Letteratura scientifica selezionata sul tema "Elasticité et Conductivité Thermique"
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Articoli di riviste sul tema "Elasticité et Conductivité Thermique":
Djadouf, Samia, Nasser Chelouah e Abdelkader Tahakourt. "Influence de la distribution en taille (broyat de noyaux d’olive) sur les propriétés de la brique". Matériaux & Techniques 107, n. 4 (2019): 403. http://dx.doi.org/10.1051/mattech/2019024.
Gosse, Jean. "Conductivité thermique d'un liquide saturé polyatomique et non polaire". International Journal of Heat and Mass Transfer 31, n. 2 (febbraio 1988): 295–300. http://dx.doi.org/10.1016/0017-9310(88)90012-9.
Kinany-Alaoui, M., L. Piraux, V. Bayot, JP Issi, P. Pernot e R. Vangélisti. "Conductivité électrique et thermique des composés du graphite insérés aux réactifs magnétiques". Journal de Chimie Physique 88 (1991): 2001–6. http://dx.doi.org/10.1051/jcp/1991882001.
Degiovanni, A., e C. Moyne. "Conductivité thermique de matériaux poreux humides: évaluation théorique et possibilité de mesure". International Journal of Heat and Mass Transfer 30, n. 11 (novembre 1987): 2225–45. http://dx.doi.org/10.1016/0017-9310(87)90217-1.
Moussahil, Abderrahim, Mohamed Farh, Abdelghani Iddar e Mohammed El Khasmi. "Impact de la densité de chargement associée au stress thermique sur les caractéristiques biochimiques de la viande chez le dromadaire". Revue d’élevage et de médecine vétérinaire des pays tropicaux 76 (1 giugno 2023): 1–6. http://dx.doi.org/10.19182/remvt.36951.
Boulanouar, A., A. Rahmouni, M. Boukalouch, Y. Géraud, I. El Amrani El Hassani, M. Harnafi e M. J. Sebbani. "Corrélation entre la vitesse d’onde P et la conductivité thermique des matériaux hétérogènes et poreux". MATEC Web of Conferences 2 (2012): 05004. http://dx.doi.org/10.1051/matecconf/20120205004.
Bourret, Francoise, Christian Fort e Georges Duffa. "Conductivité thermique de mousses cellulaires de carbone: Mesures par méthode flash et interprétation". Revue Générale de Thermique 36, n. 7 (luglio 1997): 510–19. http://dx.doi.org/10.1016/s0035-3159(97)84034-2.
HAY, B., G. DAVÉE, J. HAMEURY, O. ENOUF e L. RONGIONE. "Détermination de la diffusivité thermique et de la conductivité thermique de revêtements à haute température par la méthode flash". Revue française de métrologie, n. 24 (31 maggio 2011): 23–33. http://dx.doi.org/10.1051/rfm/2010009.
Moyne, Christian, Jean-Christophe Batsale e Alain Degiovanni. "Approche expérimentale et théorique de la conductivité thermique des milieux poreux humides—II. Théorie". International Journal of Heat and Mass Transfer 31, n. 11 (novembre 1988): 2319–30. http://dx.doi.org/10.1016/0017-9310(88)90163-9.
Azizi, S., C. Moyne e A. Degiovanni. "Approche expérimentale et théorique de la conductivité thermique des milieux poreux humides—I. Expérimentation". International Journal of Heat and Mass Transfer 31, n. 11 (novembre 1988): 2305–17. http://dx.doi.org/10.1016/0017-9310(88)90162-7.
Tesi sul tema "Elasticité et Conductivité Thermique":
Abidi, Sonia. "Matériaux composites à haute tenue thermique : influence de la micro-nanostructure sur les transferts moléculaires, électroniques et thermiques". Thesis, Toulon, 2014. http://www.theses.fr/2014TOUL0019/document.
Fire protection materials are widely used to ensure the safety of users of the infrastructure. Standards of fire protection regularly operating, the materials must be more efficient. These are generally composed of refractory mortar and insulating oxides. The objective of this work is to develop a firewall composite 4 h applied by projecting but also to determine the thermal and mechanical properties.In the first part, this study describes the various stages of the development of a fire protection material, after the presentation of the approach that has guided the development of our materials, we are interested especially in the chemical composition of the matrix and that of the cement. Their thermal and mechanical properties have been reviewed.The raw materials for the preparation of mortar were selected. The evolution respectively of thermal conductivity, diffusivity, porosity, specific heat and the mechanical properties of mortars chosen according to the nature and amount of the fillers incorporated in the matrix has been studied. A description of the various analytical and numerical models for the representation of the thermal conductivity and Young's modulus of the materials led to the development of a model able to predict the thermal and mechanical behavior of composites based on the nature and amount of charges added.In a second part, the kinetics of the hydration reaction of gypsum to control setting time and to facilitate the production of the composite in the industrial chain was studied. The influence on the kinetics of hydration, of the chemical composition of the gypsum, particle size distribution and the addition of adjuvant commonly used in the plaster industry, has also been treated.At the end of this study, two formulations of composites applied by projection were developed
Du, Kou. "Modélisation micromécanique de géomatériaux en prenant en compte des anisotropies microstructurale et matricielle". Electronic Thesis or Diss., Université de Lorraine, 2021. http://docnum.univ-lorraine.fr/public/DDOC_T_2021_0254_DU.pdf.
The mechanical properties of heterogeneous geomaterials are evaluated by simultaneously taking into account the microstructural anisotropy as well as the one of matrix. To this end, the microstructural anisotropy is represented by the complexity of porous shape which is considered in the present work as concave or convex by particular attention to the superspherical and the axisymmetrical superspheroidal pores. The concentration and contribution tensors are numerically computed using Finite Element Method (FEM), which are next approximated by analytical expressions for the case of the concavity parameter being p<1, to evaluate the associated effective properties, such as effective elastic and thermal responses. Specifically, to solve the 2nd Eshelby problem (Eshelby (1961)) in the case of 3D non-ellipsoidal inhomogeneities, we make use of a recently developed adapted boundary condition (Adessina et al. (2017)) based on far-field solution (Sevostianov and Kachanov (2011)) to incorporate the matrix anisotropy and to correct the bias induced by the bounded character of the mesh domain, which allows to accelerate the computation convergence without sacrificing its accuracy. Simultaneously by complying with the numerical homogenization technique, the compliance/resistivity contribution tensors are computed for different forms of pores (particular attention of superspheroidal and superspherical ones) embedded in a transversely isotropic matrix. The proposed numerical method is shown to be efficient and accurate after several appropriate assessments and validation by comparing its predictions, in some particular cases, with analytical results and some available numerical ones. On the basis of these "3D" Finite Element Modeling, approximate relations of the property contribution tensors in the two aforementioned reference concave cases, supersphere and axisymmetric superspheroid, are developed for both elastic and thermal problems. Note here that the spherical pore (i.e. concavity parameter p=1) and circular crack (i.e. aspect ratio γ → 0), which can be considered as two particular cases, are also numerically studied. This allows to assess and validate the proposed method in the present work. Moreover, in the frame of homogenization, application to the typical porous geomaterials with transversely isotropic matrix such as clay rocks is presented to illustrate the impact of the concavity parameter and the matrix anisotropy on overall properties through several micromechanical homogenization schemes such as non-interaction approximation, Mori-Tanaka-Benveniste scheme and Maxwell scheme. The methodology of evaluation of the elastic and thermal properties of heterogeneous material aforementioned is proposed based on micromechanical homogenization via multiscale modeling. The overall properties of composites with regular pores are also predicted using direct finite element approaches and then compared against micromechanical modeling. The effect of microstructure is analyzed by considering periodic RVEs containing random arrangements of pores formed by transversely isotropic phases
Chen, Fengjuan. "Modélisation micromécanique de milieux poreux hétérogènes et applications aux roches oolithiques". Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0134/document.
Focusing on the effect of shape factor on the overall effective properties of heterogeneous materials, the 1st and the 2nd Eshelby problem related to 3-D non-ellipsoidal inhomogeneities with a specific application to oolitic rocks have been discussed in the current work. Particular attention is focused on concaves shapes such as supersphere and superspheroid. For rocks, they may represent pores or solid mineral materials embbeded in the surrounding rock matrix. In the 1st Eshelby problem, Eshelby tensor interrelates the resulting strain about inclusion and eigenstrain that would have been experienced inside the inclusion without any external contraire. Calculations of this tensor for superspherical pores– both concave and convex shapes – are performed numerically. Results are given by an integration of derivation of Green’s tensor over volume of the inclusion. Comparisons with the results of Onaka (2001) for convex superspheres show that the performed calculations have an accuracy better than 1%. The current calculations have been done to complete his results. In the 2nd Eshelby problem, property contribution tensors that characterizes the contribution of an individual inhomogeneity on the overall physical properties have been numerically calculated by using Finite Element Method (FEM). Property contribution tensors of 3D non ellipsoidal inhomogeneities, such as supersphere and superspheroid, have been obtained. Simplified analytical relations have been derived for both compliance contribution tensor and resistivity contribution tensor. Property contribution tensors have been used to estimate effective elastic properties and effective conductivity of random heterogeneous materials, in the framework of Non-Interaction Approximation, Mori-Tanaka scheme and Maxwell scheme. Two applications in the field of geomechanics and geophysics have been done. The first application concerns the evaluation of the effective thermal conductivity of oolitic rocks is performed to complete the work of Sevostianov and Giraud (2013) for effective elastic properties. A two step homogenization model has been developed by considering two distinct classes of pores: microporosity (intra oolitic porosity) and meso porosity (inter oolitic porosity). Maxwell homogenization scheme formulated in terms of resistivity contribution tensor has been used for the transition from meso to macroscale. Concave inter oolitic pores of superspherical shape have been taken into account by using resistivity contribution tensor obtained thanks to FEM modelling. Two limiting cases have been considered: ‘dry case’ (air saturated pores) and ‘wet case’ (water liquid saturated pores). Comparisons with experimental data show that variations of effective thermal conductivity with porosity in the most sensitive case of air saturated porosity are correctly reproduced. Applicability of the replacement relations, initially derived by Sevostianov and Kachanov (2007) for ellipsoidal inhomogeneities, to non-ellipsoidal ones has been investigated. It it the second application of newly obtained results on property contribution tensors. We have considered 3D inhomogeneities of superspherical shape. From the results, it has been seen that these relations are valid only in the convex domain, with an accuracy better than 10%. Replacement relations can not be used in the concave domain for such particular 3D shape
Lachance, Olivier. "Conductivité thermique et perméabilité intrinsèque de la neige compactée". Thesis, Université Laval, 2014. http://www.theses.ulaval.ca/2014/30712/30712.pdf.
Lachance, Olivier, e Olivier Lachance. "Conductivité thermique et perméabilité intrinsèque de la neige compactée". Master's thesis, Université Laval, 2014. http://hdl.handle.net/20.500.11794/25083.
La perméabilité intrinsèque et la conductivité thermique de la neige sont deux paramètres essentiels pour effectuer l'analyse numérique du comportement thermique de milieux poreux. Plusieurs mesures de ces paramètres ont été effectuées successivement sur des échantillons de neiges compactées recueillis à l'Université Laval. La mesure de la conductivité thermique a été effectuée selon la méthode du fil chaud. Pour la perméabilité intrinsèque, un perméamètre à air à double mur fût conçu pour des expériences en laboratoire. La perméabilité intrinsèque et la conductivité thermique variaient respectivement de 1.1 x 10-8 à 8.0 x 10-11 m2 et de 0.09 à 0.48 W/mK pour des échantillons de neige ayant des porosités s'étalant entre 0.32 et 0.75. Les résultats se comparent bien avec ceux trouvés dans la littérature. Des modèles de prédiction des propriétés ont été examinés pour chacune des propriétés avec la porosité et le diamètre des grains.
Rigacci, Arnaud. "Élaboration d'aérogels de silice monolithiques et étude des relations entre leur structure et leur conductivité thermique équivalente". ENSMP, 1998. http://www.theses.fr/1998ENMP0836.
Lory, Pierre-François. "Dynamique de réseau et conductivité thermique dans les alliages métalliques complexes". Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY042/document.
Complex metallic alloys are long range ordered materials, characterized by large cells, comprising several hundreds of atoms and cluster building blocks. A key property of CMAs is the low lattice thermal conductivity (1.3 W/m. K), which suggests a potential application for CMAs for thermoelectricity. Despite recent advances structure determination, the nature of the phonons modes remains an open question: do the clusters playing a role? Are there critical modes? To tackle this problem, my PhD project aims to understand the vibrational modes at atomic scale and the relation to lattice thermal conductivity in o-Al13Co4 which is an approximant of the quasicrystal, decagonal phase AlNiCo and the clathrate Ba8Ge40.3Au5.25. In this worked we have used Inelastic Neutron and X-ray Scattering experiments and atomic scale simulations, based on density functional theory and empirical pair potentials.A detailed analysis of the results of inelastic scattering experiments on monocrystals for the acoustic branches have shown, for the first time, a finite lifetime for acoustic phonons when they interact with the low-lying dispersion-less excitations due to atoms in the cluster. In both systems, we observe that when an acoustic branch flattens near the zone boundary, the phonon lifetime is a few picoseconds. The phonon lifetime is approximately independent of temperature like the lattice thermal conductivity. Lattice and molecular dynamics simulations with DFT and empirical, oscillating pair potentials show that the finite phonon lifetime is an anharmonic effect, due to structural disorder, explaining the weak temperature of the phonon lifetime. For o-Al13Co4, we have calculated the thermal conductivity with the Green-Kubo method based on equilibrium MD simulations. For Ba8Ge40.3Au5.25 we have developed a phenomenological model based on individual phonon modes. In conclusion, we have demonstrated how structural complexity affects thermal conductivity through the lattice dynamics
Lenain, Alexis. "Conductivité thermique des alliages métalliques amorphes en conditions cryogéniques et applications". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI100.
Bulk metallic glasses possess an amorphous structure without any atomic longrange ordering unlike their crystalline counterparts. They exhibit particularproperties due to this amorphous structure, which is very promising for futureindustrial applications. In particular, their thermal conductivity is very low compared to other metallic materials due to the absence of crystalline lattice. Thus, these alloys show some insulating properties, leading to low heat losses. This PhD work focuses on understanding the mechanisms that occur in thermal conductivity of bulk metallic glasses in order to identify suitable compositions. Several optimization methods have been carried out to minimize the thermal properties and resulted in the development of an optimized composition showing low thermal conductivity. Secondly, their joining ability has been studied with the aim to implement these alloys in an industrial device. Two different joining techniques have been faced to provide a short and a long term solution. Eventually, two patents which protect the use of beneficial compositions developed in this work have been filed. Besides, prototypes have been produced using the two processes studied in this work and show enhanced performances compared to the current solution
Duverger, Eric. "Etude sous pression partielle d'oxygène et à haute température de l'évolution de la conductivité dans les structures pérovskites : application à l'étude de BaTiO3 pur et dopé en accepteur". Dijon, 1992. http://www.theses.fr/1992DIJOS031.
Azizi, Smail. "Conductivité thermique des matériaux poreux humides : mesure par méthode flash et interprétation". Vandoeuvre-les-Nancy, INPL, 1988. http://www.theses.fr/1988NAN10014.
Capitoli di libri sul tema "Elasticité et Conductivité Thermique":
DOPPIU, Stefania, e Elena PALOMO DEL BARRIO. "Ingénierie des matériaux à changement de phase pour améliorer leur performance". In Stockage de la chaleur et du froid 1, 77–116. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9133.ch5.
Parrain, Fabien, Pierre-Etienne Allain, Stéphane David-Grignot, Alain Bosseboeuf e Arnaud Walther. "Mesure de la conductivité thermique de nanofils de silicium, fortement dopés de type p, fabriqués par approche descendante, par la méthode 3 oméga". In Instrumentation et Interdisciplinarité, 291–300. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1206-6-037.
Parrain, Fabien, Pierre-Etienne Allain, Stéphane David-Grignot, Alain Bosseboeuf e Arnaud Walther. "Mesure de la conductivité thermique de nanofils de silicium, fortement dopés de type p, fabriqués par approche descendante, par la méthode 3 oméga". In Instrumentation et Interdisciplinarité, 291–300. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1206-6.c037.