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Статті в журналах з теми "Fatigue des mousses polymères"
Viot, Philippe, and Florent Beani. "Comportement de mousses polymères en compression dynamique." Revue des composites et des matériaux avancés 13, no. 3 (December 23, 2003): 283–92. http://dx.doi.org/10.3166/rcma.13.283-292.
Повний текст джерелаBen Lazreg, B., F. Chinesta, and A. Tcharkhtchi. "Modélisation de l'expansion d'une bulle dans le rotomoulage des mousses polymères par agent porogène chimique." Matériaux & Techniques 96, no. 6 (2008): 269–80. http://dx.doi.org/10.1051/mattech:2008048.
Повний текст джерелаAMIROU, Siham. "Polymères dendrimères et hyperbranchés - Additifs pour colles à bois et mousses." Bois et papiers, January 2022. http://dx.doi.org/10.51257/a-v1-re292.
Повний текст джерелаArtous, Mathieu, René Guénon, Olivier Lemmel, Hervé Buord, Laure Vidal Beaudet, and Patrice Cannavo. "CONSTRUCTION OF FERTILE GROWING MEDIA FROM RECYCLED POLYURETHANE FOAM." Environnement, Ingénierie & Développement Unlabeled volume (March 1, 2022). http://dx.doi.org/10.46298/eid.2022.8505.
Повний текст джерелаДисертації з теми "Fatigue des mousses polymères"
Le, Bail Jean-Baptiste. "Modélisation du comportement mécanique sous chargement d’une butée d’amortisseur en mousse de polyuréthane : vers une démarche de dimensionnement en fatigue." Electronic Thesis or Diss., Brest, École nationale supérieure de techniques avancées Bretagne, 2022. http://www.theses.fr/2022ENTA0003.
Повний текст джерелаPolyurethane foam jounce bumpers are widely used in the automotive industry. Their main function is to absorb vertical shocks to the wheels and contribute to the integrity of the vehicle suspension. The mechanical response of this type of parts implies to take into account different mechanisms, from the buckling of the walls of the part to the self-contact through the geometrical non-linearities. The current characterization of these polyurethane foam jounce bumpers in fatigue is currently limited to the customer’s specifications and to the tests predefined by him. The objective of this thesis is to carry out a complete experimental characterization of the mechanical behavior in order to identify an Hyperfoam type behavior law. This characterization is also based on imaging techniques, SEM and tomographic, in order to characterize the link between the microstructure and the mechanical behavior of the jounce bumper. This study should allow to define a global approach for the fatigue design of polyurethane foam jounce bumper
Chen, Xiao Yuan. "Mousses structurales asymétriques de polymères." Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25085/25085.pdf.
Повний текст джерелаMechraoui, Ahmed. "Sandwich composite de mousses polymères." Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27452/27452.pdf.
Повний текст джерелаThe aim of this work is to produce and characterize polypropylene structural composite foams. To do so, the work is divided in three parts. The first part is devoted to study the reinforcement of polypropylene with hemp fibres by changing the fibre content, fibre size and coupling agent concentration. Micrographs are used to explain the results of the mechanical properties measured under tensile and flexural stress. It is found that 2% of coupling agent gives the optimum modulus values. In the second part, polypropylene foams are produced by compression moulding with different concentrations of blowing agent to determine the effect of density reduction and density profile on the tensile and flexural properties. The morphological characteristics (cell size, cell density and skin thickness) of the foams are also examined. It is found that the use of the complete density profile is necessary to predict with high precision the mechanical results. Finally, sandwich structures are produced with different skin ratio and core densities. A complete morphological analysis is reported with mechanical properties (tensile and flexural). It is shown that the simple law of mixture and the square power-law combined with the density profile are enough to predict the effect of the skins and core, respectively.
Guillermic, Reine-Marie. "Propriétés physico-chimiques des mousses : études approfondies sur des mousses modèles et études exploratoires sur de nouvelles mousses." Phd thesis, Université Rennes 1, 2011. http://tel.archives-ouvertes.fr/tel-00573721.
Повний текст джерелаDeverge, Mickaël. "Propriétés mécaniques et rhéologiques des mousses de polymères réticulés." Le Mans, 2006. http://cyberdoc.univ-lemans.fr/theses/2006/2006LEMA1008.pdf.
Повний текст джерелаThe use of cross-linked polymer foams gains ground more and more, particularly for acoustic absorption. This work present new approaches for the characterization of these materials, which have a behavior in hysteresis with 3 distinct zones. First the linear behavior is presented on a large frequency band with the application of the Time-temperature Superposition (TTS) principle. 2 aspects are thus shown: a weak portion of the skeleton takes part in the stress transmission, and the elastic modulus at null frequency decrease with the pore size. Then an extension of the magnetism Preisach's theory is presented for great deformations: hysteresis is thus modelled starting from a distribution of microscopic hysterons. Lastly, 2 compressive relaxation mechanisms are distinguished. Principal relaxation decreases stress by topological rearrangement of the foam beams
Deverge, Mickael. "Propriétés mécaniques et rhéologiques des mousses de polymères réticulés." Phd thesis, Université du Maine, 2006. http://tel.archives-ouvertes.fr/tel-00133963.
Повний текст джерелаDiverses méthodes ont été développées afin de caractériser ces matériaux, en particulier leur domaine linéaire, zone privilégiée pour l'absorption acoustique et la détermination des paramètres mécaniques courants. Cependant ces caractérisations restent souvent limitées à une faible plage fréquentielle. Une première étude présente ici le comportement linéaire sur une large gamme de fréquences grâce à l'application du principe de Superposition Temps-Température (TTS). L'utilisation du TTS sur une famille de mousses obtenues avec le même polymère, de même densité, mais dont la taille des pores est différente, met en évidence deux aspects importants: seulement 3 % du squelette solide participe à la transmission de la contrainte, et le module élastique à fréquence nulle décroît avec la taille des pores.
Les mousses de polymères sont certes souvent utilisées dans leur domaine linéaire, mais leur comportement mécanique diffère à de plus forts niveaux de déformation. Les courbes en contrainte-déformation présentent un comportement en hystérésis, avec trois zones de comportement distinctes (linéaire, flambement et densification). Il existe d'autres phénomènes en hystérésis qui ont été plus simplement modélisés, par exemple à l'aide de la théorie de Preisach-Krasnoselskii-Mayergoyz (PKM) issue du magnétisme. Une seconde partie de ce travail présente une nouvelle extension de cette théorie PKM aux mousses de polymères réticulés à cellules ouvertes, soumises à de grandes déformations: nous pouvons ainsi modéliser l'hystérésis observée expérimentalement, à partir d'une distribution d'hysterons microscopiques contenus dans un espace de Preisach-Mayergoyz.
Dans une troisième partie, l'influence de l'histoire passée des contraintes sur la mesure des paramètres mécaniques d'une mousse est étudiée, et plus particulièrement la rhéologie de ces mousses dans le cadre de la relaxation de compression, en distinguant deux mécanismes, l'un en zone linéaire de chargement et l'autre en dehors. Liée à l'histoire des contraintes passées, ce second mécanisme de relaxation permet la réduction des contraintes par réarrangement topologique des poutres de la mousse.
Mazzon, Elena. "Développement, étude physico-chimique et optimisation de mousses polymères biosourcées." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT197.
Повний текст джерелаThis thesis focuses on the development of a new generation of bio-based polymer foams able to produce low density core in sandwich structure for automotive applications. The polymer formulations used in this research contain two different epoxy compounds, epoxidized linseed oil (ELO) and the epoxidized glycerol (GE). Combined in varying proportions, they were cured with two different hardeners, isophorone diamine (IPDA) or methyl tetrahydrophthalic anhydride (MTHPA). Ternary formulations “ELO – GE – hardener” were characterized by a multi-techniques approach (DSC, TGA, rheometry in steady or dynamic mode) in order to establish structure-property relationships. The production of polymeric-foam materials was carried out by tuning a chemical reaction which takes place during curing. Sodium bicarbonate and potassium bicarbonate were used as harmless foaming agents. In order to improve the final performances of the foams, the ratio GE/ELO was increased in the reactive formulations based on IPDA hardener. But, such modification provokes also the thermal degradation of the system because of the high exothermicity of the curing reaction. The introduction of “exothermicity regulators” that undergo endothermic transformations allowed to control the excess of released heat and consequently, to prevent the material degradation. A last class of hardener was also studied and made it possible after optimization the production of foams with good ultimate properties. To conclude, a large range of biobased and lightweight rigid foams able to be produced in a few minutes was developed
Gropplero, di Troppenburg Giacomo. "Dispositifs microfluidiques dans les mousses polymères : fabrication, modélisation et applications biologiques." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI060.
Повний текст джерелаMicrofluidics and an appropriate substrate are essentials for the design of low-cost point-of-care diagnostic devices. The particular mechanical and structural properties (porosity, elasticitydots) of polymeric foam are unique among the other widespread materials in microfluidics (PDMS, paper, plastic materials, glass, silicondots). A systematic screening of the different capabilities provided by polymeric foam as a new substrate for microfluidics is offered in this thesis. First off, a shaping process is proposed for the production of fluidic microsystems. This new process relies on the combined usage of a polymeric foam and an elastomer to produce highly elastic fluidic systems that keep the initial structural properties of the foam. Based on a controlled and repeatable embossing technic, the process is compatible with industrial production. A coupled numerical model also allows its optimization. The resulting foam microfluidic devices have, besides capillarity, a decisive asset : the option of a manual compression or an external peristaltic actuation for a contamination-free control of the microfluidic flows. The peristaltic actuation can function as a pump and as a valve. A lumped elements model enables a dynamic reproduction of the fluidic behavior inside the foam channels. To ensure proper integration in low-cost portable devices, the fundamental stages of a diagnostic test (retrieval and preparation of a sample, detection) are validated. We show that filtration of objects of only a few tens of micrometers in size is possible. The foam devices can also be chemically functionalized to optimise the capture of specific biological targets. The fluorescent or colorimetric detection of biological elements is equally possible by means of isothermal DNA amplification. Finally, a blood typing prototype gives access to the blood group of a whole blood sample in a few minutes. This last test is carried on an integrated device which highlights the main benefits of a foam device : robustness, user-friendly, embedded reagents, multiple materials combination, transport of a biological sample by external compression controlled by an operator, direct readout of a result in a few minutes
Pradel, Pierre. "Etude de la compaction dynamique de mousses polymères : Expériences et modélisation." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2017. http://www.theses.fr/2017ESMA0035/document.
Повний текст джерелаPolymeric foams are widely used in many industrial applications as thermal insulators, structural materials or shock mitigators. Indeed, they are light weight materials with an excellent weight /stiffness ratio and low production costs. One of the applications which interests the CEA is the protection of structures against mechanical loadings generated by laser irradiation or high velocity impact of small debris.The main objective of this PhD thesis is to investigate the mitigation capability of an expanded polyurethane foam and an epoxy syntactic foam against extremely fast (> 106 s−1) and intense(> 10 GPa) dynamic loadings. Cyclic quasi-static tests and dynamic experiments have been performed to investigate the behavior of these two foams for strain rates ranging from 10−3 to 106 s−1. Analysis of the experimental results shows that these polymeric foams have an elastic behavior phase followed by a compaction phase with significant permanent sets. Compaction thresholds are about 9 MPa for the polyurethane foam and 30 MPa for the epoxy foam under quasi-static loadings and around 21 MPa for the polyurethane foam and 72 MPa for the epoxy foam for strain rates above 104 s−1.Two porous compaction models are developed to represent the macroscopic behavior of these foams for such strain rates. The parameters are identified from the results of dynamic compression experiments (gas gun, low inductance generator). The validity of the models is tested by comparing calculated velocity profiles with an explicit hydrocode and velocity profiles measured during the experiments. These models are then used to analyze the results obtained with electron beam irradiation and laser-driven shock experiments. We demonstrate that the studied polymeric foam shave high mitigation capabilities and that the models are valid for high strain rates
Larochette, Mathieu. "Mousses de polymères : étude des procédés de synthèse et de mise en forme." Pau, 2007. http://www.theses.fr/2007PAUU3016.
Повний текст джерелаPolymer foams are used for many applications thanks to their properties: lightness, insulation, impact resistance. . . In this work, we studied the elaboration of two kind of materials: polyurethane foam and extruded polystyrene foam. In the case of polyurethane, the correlation between the kinetic of polymerization and the foaming is important. For the polystyrene, we shown that the residence time distribution theory modelize properly the extrusion process. We found a relationship between the structural anisotropy and the thermal anisotropy coupling an experimental and a numerical approaches. The morphological anisotropy observed on industrial foam does not permit to observe the anisotropy of temperature field
Книги з теми "Fatigue des mousses polymères"
A, Kardomateas George, ed. An introduction to fatigue in metals and composites. London: Chapman & Hall, 1996.
Знайти повний текст джерела1924-, Cahn R. W., Haasen P, and Kramer E. J, eds. Materials science and technology: A comprehensive treatment. Weinheim: VCH, 1991.
Знайти повний текст джерелаGuedes, Rui Miranda. Creep and Fatigue in Polymer Matrix Composites. Elsevier Science & Technology, 2016.
Знайти повний текст джерелаGuedes, Rui Miranda. Creep and Fatigue in Polymer Matrix Composites. Elsevier Science & Technology, 2019.
Знайти повний текст джерелаCreep and Fatigue in Polymer Matrix Composites. Woodhead Publishing, 2019.
Знайти повний текст джерелаEdwards, Dale, Michael Hayes, and Andy Shah. Fractography in Failure Analysis of Polymers. Elsevier Science & Technology Books, 2015.
Знайти повний текст джерелаFractography in Failure Analysis of Polymers. Elsevier Science & Technology Books, 2015.
Знайти повний текст джерелаEdwards, Dale, Michael Hayes, and Andy Shah. Fractography in Failure Analysis of Polymers. Elsevier Science & Technology Books, 2024.
Знайти повний текст джерелаCarlson, R. L., and G. A. Kardomateas. Introduction to Fatigue in Metals and Composites. Springer, 1995.
Знайти повний текст джерела(Editor), R. W. Cahn, Peter Haasen (Editor), and E. J. Kramer (Editor), eds. Materials Science and Technology: A Comprehensive Treatment (Materials Science & Technology). Wiley-VCH Verlag GmbH, 1990.
Знайти повний текст джерелаЧастини книг з теми "Fatigue des mousses polymères"
Ranisch, E. H., and F. S. Rostasy. "Bonded Steel Plates for the Reduction of Fatigue Stresses of Coupled Tendons in Multispan Bridges." In Adhesion between polymers and concrete / Adhésion entre polymères et béton, 561–70. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3454-3_56.
Повний текст джерелаHoltgreve, K. "A Contribution in Regard to Behaviour of Reinforced Tee-Beams with Bonded Flatsteel Components under Fatigue Loads." In Adhesion between polymers and concrete / Adhésion entre polymères et béton, 528–33. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3454-3_52.
Повний текст джерела