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Academic literature on the topic 'Matières plastiques – Matériaux – Fatigue'
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Dissertations / Theses on the topic "Matières plastiques – Matériaux – Fatigue"
Khawar, Farooq Muhammad. "Comportement mécanique des composites sandwichs en statique et fatigue cyclique." Le Mans, 2003. http://cyberdoc.univ-lemans.fr/theses/2003/2003LEMA1006.pdf.
Full textThe aim of the this study is to investigate the mechanical behaviour of sandwich composite materials under static and fatigue. Initially, static and fatigue testing of cores in compression, indentation, shear and three-point bending tests and skins in flexural tests are conducted to derive the mechanical behaviour and the characteristics for the constituants of the sandwich composites. Detailed investigations have been carried out to study the performance of sandwich specimens of different core thickness and densities at various span lengths in static flexural tests. Phenomena of pure bending and shear are characterised at different span lengths and compared to the results obtained by the sandwich beam theory. Damage initiation, progression, coalescence and failure are observed in sandwich specimens during fatigue testing and correlated with stiffness degradation. Mechanical behaviour of sandwich composites is highly affected by the core thickness and the density of the foams and depends on the type of loading, the frequency, as well as the applied loading levels and ratios. Fatigue life is characterised by Wohler curves using N10 criterion for different types of sandwich composites. Finally, analytical models are developed on the basis of a stiffness degradation approach to predict the fatigue life and damage development in sandwich composite materials. A good agreement is found between experimental and analytical results
Pires, Isabelle. "Vieillissement dans l'antigel de matériaux composites polyamide-6,6 renforcé par des fibres de verre courtes." Montpellier 2, 2000. http://www.theses.fr/2000MON20124.
Full textSeignobos, Elodie. "Compréhension des mécanismes physiques de fatigue dans le polyamide vierge et renforcé de fibres de verre." Lyon, INSA, 2009. http://www.theses.fr/2009ISAL0090.
Full textGlass fiber reinforced polyamides are used in the automotive field thanks to their ligth weight in comparison to metals for the same rigidity. In order to study its durability, this material was tested in fatigue at different temperatures and stress vs fatigue lifetime curves (also called Wöhler curves) were drawn. We proposed a damage criterion based on the strain and therefore we normalized the Wöhler curves by the initial elastic modulus at the functionning temperature of the material. The master curve obtained enabled to predict the fatigue lifetime for a wide range of stresses and temperatures. Our study show that fatigue damage evolves in 3 phases. During the first step the material’s temperature increases and the damage is negligible. The second step is characterized by a stable temperature and a linear evolution of the apparent stiffness (called dynamic modulus in fatigue) and of the strain with the logarithm of the number of cycles. The sharp drop of stiffness during the third step is followed by the breaking of the composite. We show that lifetime is controlled by the duration of the second phase where t the material’s modulus decreases linearly with the logarithm of the time. Characterizations by X ray scattering, neutron scattering and electronic microscopy enabled us to study the fatigue damage from the nanometric scale to the micronic scale of the semi-crystalline structure of the reinforced polyamide and of the neat polyamide as a reference. The damage during the second step can be explained. We show that the drop of properties is due to low density domains nucleation in polymeric matrix at the nanometric scale, and to the increase of the number and of the size of these domains until the micronic scale. The size distribution, density and form factor of the domains have been quantified. We proposed a physical model for the nucleation of the domains based on the concept of heterogeneities of local strains. The activation energy has been estimated. This model is able to account for the logarithmic evolution of the macroscopic properties of reinforced and neat polyamide in fatigue. The results of this thesis opens the way to a better lifetime prediction in fatigue in one hand, and to an increase of the lifetime thanks to innovative formulations of polymer matrix in another hand
Chateauminois, Antoine. "Comportement viscoélastique et tenue en fatigue statique de composites verre-époxy : influence du vieillissement hygrothermique." Lyon 1, 1991. http://www.theses.fr/1991LYO10242.
Full textLeguebe, Elora. "Optimisation de la stabilité de charge au cours d'un transport à partir de l'étude du comportement viscoélastique des matériaux polymères destinés au banderolage." Electronic Thesis or Diss., Reims, 2023. http://www.theses.fr/2023REIMS044.
Full textNowadays, protecting products during transportation has become essential as import-export increased drastically. Therefore, the wrapping used to stabilize and protect pallets of goods is fundamental. The most commonly used material for wrapping films is linear low density polyethylene (LLDPE). However, ecology has become a major issue for the world. The eco-design of the film is desired for a lower mass of plastic on the pallet, while preserving the stability of the load. Therefore this thesis work concerns the optimization of load stability according to the properties of the wrapping materials and the mechanical stresses of transport in order to reduce the weight of plastic used. Manual and mechanical films were analyzed. The anisotropy of materials was studied. The characterization of the material was performed through mechanical tests (traction, relaxation, hysteresis and fatigue creep) and morphological tests with DSC, IR and XRD analysis. The characterization of the wrapping and the importance of its parameters were also investigated. The effect of wrapping speed, LLDPE fatigue and acceleration experienced during transport were found to affect significantly the film properties. Films morphology was found to be affected by the wrapping process, showing changes in crystallinity. The study showed the importance of wrapping parameters and transport constraints on the morphology of the stretch film on the pallet and therefore on the stability of the load
Gauthier, Catherine. "Composites unidirectionnels PET-Verre : relations morphologie, mise en œuvre, propriétés mécaniques." Lyon 1, 1992. http://www.theses.fr/1992LYO10046.
Full textKlimkeit, Bert. "Etude expérimentale et modélisation du comportement en fatigue multiaxiale d'un polymère renforcé pour application automobile." Phd thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aéronautique, 2009. http://tel.archives-ouvertes.fr/tel-00464186.
Full textBourgogne, Quentin. "Contribution à l’étude du comportement mécanique d’un PPS/GF40 sous différents chargements avec prise en compte des effets de l’environnement de sollicitation : étude expérimentale et modélisation multi-échelle pour application au développement de pièces automobiles." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0181.
Full textThis thesis presents an experimental and theoretical study conducted on a PPS/GF40 and its matrix. Widely used for under-the-hood applications in the automotive industry, those materials are subjected to high temperatures and aging effects of cooling liquid. Therefore, the understanding of those phenomena is essential to design mechanical parts. Thus, an experimental campaign in the tensile mode has been carried out with different temperatures and glycol proportions in the cooling liquid, for monotonic and cyclic loadings on neat and reinforced PPS. The results of these tests allowed us to highlight some of the main physical phenomena occurring during these solicitations under tough hydro-thermal conditions. Taking into account this analysis, a visco-elasto-pseudo-viscoplastic model is proposed. Moreover, this model allows the consideration of the cooling liquid effects and its constituents by temperature/humidity equivalence. The accuracy of the model was confronted to an artificial intelligence based one, in order to study the maximal accuracy physically reachable. Finally, the evolution of the model parameters has been studied with the adjunction of short glass fibres and for specifics orientation distribution. Starting from the study of the mechanical behavior of the PPS matrix, an analytical homogenization was then performed. Differences between experimental and predicted plastic behaviors were highlighted. Finite element analyses considering inter-phase damage were done at different temperatures and for several fiber orientations so to explain differences arising between analytical approach and experimental results. This work allowed a study of the evolution of the impact of this damage on mechanical properties as a function of temperature and fiber orientation. This work led to highlight a weakening of the fiber/matrix interface for a liquid aged composite and to quantify the decrease of the interface properties. Finally, fatigue behavior of the composite is studied as a function of fiber orientation. The modeling parameters determined from the study of the monotonic behavior of the composite were taken into account to propose a prediction of the Wöhler curves as a function of temperature. The prediction of the Wöhler curves as a function of temperature being possible, a 1D model was then proposed in order to evaluate the increase of temperature due to self-heating phenomenon during fatigue loading, considering ageing consequences
Goutal, Caroline. "Dimensionnement en fatigue en présence de singularités macroscopiques dans un thermoplastique renforcé fibres de verre courtes (PA66GF50) sous chargements uni- et multi-axiaux." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2020. http://www.theses.fr/2020ESMA0008.
Full textIn the current environmental context, the automotive industry looks for reducing CO2 emissions while keeping vehicles power. To this aim, a solution is to lighten the vehicles. In this context, this Ph.D. thesis, supported by Solvay Engineering Plastics in collaboration with Vibracoustic, deals with fatigue resistance of injected parts in Polyamide 6.6reinforced by 50% wt. of short glass fibers, and attempts to take into account the effects of multiaxial loadings and geometrical singularities into a fatigue design methodology. The study is conducted for a given conditioning(RH50%,T80°C) representative of the atmospheric conditions experienced by motor mounts. A fully integrated numerical approach from injection simulation to lifetime prediction by a fatigue criterion, named Through Process Modelling (TPM), is used. One TPM specificity lies in the calculation of the local mechanical response at each point of the part from a multi-scale approach considering the matrix viscoelasticity and the fibers orientation due to the injection process. The fatigue criterion selected is a dissipated energy one. It is based on a “Fatigue Indicator Parameter” (FIP) assimilated to the stress-strain loop area in the stationary regime and obtained by post-treatment of mechanical fields at each point of the part.First, the matrix constitutive law is identified by reverse engineering. Then, the question of the discretization to be adopted in the thickness of an injected part is addressed on smooth samples, and the identification strategy of the fatigue criterion is defined. Subsequently, TPM is applied to a large fatigue database, specifically built for the study, and involving samples and loadings with increasing complexity. Uniaxial tension loadings are studied, firstly on smooth samples (with different fibers orientations), then on pipes, and finally on notched samples. Shear loadings on butterfly samples and torsion loadings on pipes are studied. At last, pipes under combined tension-torsion are considered. For each loading and each singularity level, attention is paid to the definition of a volume around the singularity onwhich the FIP should be spatially averaged. The definition relies on the mechanical gradients analysis. The TPM provides thus lifetimes predictions close to experimental ones in most of the studied configurations
Fouchier, Nathan. "Approche intégrée pour estimer la durée de vie en fatigue de pièces thermoplastiques renforcés fibres courtes dans un cadre viscoélastique haute température." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2018. http://www.theses.fr/2018ESMA0017/document.
Full textThe employment of short glass fibres reinforced thermoplastics is increasing in the automotive industry for hot environment applications. The design of components in such conditions and with this type of materials under fatigue loading must be optimized using a fatigue life assessment methodology. The heterogeneous fibres orientation distribution (FOD), due to the injection process should be considered.This work, funded by the Direction Générale de l’Armement et Région Poitou-Charentes, suggests an integrated approach from the injection process simulation to the assessment of the fatigue life at 110°C of injected components in a viscoelastic framework.The methodology here advanced is called “Through Process Modelling” (TPM). From the FOD in the component given by the injection simulation, the anisotropic effective local properties are estimated using viscoelastic homogenisation. The heterogeneous mechanical fields obtained by finite element simulations, for different types/levels of loading, are post-processed in order to get the input equivalent mechanical quantity of an energetic fatigue criterion giving the fatigue life of the component in each of these loading conditions.The identification of the fatigue criterion parameters and the validation of the whole methodology rely on an experimental fatigue database for a PA66GF30. Uniaxial tensile fatigue tests are carried out at 110°C in a climatic chamber, for 2 stress ratios (R = 0,1 and R = -1) and at 2Hz. They are performed for specimens cut out from injected plates with different orientations with respect to the flow direction.The methodology leads to very good predictions. The influence of the prediction of the FOD, input of the calculation chain, on the results is discussed
Books on the topic "Matières plastiques – Matériaux – Fatigue"
Saechtling, Hansjürgen. International plastics handbook: For the technologist, engineer, and user. 2nd ed. New York: Macmillan, 1987.
Find full textWilbrand, Woebcken, Haim John, and Hyatt David, eds. International plastics handbook: For the technologist, engineer, and user. 3rd ed. Munich: Hanser, 1995.
Find full textOptical materials: An introduction to selection and application. New York: Dekker, 1985.
Find full textNatural fibre reinforced polymer composites: From macro to nanoscale. Paris: Éd. des Archives Contemporaines, 2009.
Find full textDesign for FRP composite connections. Reston, VA: American Society of Civil Engineers, 2002.
Find full textFailure of Fiber-Reinforced Polymer Composites. Taylor & Francis Group, 2021.
Find full textThariq, Mohamed, K. Jayakrishna, and M. Rajesh. Failure of Fiber-Reinforced Polymer Composites. Taylor & Francis Group, 2021.
Find full textSultan, Mohamed Thariq Hameed, K. Jayakrishna, and M. Rajesh. Failure of Fiber-Reinforced Polymer Composites. Taylor & Francis Group, 2021.
Find full textReinforced Plastics Durability. CRC, 1999.
Find full textSaechtling, H., and W. Woebken. International Plastics Handbook. 3rd ed. Hanser Publishers, 1995.
Find full textBook chapters on the topic "Matières plastiques – Matériaux – Fatigue"
Verney, Vincent, and Vincent Verney. "4. Matériaux polymères et environnement." In Matières plastiques, 123–37. Dunod, 2017. http://dx.doi.org/10.3917/dunod.carre.2017.02.0123.
Full textReports on the topic "Matières plastiques – Matériaux – Fatigue"
Melanie, Haupt, and Hellweg Stefanie. Synthèse du projet conjoint du PNR 70 «Gestion des déchets pour soutenir la transition énergétique (wastEturn)». Swiss National Science Foundation (SNSF), January 2020. http://dx.doi.org/10.46446/publication_pnr70_pnr71.2020.2.fr.
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