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Bordonne, Pierre Antoine. "Module dynamique et frottement intérieur dans le bois : mesures sur poutre flottantes en vibrations naturelles". Vandoeuvre-les-Nancy, INPL, 1989. http://www.theses.fr/1989NAN10387.
Pełny tekst źródłaGhibaudo, Marion. "Influence des propriétés mécaniques du substrat sur l'adhésion et la migration cellulaire". Phd thesis, Université Paris-Diderot - Paris VII, 2008. http://tel.archives-ouvertes.fr/tel-00345790.
Pełny tekst źródłaDwi, Argo Bambang. "Détermination expérimentale de l'influence de l'hystérésis sur les propriétés hydriques de matériaux poreux du génie civil". Toulouse, INSA, 1994. http://www.theses.fr/1994ISAT0031.
Pełny tekst źródłaCadenas, Herrera Pedro Vicente. "Influence du pré-endommagement en fatigue endurance sur les propriétés mécaniques statiques d'un alliage d'aluminium 6082-T6". Electronic Thesis or Diss., Lille 1, 2009. http://www.theses.fr/2009LIL10005.
Pełny tekst źródłaThe present work has been conducted to study the effect of cumulative high cycle fatigue damage, on the tensile mechanical properties, toughness and hardness, of an AA6082-T6 aluminium alloy. Axial fatigue tests under load controlled conditions (R = 0.1) up to different fatigue life fractions achieved at maximum stresses of 200, 250 and 275 MPa were carried out. Cumulative damage has been determined from the S-N curve of the material and the Palmgren-Miner Iinear rule. Samples with different cumulative damage were subsequently subjected to tensile, tear and microindentation tests. The evolution of the different properties as a function of the cumulative damage has been reported in relation to the reference values of such properties in the undamaged state. The results obtained show that the tensile mechanical properties do not exhibit a significant change as a function of the cumulative damage, whereas the critical toughness properties decrease as damage increases. The decrease in toughness is more marked as the maximum stress applied to the material decreases. Such a decrease in toughness is associated with the presence of microcracks that are nucleated at grain boundaries and it is more pronounced as the hardness of the material increases (work-hardening). Such a phenomenon gives rise to a modification of the fracture mode, from ductile, for the undamaged material, to a mixed ductile-brittle mode after cumulative damage. The change of the different mechanical properties with cumulative damage allowed the determination of the isodamage curves for the alloy, which could be employed for predicting the high cycle fatigue remnant life of the material under investigation
Cadenas, Herrera Pedro Vicente. "Influence du pré-endommagement en fatigue endurance sur les propriétés mécaniques statiques d'un alliage d'aluminium 6082-T6". Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10005/document.
Pełny tekst źródłaThe present work has been conducted to study the effect of cumulative high cycle fatigue damage, on the tensile mechanical properties, toughness and hardness, of an AA6082-T6 aluminium alloy. Axial fatigue tests under load controlled conditions (R = 0.1) up to different fatigue life fractions achieved at maximum stresses of 200, 250 and 275 MPa were carried out. Cumulative damage has been determined from the S-N curve of the material and the Palmgren-Miner Iinear rule. Samples with different cumulative damage were subsequently subjected to tensile, tear and microindentation tests. The evolution of the different properties as a function of the cumulative damage has been reported in relation to the reference values of such properties in the undamaged state. The results obtained show that the tensile mechanical properties do not exhibit a significant change as a function of the cumulative damage, whereas the critical toughness properties decrease as damage increases. The decrease in toughness is more marked as the maximum stress applied to the material decreases. Such a decrease in toughness is associated with the presence of microcracks that are nucleated at grain boundaries and it is more pronounced as the hardness of the material increases (work-hardening). Such a phenomenon gives rise to a modification of the fracture mode, from ductile, for the undamaged material, to a mixed ductile-brittle mode after cumulative damage. The change of the different mechanical properties with cumulative damage allowed the determination of the isodamage curves for the alloy, which could be employed for predicting the high cycle fatigue remnant life of the material under investigation
De, la Cruz Sanchez Carmen Mariella. "Mesure des constantes élastiques du bois d'épinette noire (Picea mariana (Mill.) B.S.P.) dans des conditions d'équilibre du séchage à basse température". Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/23550/23550.pdf.
Pełny tekst źródłaThe objective of this research was to study the influence of the equilibrium moisture content (EMC) and temperature on the mechanical properties of black spruce wood (Picea mariana (Mill.) B.S.P.). The six specimen technique was used to determine the elastic parameters under eight hygrothermal conditions: four EMC (7%, 13%, 17% and above the fiber saturation point) at two temperatures (30°C and 50°C). Measurements were made in axial compression tests. Axial strain was measured using a Sangamo DG1.0 linear displacement sensor (LVDT). Transverse strain was measured using two semi-ring extensometers. The results show than wood deformability increases as EMC and temperature increase. Furthermore, at the given EMC, wood deformability increases as temperature increases from 30°C to 50°C.
Inscrite au Tableau d'honneur de la Faculté des études supérieures
Couteau, Béatrice. "Modélisation 3D par la méthode des éléments finis du fémur humain. Application à l'étude des prothèses sur mesure". Toulouse 3, 1997. http://www.theses.fr/1997TOU30113.
Pełny tekst źródłaSteyer, Philippe. "Influence des éléments d'alliage sur les propriétés mécaniques, la résistance à la corrosion et la passivation de grilles positives des batteries au plomb destinées au véhicule électrique (Ca, Sn, Ag et dans une moindre mesure, In et Ge)". Nancy 1, 1997. http://docnum.univ-lorraine.fr/public/SCD_T_1997_0146_STEYER.pdf.
Pełny tekst źródłaCheikho, Karim. "Conception de structures souples élastiques et applications en biomécanique". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0147.
Pełny tekst źródłaThe selection of the most-suitable porous bone scaffold for regenerative medicine applied to a given clinical application is challenging, which has motivated numerous studies especially for the repair of bone defects. Several designs have been proposed over the last decade, including structures with pore size gradients that have been proved to facilitate nutrient transport from the periphery to the core of the scaffold, and therefore to enhance tissue regeneration. The framework used to design such porous scaffolds with pore size gradients is limited by the range of the reachable pore distribution and mechanical properties.In this work, we presented a design framework to generate various three-dimensional porous scaffolds structures including cylindrical graded scaffolds from the transformations of unit cells. We proposed a methodology to generate porous scaffolds by multilayer repetition of circular cross sections, resulting in tunable anisotropy depending on the intended clinical application. We identified the apparent mechanical properties of different porous scaffold configurations using an original numerical method, highlighting the versatility of the design procedure that allows for separate tuning of longitudinal and transverse mechanical properties of porous scaffold.In order to investigate the ability of common additive manufacturing techniques to fabricate the proposed structures, we have elaborated scaffolds using FDM (fused deposition modeling) and SLA (stereolithography) techniques, we have performed experimental mechanical tests to be confronted to the predictions issued from simulations. In spite of the geometrical differences observed between the initial design and the obtained structures, the apparent properties of the structures obtained by the SLA technique agree with those predicted by the proposed computational method.Promising perspectives have been proposed concerning the design of self-fitting scaffolds that can be used for clinical applications, particularly to repair bone defects using mini-invasive surgery
Caprio, Silva Gustavo. "L' identification de propriétés de matériaux à partir des mesures de champ utilisant la modélisation par éléments finis avec accent sur la caractérisation d'erreurs expérimentales déterministes". Saint-Etienne, EMSE, 2009. http://www.theses.fr/2009EMSE0008.
Pełny tekst źródłaProgresses in Finite Elements, and Optical Full Field Measurement techniques, in particular their treatment of a large number of data points and their ability to visualize strain variations have made possible the identification of more realistic material/structure properties on direct industrial parts. This thesis describes the implementation of a Finite Element Model Updating strategy employed for the identification of material/structures properties. A special effort is made to map accurately and efficiently experimental data points into the FE model. Some original developments were also made to take into account several deterministic experimental phenomena. An estimate of statistical confidence intervals is described. Applications are given for the identification of elastic orthotropic properties of composite materials using a classical standard test on a structure. Last, the thesis is concluded with a case study using stereo-correlation on an industrial airplane part
Lion, Maxime. "Influence de la température sur le comportement poromécanique ou hydraulique d'une roche carbonatée et d'un mortier : études expérimentales". Lille 1, 2004. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2004/50376-2004-61-62.pdf.
Pełny tekst źródłaBaeza, Guilhem P. "Nanocomposites industriels simplifiés : analyse structurale et propriétés mécaniques". Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20047/document.
Pełny tekst źródłaIn this thesis, we study nanocomposite materials made of non vulcanized rubber (styrene-butadien copolymer “SBR”) reinforced by highly dispersible silica nanofillers. In order to identify physico-chemical mechanisms responsible for such a reinforcement and being able to optimize it, we must understand existing correlations between the material macroscopic properties and the multi-scale structure of the filler.For this purpose, a wide campaign of small angle X-ray scattering (SAXS) and electronic microscopy experiments have been performed. Coupling this data with Monte-Carlo simulations led to the emergence of a concept describing the silica morphology: A branched tridimensional network built up from aggregates (radius 50 nm) made of nanoparticles (radius 10 nm) spreading accross the whole sample.The analysis of the reinforcement in nanocomposites is based on rheometry and dynamic mechanical analysis. Other techniques like dielectric spectroscopy, nuclear magnetic resonance, thermogravimetric analysis or infra-red spectrometry contributed as well to fully characterize these materials, particularly to probe the SBR chains dynamic at the interface with the filler.In order to reveal the correlations between structure and properties, we systematically described the impact of key parameters such as filler fraction, polymer grafting or the chain molar mass on the silica morphology (aggregates size, …) as well as on the mechanical behavior (elastic modulous, …) of the composites. This work allowed identifying the polymer grafting density as the parameter defining the filler structure and playing a significant role on the reinforcement.This thesis, firmly focused on fundamental comprehension, contributes to the development of a general law describing the effect of the filler structure on the performance of tires. The latter must provide answers to engineering issues concerning wear resistance, wet grip or rolling resistance.Moreover, in order to obtain additional information regarding the rubber-silica interactions, we developed an experimental process allowing the production of “model” systems reinforced with colloidal silica. The use of such filler, very well defined in terms of size and shape, makes much easier the structural analysis giving the opportunity to investigate deeper the effective potential between the two phases during the composite production
Perlot, Céline. "Influence de la décalcification de matériaux cimentaires sur les propriétés de transfert : application au stockage profond de déchets radioactifs". Toulouse 3, 2005. http://www.theses.fr/2005TOU30211.
Pełny tekst źródłaCementitious materials have been selected to compose engineering barrier system (EBS) of the french radioactive waste deep repository, because of concrete physico-chemical properties: the hydrates of the cementitious matrix and the pH of the pore solution contribute to radionuclides retention; furthermore the compactness of these materials limits elements transport. The confinement capacity of the system has to be assessed while a period at least equivalent to waste activity (up to 100. 000 years). His durability was sustained by the evolution of transfer properties in accordance with cementitious materials decalcification, alteration that expresses structure long-term behavior. Then, two degradation modes were carried out, taking into account the different physical and chemical interactions imposed by the host formation. The first mode, a static one, was an accelerated decalcification using nitrate ammonium solution. It replicates EBS alteration dues to underground water. Degradation kinetic was estimated by the amount of calcium leached and the measurement of the calcium hydroxide dissolution front. To evaluate the decalcification impact, samples were characterized before and after degradation in term of microstructure (porosity, pores size distribution) and of transfer properties (diffusivity, gas and water permeability). The influence of cement nature (ordinary Portland cement, blended cement) and aggregates type (lime or siliceous) was observed: experiments were repeated on different mortars mixes. On this occasion, an essential reflection on this test metrology was led. The second mode, a dynamical degradation, was performed with an environmental permeameter. It recreates the EBS solicitations ensured during the resaturation period, distinguished by the hydraulic pressure imposed by the geologic layer and the waste exothermicity. This apparatus, based on triaxial cell functioning, allows to applied on samples pressure drop between 2 and 10 MPa and temperature from 20 to 80°C. Water permeability evolution relating to experimental parameters, uncoupled or coupled, was relied to mortars microstructural modifications
Belkadi, Salima. "Mesure des déplacements et déformations en trois dimensions par stéréoscopie : applications au comportement de mousses synthétiques". Poitiers, 2002. http://www.theses.fr/2002POIT2256.
Pełny tekst źródłaThe aim of this work is the study of the behaviour in compression of the synthetic foam of polyurethane (PU), polyethylene (PE) and polypropylene (PP), we have used the stereoscopic principle associated with two optical methods; the techniques of correlation and the technique of tracking-marks. They permit the 3D reconstruction of specimen surface at the interested points then the determination of 3D displacements and deformations during solicitation. The stereoscopic dispositif requires a calibration to determine its intrinsic parameters (lens, pixel size, distortion coef) and extrinsic parameters (orientation and position of CCD cameras). We have studied two configuration of stereoscopic system; parallel case and classic case (crossed optical axes). For the compression tests, we have used the technique of tracking-marks, which is simple to realise. This permitted us to identify the behaviour law of HILL used for the simulation of compression with finite elements code ABAQUS - IMPLICITE
Shinde, Krushna. "Interval uncertainty method to treat inconsistent measurements in inverse problems". Thesis, Compiègne, 2021. http://www.theses.fr/2021COMP2594.
Pełny tekst źródłaThe inverse problem consists of finding the parameter values of a physical model given a set of measurements. In mechanical engineering problems, material behavior’s characterization requires an inverse method to identify the material parameters. The deterministic identification problem is generally sensitive to data, and one way to resolve this issue is to consider uncertainties in the data. While several such methods exist in the literature, most of them use least-square minimization or Bayesian approaches. This thesis explores how non-probabilistic uncertainty (interval-based) approaches can help obtain a solution to the inverse problem, particularly when measurements are inconsistent with one another. Our approachintrinsically differs from the previously mentioned ones. It does not rely on minimizing the average error but rather on selecting a subset of consistent measurements. The identification strategy is based on the set theory developed, which allowed us to take into account both prior information about the parameters and measurement uncertainty in the form of sets (interval or boxes) during the inversion process. In this strategy, we developed some indicators of consistency of the measurements to characterize inconsistent measurements, i.e., outliers in the data. We applied this strategy to identify the elastic parameters of an isotropic material. The main advantage of this strategy is that it helps to obtain a feasible set of parameters, but that it can also detect the outliers among noisy measurements. The strategy is subsequently combined with surrogate modeling for identification problems in high dimensional settings. We also applied our strategy to detect damage in the material
Zhao, Han. "Analyse de l'essai aux barres d'hopkinson. Application a la mesure du comportement dynamique des matériaux". Marne-la-vallée, ENPC, 1992. http://www.theses.fr/1992ENPC9225.
Pełny tekst źródłaBergonnier, Sandra. "Relation entre microstructure et propriétés mécaniques de matériaux enchevêtrés". Paris 6, 2005. https://tel.archives-ouvertes.fr/tel-00136408.
Pełny tekst źródłaBergonnier, Sandra. "Relations entre microstructure et propriétés mécaniques de matériaux enchevêtrés". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2005. http://tel.archives-ouvertes.fr/tel-00136408.
Pełny tekst źródła- Une analyse du procédé de crêpage à partir de vidéos numériques permettant de déterminer localement les champs de taux de déformations au sein de la crêpeuse et de quantifier la cinématique d'une crêpeuse.
- Une analyse du produit fini : à partir de photos de produit texturé, un outil de détermination de l'anisotropie locale a été mis en place. Cette anisotropie est liée aux performances mécaniques du produit. Cette interaction a été mise en évidence expérimentalement et une modélisation du comportement mécanique élastique anisotrope du matériau étudié a été proposée.
Blanchard, Bastien. "Mesure des propriétés mécaniques de la peau humaine : variations sous l'effet de différents stress". Electronic Thesis or Diss., Pau, 2023. https://theses.hal.science/tel-04582559.
Pełny tekst źródłaSkin is the envelope of the human body, acting as our body's first protective barrier. The mechanical properties of human skin play a key role in skin integrity, as they confer its ability to remain intact to the cutaneous tissue. Measuring the mechanical properties of the skin therefore has many benefits, such as providing a method for objectively assessing the effects of medical or cosmetic products, and for quantifying skin pathologies that could affect them.In this context, a specific instrument for assessing the mechanical properties of human skin ex vivo has been developed. The aim of this equipment is to characterise both the conventional mechanical properties obtained from a tensile test at a constant stretching rate, and the two mechanical components, elasticity and dissipation, obtained from a mechanical spectrometry test, in order to discriminate each phenomenon. The proposed approach is to establish a phenomenological link between viscoelasticity and skin structure.The first part of the thesis was devoted to instrumental work to ensure that the equipment accurately and reliably measures the mechanical properties of deformable tissues. Its development and continuous improvement finally enabled these properties to be characterised on ex vivo human skin explants.Initial tests on ex vivo human skin explants enabled to confront and adapt the instrumentation with the study of biological samples. Firstly, preliminary studies were carried out on pre-conditioning, pre-tension state and mechanical anisotropy, to validate the reliability of the instrumentation and the methods developed. Once all these concepts had been studied, the viscoelastic properties of the explants were fully characterised. This characterisation also enabled to study their viability over time and the notion of skin ageing.This patented device, combined with the use of ex vivo skin explants under physiological conditions for several days, has finally allowed to assess the effect of different stresses on the mechanical properties of the skin. A study of stretch marks revealed that these damaged areas of skin were characterised by high mechanical anisotropy and had degraded viscoelastic properties. In addition, a study of explant freezing, a process used to preserve tissue over time, showed that freezing the skin appears to have a slight stiffening effect on its mechanical properties. Finally, the effect of enzymatic stress on the skin, mimicking a natural process of accelerated tissue ageing, was studied. This last study demonstrated a significant deterioration in the mechanical properties of explants exposed to proteolytic enzymes: collagenase and elastase. A link with histological analyses is proposed.The various studies carried out during this thesis have shown that this instrumentation can contribute to answering scientific and technical questions and could help in the development of products intended for treatments. Indeed, it could be used to objectively analyse and assess the effects of various external stresses (exposure to UV rays, chemical or atmospheric pollution, incisions, etc.) and the effects of medical or dermo-cosmetic products (moisturising creams, stretch mark creams, healing dressings, etc.) on the viscoelastic properties of human skin
Banchet, Julien. "Mesure du parametre acoustique non lineaire dans les solvants et les polymeres". Lyon, INSA, 2000. http://www.theses.fr/2000ISAL0042.
Pełny tekst źródłaDuring this study, a finite amplitude technique was developed to measure the BI A non linear parameter and applied to three solvent families - 1-alkanols, cetones and esters - and to two polymers. Thanks to an acoustic lens, the signal is focused on the sample and the second order amplitude is measured. Then, for each studied liquid or solid, the non linear parameter is calculated. Results on liquids showed that the BI A parameter changes with the chain length and depends on the speed of sound. A theoretical model was developed and applied to 1-alkanols. Experimental results fit the model. Two polymers were then tested showing the potentiality of this technique
Guichard, Antoine. "Impacts d'icebergs sur une structure massive". Paris 6, 1992. http://www.theses.fr/1992PA066168.
Pełny tekst źródłaSimon, Coraline. "Méthodologie pour le durcissement et l’accélération d’essais sur composites à matrice céramique aéronautiques". Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0681/document.
Pełny tekst źródłaWith the aim of an introduction in civil aeronautics, the certification of Ceramic Matrix Composites (CMC)requires to demonstrate the correct behavior of the material during the whole lifetime of the aircraft (about50000h), in high-temperature oxidizing environments and under the stress levels required by the applications.The goal of this thesis is to identify a methodology to accelerate ageing tests in order to get, in shorterdurations, results that are representative of the behavior of the material in standard conditions. The studiedcomposite includes a self-healing matrix which efficiency is linked in a complex way to temperature andhumidity. A thorough understanding of degradation mechanisms is therefore required in order to identifyrelevant accelerating levers. The influence of the selected test parameters (water partial pressure, type ofmechanical loading, frequency of cyclic loading, temperature) on the damage kinetics has been analyzed, whilechecking that the damage mechanisms were not modified. Non destructive monitoring techniques are essentialto quantify in real time the damage level of materials under different test conditions: acoustic emissionmonitoring has been used, and an original method of damage monitoring using electrical resistivity has beendeveloped. Two electromechanical models were proposed, describing the evolution of electrical resistance atroom temperature and under oxidizing conditions. Lifetime estimations based on these techniques led topropose a methodology towards accelerated testing on CMCs
Langbour, Patrick. "Rigidité de l'arbre sur pied, indicateur de l'élasticité longitudinale du bois : application aux peupliers". Vandoeuvre-les-Nancy, INPL, 1989. http://www.theses.fr/1989NAN10200.
Pełny tekst źródłaKossman, Stephania. "Indentation instrumentée multi-échelles de matériaux homogènes et multi-matériaux". Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10180/document.
Pełny tekst źródłaThe mechanical properties (hardness and elastic modulus) can be studied at different scales as a function of the composition and microstructure of materials (number of phases, constituent distribution, grain size…). In this work, we studied this mechanical response at the nano, micro and macroscopic scales, through different instruments that allow to apply loads ranging from 20 mN up to 2 kN generating penetrations depths between 100 nm up to 2.5 mm. The first stage consisted in the improvement of the experimental conditions, developing and interpreting the experimental data, following a rigorous metrological methodology, in order to achieve the connection between the results obtained at the three studied scales. These tests were performed in metallic industrial materials, which are sufficiently homogeneous at the tested penetration depths (steels and aluminum alloy). For example, we had proposed an alternative approach to the Oliver and Pharr method to fit the unloading curve to estimate the elastic modulus. Afterwards, this methodology is applied to the study of the response obtained by indentation in a composite material, which is highly heterogeneous, used in the fabrication of brake pads in the railway industry. The obtained results (spatial distribution on the surface and through the volume of hardness and elastic modulus) are going to be valuables in the applications of models to study the squeal noise during braking, looking to reduce its effects
Delmas, François. "Influence des traitements thermiques sur les propriétés mécaniques d'un alliage AIMgSiCu". Toulouse 3, 2002. http://www.theses.fr/2002TOU30141.
Pełny tekst źródłaMamao, Gouveia Giovanni. "Identification temporelle d'efforts sur des systèmes multicorps flexibles". St Etienne du Rouvray, INSA, 2008. http://www.theses.fr/2008ISAM0015.
Pełny tekst źródłaLiao, Hanlin. "Etude de l'influence des conditions de projection thermique sur les propriétés mécaniques de revêtement cermets". Besançon, 1994. http://www.theses.fr/1994BESA2021.
Pełny tekst źródłaThe object of this work was to analyse the relations between the spraying conditions and coating's mechanical properties including the abrasive resistance, friction behaviour and residual stress repartition. Several cermet coating were realized using different thermal spraying methods : APS (Atmospheric plasma spraying), VPS (Vacuum plasma spraying), HVOF (High velocity oxy-fuel flame spraying). New techniques like HVOF with natural gas were used and good results were obtained. The curvature method was used to determine the repartition of the residual stress in the coating and the substrate. Based on the materials mechanics, a computer program was established for this calculation. The results show that the specimen temperature history during spraying is a very importante parameter. The results of the friction test clearly show the influence of the coating structure : the WC/Co coatings deposited with APS have a smaller friction coefficient than that sprayed with VPS et HVOF. When rubbed against AL2O3/TiO2 coatings. An addition of a metal in the ceramic coatings can decrease the friction coefficient when acting as a solide lubrication phase. For the abrasive resistance, the HVOF coatings is best, followed by the APS coating and at last the VPS coating. In the APS and HVOF coatings the interaction phases M6C and M12C seem to reinforce the adherence between the carbide and the matrix. This study has also made evident that the residual stresshave an influence on the abrasive resistance ; the weaker the tensile stress in the coating, the better its resistance to abrasion
Le, Prince Vincent. "Marche aléatoire sur un groupe : propriétés dimensionnelles de la mesure harmonique". Phd thesis, Université Rennes 1, 2004. http://tel.archives-ouvertes.fr/tel-00008442.
Pełny tekst źródłaDuong, Anh Vu. "Etude expérimentale du comportement mécanique de renforts composites tissés lors de la mise en forme sur géométries non développables". Orléans, 2008. http://www.theses.fr/2008ORLE2035.
Pełny tekst źródłaFeuerstein, Matthieu. "Influence de la microstructure sur les propriétés mécaniques de tôles d'aluminium AA5182". Saint-Etienne, EMSE, 2006. http://www.theses.fr/2006EMSE0023.
Pełny tekst źródłaIn this PhD, two grades of AA5182 aluminium rolled sheets were analyzed: the REF or reference grade and the SHF or super high formability. Due to its least Fe- and Mn-content, SHF grade has a slighter particles fraction than REF grade. Interdistances between particles are smaller along TD than along RD. REF grade is less ductile than SHF grade, and sheets are more ductile along TD than along RD. The first step of the damage model was dedicated to the loading analysis corresponding to the necked area of a tensile sample. The second step of the damage model consisted in a cellular model whose geometry represents a periodic array of particles. The boundary conditions applied to the unit cell correspond to the loading determined in the first step. The predicted values of local ductility confirmed the experimental results
Ghibaudo, Marion. "Influence des propriétés mécaniques du substrat sur la migration de l'adhésion cellulaire". Paris 7, 2008. https://tel.archives-ouvertes.fr/tel-00345790v2.
Pełny tekst źródłaCell adhesion and migration play a significant role in numerous cell mechanisms, from morphogenesis to metastasis. It is well known that the cell micro-mechanical environment has a strong influence on multiple cell functions such as adhesion, migration and also differentiation. To control the cell environment properties, we chose to combine micro-fabrication techniques, adapted from micro-electronics, with cell and molecular biology. We focused on the influence of substrate stiffness on cell, here fibroblasts, migration and forces on their matrix. For that, we used flexible micro-pillars as force detectors. We showed that cells adapt the forces they exert on their substrate to its rigidity. We then studied the influence of substrate topography on cell migration. We also used micro-posts, but with higher dimensions (5 to 10 times larger). Migrating cells encounter fiat and bumpy surfaces when migrating. We showed that in these environments, cells adopt a behavior close to the one observed in a 3D environment, and also that the nucleus stiffness is involved in this behavior. Then we did a preliminary work on spreading cells in these environments
Amlil, Mohand. "Mesure et analyse des propriétés mécaniques d'un composite carbone-époxy à partir d'un dispositif de sollicitations harmoniques". Bordeaux 1, 1990. http://www.theses.fr/1990BOR10617.
Pełny tekst źródłaTupin, Simon. "Caractérisation de l'effet de la microstructure collagénique sur le comportement mécanique global des peaux reconstruites". Ecole nationale d'ingénieurs (Saint-Etienne), 2015. http://www.theses.fr/2015ENISE032.
Pełny tekst źródłaThe aim of this thesis is the multi-scale study of the mechanical and structural properties of artificial skin. Firstly, an experimental device was designed to evaluate the mechanical properties at macroscopic scale (indentation and relaxation tests). Bi-axial study of the stiffness of different layers through depth was performed with an original device based on continuous stiffness measurements. Combination of bi-photonic confocal microscopy with a tensile test permitted the assessment of the Poisson coefficient of the reconstructed tissues, stresses and tensile forces of the collagen fibers network. Results of the studies revealed the suitability of the developped experimental tools to study aging mechanism and microstructure effects on the global mechanical behavior of artificial skin
Vladkov, Mihail. "Modélisation des effets d'interface sur les coefficients de transport: propriétés mécaniques des polymères, propriétés thermiques des nanofluides". Phd thesis, Université Claude Bernard - Lyon I, 2007. http://tel.archives-ouvertes.fr/tel-00176186.
Pełny tekst źródłaNous avons développé une méthode d'étude locale de la dynamique dans un fondu de polymère. Ceci a permis d'expliquer les mécanismes impliqués dans la réponse d'un fondu pur à une excitation mécanique externe. Dans le cas d'une interface paroi polymère nous avons montré que la présence de chaînes greffées ralentit localement la dynamique et augmente la densité d'enchevêtrements dans une couche interfaciale de l'ordre de la taille des chaînes. En absence de greffage et pour une surface plane la dynamique est accélérée et la densité d'enchevêtrements diminue. L'étude d'un fondu enchevêtré chargé par des particules de taille inférieure à celle des polymères a montré que l'attraction charge polymère mène à une augmentation effective de la densité d'enchevêtrements à travers des réticulations créées par les charges. Ces phénomènes expliquent le renforcement dans les polymères chargés mesuré à haute température en absence d'effets vitreux.
Par l'étude des effets d'interface sur les transferts thermiques dans un nanofluide nous avons établi une méthode de mesure de la résistance thermique particule-fluide. Nous avons montré que la conductivité est bien prédite par un calcul de milieu effectif. L'effet du mouvement brownien est négligeable et l'augmentation de la conductivité de ces fluides est due à des effets collectifs (agrégation) des particules.
Guillon, Valérie. "Sur l'origine de la compensation du retrait de polymérisation dans les formulations à base de polyester insature et de polyacétate de vinyle". Lille 1, 1994. http://www.theses.fr/1994LIL10178.
Pełny tekst źródłaNguyen, Tien Dung. "Étude de la zone d'interphase " granulats calcaires poreux-pâte de ciment" : Influence des propriétés physico-mécaniques des granulats; Conséquence sur les propriétés mécaniques du mortier". Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-00849595.
Pełny tekst źródłaZemzemi, Chadi. "Élastographie par retournement temporel : mesure des propriétés mécaniques des tissus biologiques par réseau de sources d’onde de cisaillement". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1217/document.
Pełny tekst źródłaThis thesis is in line with shear-wave elastography research. After, a bibliographic review, an experimental study shows that the resolution on ultrasound elastography is of the same order of magnitude of the echography resolution and its limit exceeds the shear-wavelength. The original aspect of this work is the use of a phased array of mechanical sources to generate and control shear waves. A time reversal mirror of six shakers is set up. This device shows a space-time control of shear-wave field in gelatin-graphite phantom. Compared to the use of a single source, this phased array of shear-wave improves by 10dB the signal to noise ratio. Using this method on human skull model shows the possibility to deliver and control shear waves in brain using bone conduction. Finally, the application of this method on shear-wave elastography of abdominal layers is shown by a study on synthetic model and in vivo on a healthy volunteer
Zemzemi, Chadi. "Élastographie par retournement temporel : mesure des propriétés mécaniques des tissus biologiques par réseau de sources d’onde de cisaillement". Electronic Thesis or Diss., Lyon, 2018. http://www.theses.fr/2018LYSE1217.
Pełny tekst źródłaThis thesis is in line with shear-wave elastography research. After, a bibliographic review, an experimental study shows that the resolution on ultrasound elastography is of the same order of magnitude of the echography resolution and its limit exceeds the shear-wavelength. The original aspect of this work is the use of a phased array of mechanical sources to generate and control shear waves. A time reversal mirror of six shakers is set up. This device shows a space-time control of shear-wave field in gelatin-graphite phantom. Compared to the use of a single source, this phased array of shear-wave improves by 10dB the signal to noise ratio. Using this method on human skull model shows the possibility to deliver and control shear waves in brain using bone conduction. Finally, the application of this method on shear-wave elastography of abdominal layers is shown by a study on synthetic model and in vivo on a healthy volunteer
Heinisch, Martin. "Résonateurs mécaniques pour la mesure de la masse volumique et de la viscosité de liquide". Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0116/document.
Pełny tekst źródłaThis thesis summarizes the author’s recent work on the topic of mechanical resonators for liquidviscosity and mass density sensing, which were achieved between 2010 and 2015 in the course of aninternational joint doctorate program performed at the Institute for Microelectronics and Microsensorsat the Johannes Kepler University Linz, Austria and the Laboratoire de l’Intégration du Matériau auSystème in Bordeaux, France. In previous studies performed by work groups of both laboratories,the concept of using electrically actuated and read-out mechanical resonators for the determination ofliquids’ viscosities and mass densities has been established and elaborated. These works showed that theresonance frequencies and quality factors of immersed resonators are affected by the liquids’ viscositiesand mass densities, respectively. The investigated concepts included devices using structured polymeror wet-etched new silver sheets as well as micro-machined silicon and screen-printed PZT resonators.The motivation for investigating and developing such miniaturized resonators was formed, amongstothers, by their capability for in-line, in-situ and handheld-devices for laboratory as well as for industrialapplications. Especially for the latter, physical robustness, long-term stability and reliability,as well as accurate measurement results are basic requirements. To satisfy these requirements andconsidering the results and insights of earlier works, the objectives of this thesis were first, implementingrobust measuring setups featuring long-term stability and high measurement accuracy, where thelatter furthermore requires low cross-sensitivity to temperature. Second, investigating the capabilityof measuring both, a liquid’s mass density and viscosity with a single device as well as providing anestimate of achievable measurement accuracies for both quantities. And third, enabling the modelingof the performance of different viscosity and mass density sensors on the one side and their comparisonon the other side. These three specifications were accomplished by following mainly experimental approachesand investigations but also by elaborating the underlying theory of hydrodynamics, structuralmechanics, and electrodynamics. [...]
Die vorliegende Dissertation fasst die rezenten Forschungsergebnisse des Verfassers im Bereich mechanischerResonatoren für Viskositäts- und Dichtesensorik zusammen, welche zwischen 2010 und 2015 imRahmen eines international joint doctorate programs am Institut für Mikroelektronik und Mikrosensorikder Johannes Kepler Universität Linz, sowie am Laboratoire de l’Intégration du Matériau auSystème der Université de Bordeaux erreicht wurden. In den Vorarbeiten von Arbeitsgruppen beiderInstitute wurden bereits Konzepte für elektrisch angeregte und ausgelesene mechanische Resonatorenzur Bestimmung von Viskosität und Dichte von Flüssigkeiten erarbeitet und umgesetzt. Hierbei konntegezeigt werden, dass die Resonanzfrequenz und Güte eingetauchter Resonatoren abhängig sindvon Viskosität und Dichte der jeweiligen Flüssigkeiten. Die dabei untersuchten Konzepte beinhaltetenstrukturierte Polymerfolien, nass-chemisch geätzte Neusilberbleche, mikromechanisch hergestellte Siliziumstrukturen,sowie siebgedruckte PZT Resonatoren.Die Motivation zur Untersuchung und Entwicklung solcher miniaturisierter Resonatoren resultiert unteranderem aus deren Anwendbarkeit für Inline-, Insitu- und Handgeräte für Labor- bzw. industrielle Anwendungen.Besonders für Letztere sind Robustheit, Langzeitstabilität und Zuverlässigkeit, aber auchpräzise Messergebnisse Grundvoraussetzung. Um den Anforderungen der Ergebnisse und Erkenntnisseder zuvor genannten Arbeiten gerecht zu werden, wurden folgende Ziele für diese Dissertationdefiniert. Erstens, die Entwicklung robuster, langzeitstabiler Messaufbauten zur Erreichung präziserMessergebnisse, wodurch eine geringe Temperaturquerempfindichkeit als weitere Bedingung aufgestelltwurde. Zweitens sollte untersucht werden ob und mit welcher Genauigkeit sowohl Viskosität als auchDichte mit einem einzigen Instrument gemessen werden können. Drittens, sollte einerseits das Verhaltenverschiedener Viskositäts- und Dichtesensoren modelliert bzw. deren Vergleich ermöglicht werden.Basierend auf einer vorwiegend experimentellen Herangehensweise und unter Miteinbeziehung der zugrundeliegendenTheorien von Strömungs- und Strukturmechanik sowie der Elektrodynamik, konntendie o.g. Anforderungen erfüllt werden. [...]
Busignies, Virginie. "Recherche de lois de mélange sur des propriétés mécaniques de systèmes granulaires compactés". Phd thesis, Université Paris Sud - Paris XI, 2005. http://tel.archives-ouvertes.fr/tel-00012167.
Pełny tekst źródłaL'objectif de ce travail de recherche est d'évaluer les propriétés de mélanges granulaires compactés. Etant donnée la complexité du problème et la difficulté d'interprétation lorsque l'on s'intéresse à des mélanges d'excipients, les études doivent être réalisées sur des systèmes simples (mélanges binaires faisant intervenir des systèmes monodisperses). Il a donc été nécessaire d'étudier de la façon la plus complète possible les systèmes simples choisis avant de pouvoir passer à l'étude de leurs mélanges binaires.
Les excipients étudiés (A TAB®, Fast Flo®, Vivapur 12®) sont représentatifs des excipients utilisés dans le domaine pharmaceutique. Les données de la littérature ont également mis en évidence des comportements en compression très différenciés.
Le premier objectif de ce travail a donc été de caractériser de la manière la plus exhaustive possible le comportement sous pression des trois excipients ainsi que les propriétés mécaniques de ces systèmes compactés.
Les résultats obtenus sur la compressibilité des trois excipients (énergies mises en jeu au cours de la compression, consommation de la porosité, modélisation de Heckel et seuil moyen d'écoulement plastique) ont confirmé des aptitudes à la compression très différentes.
En complément, la technique de microtomographie X a été utilisée pour caractériser la fraction solide des comprimés de Vivapur 12®. Cette technique est une technique émergente dans l'étude des comprimés pharmaceutiques. Il a donc été nécessaire au préalable de la valider dans le domaine d'application dans lequel nous voulions la mettre en oeuvre (vérification de la loi de Beer-Lambert). Après une étape de calibration, une hétérogénéité au niveau de la répartition de la masse volumique a été mise en évidence au sein des comprimés, avec une différence importante entre la surface (surdensifiée) et le centre du comprimé. A la vue de ces observations, il apparaît donc que la différence entre les propriétés du volume (résistance à la rupture, module de Young, ...) et les propriétés de surface (dureté en indentation, ...) doit être faite.
Concernant les propriétés mécaniques des systèmes simples compactés (résistance à la rupture, module de Young, ténacité, dureté Brinell), des différences ont été observées entre les trois excipients pour une même propriété. De plus, pour un même excipient, des variations marquées entre les propriétés mécaniques caractéristiques du volume du compact et les propriétés mécaniques caractéristiques de la surface ont été mises en évidence.
Le modèle de la percolation qui est de plus en plus rencontré dans le domaine de la compression de composés pharmaceutiques a été appliqué aux trois systèmes étudiés. Les résultats de nos essais de modélisation semble montrer que ce modèle présente des limites. L'exposant critique ne semble pas universel pour une propriété donnée et les seuils de densité critique obtenus restent difficile à interpréter.
La deuxième partie de ce travail est consacrée à l'étude des mélanges binaires formés à partir des trois excipients étudiés dans la première partie.
Le suivi de l'évolution de la porosité des mélanges (à une contrainte de compression donnée) en fonction de la composition massique du mélange a permis de mettre en évidence une relation linéaire Porosité/Composition. Cette relation permet de déterminer la porosité d'un mélange compacté sous une pression donnée à partir des données recueillies au cours de l'étude des systèmes simples. Par contre, le seuil moyen d'écoulement plastique des mélanges n'évolue pas linéairement avec la composition massique du mélange. Mais en raison de la relation précédemment obtenue, une méthode de calcul indirect du seuil moyen d'écoulement plastique est possible. Cette méthode prédictive permet une bonne approximation des propriétés de densification et de déformation d'un mélange binaire quelle que soit sa composition.
Pour toutes les propriétés mécaniques étudiées, les lois de proportionnalités simples classiquement utilisées en mécanique ne sont pas applicables. Dans la majorité des cas, une déviation négative est même observée par rapport à ces lois simples.
Dans le cas particulier des propriétés mécaniques qui caractérisent la surface des compacts, il est apparu qu'elles étaient régies par le composé le plus plastique du mélange dès que sa proportion massique est égale à environ 30 à 20 %.
Pour s'inscrire dans une optique d'aide à la formulation, un modèle a été proposé pour décrire l'évolution du module de Young et de la résistance à la rupture en fonction de la composition du mélange. Après ajustement, une approche basée sur des interactions triangulaires et sur la probabilité de présence de ces interactions semble la plus adaptée.
Pour compléter l'étude des systèmes binaires, des essais de microtomographie X ont également été menés sur des mélanges Vivapur 12®/A TAB® compactés. Les représentations obtenues ont permis de mettre en évidence le Vivapur 12® au niveau des surfaces des compacts qui ont été en contact avec les pièces mécaniques. Ces observations confirment les résultats obtenus en microindentation sur ce mélange. Les seuils de percolation des deux excipients ont également été mis en évidence.
Depalle, Baptiste. "Influence de l’hétérogénéité des propriétés mécaniques sur la résistance de l’os trabéculaire humain". Thesis, Lyon, INSA, 2011. http://www.theses.fr/2011ISAL0060/document.
Pełny tekst źródłaFinite element modeling has become more and more suitable to estimate the mechanical properties of trabecular bone. Such models tend to be used to evaluate bone fracture risk. The main goal of this study was to create a bio-faithful model of trabecular bone to evaluate elastic stresses fields in trabeculae. In a first part, a nanoindentation study lead to a dissociation of elastic and plastic behavior of bone tissue, depending of its composition (mineral/collagen). At osteon level, bone elastic behavior mainly depends on mineral quantity whereas its plastic behavior mainly depends on collagen maturity. The relation between degree of mineralization of bone (DMB) and elastic modulus have been determined for human bone. The purpose of second part of the study was to evaluate DMB heterogeneity inside a 3D model of trabecular bone. Using 2D/3D registration, we compare the results obtain with high resolution microtomography to those from quantitative microradiography, the goldstandard method used to measure DMB. We prove that it was possible to obtain a good evaluation of mineral heterogeneity in trabecular bone by tomography. The last part of this study, is dedicated to the creation of a finite element model of trabecular bone. After analyzing the influence of finite element modeling parameter on the assessment of mechanical response (size and element formulation), we showed that the integration of mineral heterogeneity at the tissue level lead to strong modifications of stress fields in bone trabeculae. The results of this study prove that bone mineral heterogeneity is an important parameter and should be taken into account when evaluating trabecular bone mechanical properties
Depalle, Baptiste. "Influence de l'hétérogénéité des propriétés mécaniques sur la résistance de l'os trabéculaire humain". Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00815309.
Pełny tekst źródłaItul, Anca. "Interactions entre organo-silanes et client : conséquences sur l'hydratation et les propriétés mécaniques". Phd thesis, Université de Bourgogne, 2010. http://tel.archives-ouvertes.fr/tel-00656843.
Pełny tekst źródłaDesomberg, Jérôme. "Etude de l'influence des propriétés mécaniques des surfaces sur l'énergie de collage direct". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY049/document.
Pełny tekst źródłaNowadays, the microelectronics industry is seeking to develop ever more efficient components while reducing energy consumption. Planar solutions having reached their limits, 3D structures were developed to vertically stack the circuits. This requires a perfect control of the different assembly processes in which the direct bonding of thin layers of silicon oxide deposited by PECVD constitutes an interesting alternative in the sense that it allows the elaboration at low temperature of structures integrating insulating layers composed of silicon oxide.The direct bonding of silicon oxide obtained by thermal oxidation has been widely studied in the past. However, the use of deposited PECVD silicon oxides has not been so far widespread in bonded structures. The purpose of our study was to evaluate the particularities of the silicon oxide deposited in the direct bonding framework as well as the specific mechanisms involved during sealing of the bonding interface. Since direct bonding takes place by bringing these surfaces into contact at room temperature and then generally followed byconsolidation annealing, special mechanisms will take place in the oxide volume and at the bonding interface to differentiate the behaviour of the PECVD deposited silicon oxides in bonding.In this study, we assembled different oxide configurations and showed the primordial influence of water on direct bonding. It appeared that, from the ambient temperature, the water was already impacting the bonding by modifying the physicochemical and mechanical properties of the oxide subsurface. At higher temperatures, the water migrates from the oxide volume to the bonding interface allowing the closing of the bonding interfaceby exacerbating the above oxide properties. The water resulting from the closing of the bonding interface is then either stored inside cavities forming at the bonding interface or discharged into the oxide subsurface dependingon the type of oxide. It was also shown that the deposited oxide had a relatively balanced water concentration profile and could contain a significant amount of water. These findings have led to the development of two-layerstructures optimized for direct bonding. Understanding these different mechanisms provides new insights into the use of direct bonding processes for future applications
Najjar, Sanaa. "Optimisation d'alliage Fe40AlB : effet du manganèse sur la microstructure et les propriétés mécaniques". Saint-Etienne, EMSE, 2007. http://www.theses.fr/2007EMSE0016.
Pełny tekst źródłaIn spite of various interesting properties of the iron - aluminium alloys, their low ductility at room temperature strongly limits their industrial application. Until now, only doping with boron allows to remove the intergranular brittleness of these alloys. The research of the best mechanical properties led us to study the effects of the various ternary additions. Only the addition of manganese seems to be promising among a series of the studied ternary additions. In the presence of 2% Mn and compared to the binary alloy, a clear improvement of the elongation to fracture at room temperature is observed for a yield stress preserved at all the studied temperatures (20 to 900 °C). However, this effect is limited to the low manganese contents: in the presence of 5% Mn, a precipitation appears and weakens alloy. The ‘ductiling’ effect of manganese was attributed to modifications of the structure of the crystalline defects, which appear by a fall of the concentration of the thermal vacancies and a reduction of the long range order parameter. FeAlMn alloys have also been shown to present a good behavior in conditions of a thermomechanical treatment. A refinement of the grains size of Fe40Al2MnB by dynamic recrystallization at high temperatures and high strain rate could be obtained in this work
Brinkert, Luc. "Fibres creuses d'ultrafiltration : propriétés mécaniques et contrôle en ligne sur site de filage". Mulhouse, 1992. http://www.theses.fr/1992MULH0247.
Pełny tekst źródłaBinder, Royer Anne. "Etude de l'influence de la composition de l'hydroxyapatite frittée sur ses propriétés mécaniques". Grenoble INPG, 1990. http://www.theses.fr/1990INPG0031.
Pełny tekst źródłaBertheux, Brigitte. "Etude mécanique de la compression de flocons de fibres : application à la mesure du "degré d'ouverture"". Mulhouse, 1989. http://www.theses.fr/1989MULH0103.
Pełny tekst źródłaImbert, Laurianne. "Effets de l'ostéogénèse imparfaite sur les propriétés mécaniques et minérales de l'os cortical chez l'enfant". Thesis, Ecully, Ecole centrale de Lyon, 2014. http://www.theses.fr/2014ECDL0042/document.
Pełny tekst źródłaOsteogenesis Imperfecta (OI) is a genetic disorder, also known as the “brittle bone disease”, associated with an increased bone fragility. Several phenotypes exist, reflecting different severities but some features are frequently observed like a reduced stature and long bone deformities. A few treatments are currently used but none of them is curative. To improve those treatments there is a need for a better understanding of the mechanisms involved. Therefore, the objective of this work is to investigate the effects of OI on the bone tissue at macroscopic and tissue scales. The main interest of this project is to perform a comparative study between a group of OI bones retrieved from children with OI and a group of control bones retrieved from healthy children. The mechanical, mineral and structural properties of those two groups were compared using high resolution computed tomography, nanoindentation, spectroscopy Raman, scanning electron microscopy, digital image correlation and compression testing. The osteoclast activity on those two types of substrates was compared by interferometry. Finally, the virtual fields method was applied to identify elastic moduli of interstitial and osteonal zones in bone tissue. The tissue quality, the remodeling activity and the microstructure were altered in OI, those modifications can explain the increased fragility of OI bones
Yacoub, Aiman. "Effet du traitement du sable recyclé sur les propriétés du mortier". Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1036.
Pełny tekst źródłaThe sustainability of primary resources is subjected to continuous threat via the construction industry. In fact, the amount of construction and demolition waste (CDW) produced and dumped into landfills is increasing each year. This situation forced the concrete industry to generate effective solutions such as implementing CDW as recycled concrete aggregates (RCA) to produce new types of concrete. Furthermore, a recent life cycle assessment study proved that the concrete made of RCA presents the best environmental behavior. CDW is currently used in the road and sidewalks construction and maintenance, however it needs more time and further investigations before using it completely as RCA in new concrete for building construction field because of their poor porosity properties. The recycling of the totality of the RCA in order to be used as new materials to produce new recycled concrete opens nowadays new environmental, economic and technological perspectives. Many scientific obstacles need to be studied in order to solve these perspectives. The re-use of the CDW as RCA will allow the limitation of the extraction of the raw materials and preserving the natural aggregates fields. In this thesis, we will be studying the fraction 1-4 mm of the RCA called recycled sand (RS). The water absorption of the RS influences the fresh and the hardened properties of mortar. Therefore, it is hard to maintain a constant W/C ratio since there is two phenomena during the fabrication of mortar: the absorption kinetic of the RS and the hydration reaction of the cement. In addition, the use of the RS leads to a decrease in the compressive strength and the durability properties of mortar. This decrease is controlled by three parameters: the porosity of the RS, the properties of the new cement paste and the properties of the interfacial transition zone (ITZ).The thesis proposed by the laboratory FM2D / MaST (IFSTTAR) is entitled ‘Effect of the treatment of the recycled sand on the properties of mortar’. This research subject is a comparison study between the behavior of treated recycled sand mortar and non-treated recycled sand mortar. In order to solve the problem of the use of recycled sand new mortar, we suggest two approaches:-Determining an optimal saturation state of the recycled sand in order to obtain a constant effectif W/C ratio.-Enhancing the microstructure of the RS using chemical products before using it in formulating new mortar. The treatment process proposed in this research consists of testing different chemical products with different concentrations using different application methods and different application times. The aim behind the chemical treatments proposed is, firstly, to decrease the value of the water absorption coefficient of the RS. The fresh and the hardened properties (compressive strength, durability properties, shrinkage) of mortar made with the treated RS (100% volume substitution) will be studied and compared to the properties of mortar made of non-treated RS and finally with the normalized mortar.The results obtained during this research indicate a success of the chemical treatment. The WAC of the RS decreased and the fresh and hardened properties of the mortar as well as it durability properties were enhanced compared to the mortar made of non-treated RS