2017) : ECOconception et Optimisation multi-objectif de MATériaux isolants à base de FIBres de bois. The Objective of this PhD is to design, manufacture, characterize and optimize properties of thermal insulation based on wood fibers, produced using nonwoven textile process. After analysis of wood resource present in the New-Aquitaine region, insulating materials were designed out of sheets from maritime pine, pine taeda, poplar and eucalyptus wood fibers with addition of thermoplastic fibers then thermally consolidated in hot air oven. After preliminary identification of adjustment parameters of nonwoven chain available in I2M laboratory, many fibrous materials were made from diversified raw materials and suitable machine parameters. These bio-based materials were thermally characterized mainly by hot plane method and then in hydric manner to know their ability to interact with relative humidity of ambient air. Finally, their characterization in compression made it possible to study their propensity to preserve their properties after mechanical stress. Datas collected made it possible to identify parameters of raw materials as well as manufacturing process having significant impact on properties of these insulators. A first approach to modeling properties has led to identification of avenues to improve thermal properties and to validate their very good capacity for water regulation
Alberto, Mario Michaque Miguel. "Faisabilité de composites bois-ciment destinés à la construction de maisons au Mozambique". Nancy 1, 2001. http://www.theses.fr/2001NAN10059.
Karami, Elham. "Effet de traitements thermiques modérés et de revêtement sur les propriétés vibratoires des bois d’Epicéa et de Mûrier". Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT340/document.
Wood is commonly used for making musical instruments. During the process it is often subjected to treatments, that either modify its volume or its surface properties. Two species used for for string instruments were studied, representative of different cultures: Spruce (Picea abies Karst.) used in Europe and White Mulberry (Morus alba L.) used in Iran. For each of them the effect of thermal treatment at moderate temperature (<150°C) and of coating on various physical and mechanical properties was studied. The main results are as follows. In contrast to Spruce, Morus has a very low degree of mechanical anisotropy. For both species, thermal treatment induces a strong decrease in damping, especially in R direction for Spruce, and equilibrium moisture content, without marked degradation as indicated by the very small weight loss. However, after reconditioning at high humidity, a significant part of the changes is recovered. The application of a solvent-based varnish on Morus induces a continuous stiffening, while a very strong increase in damping after application is followed, after about 2 months, by a return to values close to those of untreated wood. For Spruce, siccative oil based varnish was applied and several parameters of the process were tested. In this case, the kinetics of property stabilisation are very slow and significant changes were still observable after 5 months