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Ajouter le résultat dans votre panierThe filling behavior of reinforcing glass fiber in micro injection molding / G. L. Liou in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 4 (09/2010)
Titre : The filling behavior of reinforcing glass fiber in micro injection molding Type de document : texte imprimé Auteurs : G. L. Liou, Auteur ; W.-B. Young, Auteur Année de publication : 2010 Article en page(s) : p. 264-265 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres -- Moulage par micro-injection
Composites à fibres de verreIndex. décimale : 668.9 Polymères Résumé : Microinjection molding is one of the methods used to fabricate micro scale plastic components. Addition of reinforcement in the thermoplastic materials can enhance the mechanical properties of the molded components. Due to the small dimension in micro features, the filling of reinforcements into those features is more difficult than into the main body of the component. This study is to investigate the filling efficiency in micro features for different reinforcements. The filling efficiency in the micro feature is almost the same as that in the main body of the component for using the reinforcement in nano size. For milled glass fibers, which have a distribution of the particle size, higher fiber content has better filling efficiency in the micro features. On the other hand, the filling efficiency is not affected by the volume fraction for using short glass fibers. DOI : 10.3139/217.2356 En ligne : https://drive.google.com/file/d/1BU58s1nMEYrTuaY5boByyuTgbs6I2D4l/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9822
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 4 (09/2010) . - p. 264-265[article]Réservation
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Titre : Modeling and characterization of the relationship between cell size and mechanical behavior of microcellular PP/mica composites Type de document : texte imprimé Auteurs : W. Gong, Auteur ; J. C. Gao, Auteur ; M. Jiang, Auteur ; J. Yu, Auteur ; L. He, Auteur Année de publication : 2010 Article en page(s) : p. 270-274 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Composites -- Propriétés mécaniques
Mica
Mousses plastiques -- Propriétés mécaniques
PolypropylèneIndex. décimale : 668.9 Polymères Résumé : The microcellular foamed polypropylene (PP)/mica composites were prepared through chemical microcellular injection to investigate the relationship between the mechanical behavior and the cell size. The mechanical behavior model of the microcellular foams is built based on the elastic stress/strain field. The mechanical behavior of the microcellular composites coincides well with the theoretical model. Under loading the large and non uniform cells are in a state of plane strain, which leads to low tensile and impact strengths, whereas small and uniform cells are in a state of plane stress, which contributes to the transition from brittle to tough fracture behavior in the microcellular PP/mica composite. DOI : 10.3139/217.2339 En ligne : https://drive.google.com/file/d/1Kd32PgdddqcamxdgPUkmThuPcSsqVZBe/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9823
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 4 (09/2010) . - p. 270-274[article]Réservation
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Titre : Three-dimensional finite element solution of the flow in single and twin-screw extruders Type de document : texte imprimé Auteurs : F. Ilinca, Auteur ; J.-F. Hétu, Auteur Année de publication : 2010 Article en page(s) : p. 275-286 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement tridimensionnel
Eléments finis, Méthode des
Extrudeuse bi-vis
Imagerie tridimensionnelleIndex. décimale : 668.9 Polymères Résumé : This work is aimed at the numerical modeling of the flow inside single and twin-screw extruders. Numerical solutions are obtained using a recently developed immersed boundary finite element method capable of solving the flow in the presence of complex non-stationary solid boundaries. The method is first validated against the solution obtained on a body-conforming grid for a single screw extruder and then applied to a twin-screw mixer. The time dependent single screw problem can also be solved in a rotating reference frame for which a steady state solution can be obtained. This allows the evaluation of time integration errors of the moving immersed interface algorithm. For instance the flow is considered isothermal and the material behaves as a Generalized Newtonian fluid. Because the viscosity depends on the shear rate, solutions will be shown for various rotation velocities of the screw and compared with solutions obtained on body-conforming grids. The method is shown to give very accurate results and can be used for a more in-depth investigation of the material behavior in extruders. DOI : 10.3139/217.2351 En ligne : https://drive.google.com/file/d/1iWUIP-2Z-d0vIVBdf6d6wmacgaM4k19P/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9824
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 4 (09/2010) . - p. 275-286[article]Réservation
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Titre : Entry flow of polyethylene melts in tapered dies Type de document : texte imprimé Auteurs : M. Ansari, Auteur ; A. Alabbas, Auteur ; Savvas G. Hatzikiriakos, Auteur ; Evan Mitsoulis, Auteur Année de publication : 2010 Article en page(s) : p. 287-296 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement visqueux
Polyéthylène
Rhéologie
Simulation par ordinateur
ViscoélasticitéTags : 'Polyéthylènes fondus' 'Ecoulements capillaires' 'Pertes de surpression' 'Simulations numériques' Visco-élasticité 'Modèle K-BKZ Index. décimale : 668.9 Polymères Résumé : The excess pressure losses due to end effects (mainly entrance) in the capillary flow of several types of polyethylenes were studied both experimentally and numerically under slip and no-slip conditions. These losses were first measured as a function of the contraction angle ranging from 15° to 90°. It was found that the excess pressure loss attains a local minimum at a contraction angle of about 30° for all types of polyethylenes examined. This was found to be independent of the apparent shear rate. This minimum becomes more dominant under slip conditions that were imposed by adding a significant amount of fluoropolymer into the polymer. Numerical simulations using a multimode K-BKZ viscoelastic model have shown that the entrance pressure drops can be predicted fairly well for all cases either under slip or no-slip boundary conditions. The clear experimental minimum at about 30° can only slightly be seen in numerical simulations, and at this point its origin is unknown. Further simulations with a viscous (Cross) model have shown that they severely under-predict the entrance pressure by an order of magnitude for the more elastic melts. Thus, the viscoelastic spectrum together with the extensional viscosity play a significant role in predicting the pressure drop in contraction flows, as no viscous model could. The larger the average relaxation time and the extensional viscosity are, the higher the differences in the predictions between the K-KBZ and Cross models are. DOI : 10.3139/217.2360 En ligne : https://drive.google.com/file/d/13601Vu2Ol_Pr3EBCZjiZpO5y03Wizp_a/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9825
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 4 (09/2010) . - p. 287-296[article]Réservation
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Titre : Rheological and molecular investigations of polyethylene degradation in a batch mixer Type de document : texte imprimé Auteurs : E. Twite-Kabamba, Auteur ; D. Rodrigue, Auteur Année de publication : 2010 Article en page(s) : p. 297-303 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement élongationnel
Malaxeurs et mélangeurs
Matériaux -- Fatigue
Polyéthylène
Polyéthylène basse densité
Polymères -- Détérioration
RhéologieIndex. décimale : 668.9 Polymères Résumé : In this study, polyethylene degradation is related to its thermo-mechanical history from processing in a batch mixer. A focus is made on the rheological and molecular properties of the polyethylene subjected to different processing conditions by changing the temperature, the rotor speed and the time of process. The results indicate that while shear rheological properties changed slightly, the elongational properties were substantially modified, especially the maximum stress and the elongation at break. Due to the formation of macroradicals while processing, macromolecular changes were characterized in terms of molecular weight distribution and the results represent a balance between rates of chain scission and chain branching. It was found that the main parameter to characterize the degradation behaviour was the input power. DOI : 10.3139/217.2365 En ligne : https://drive.google.com/file/d/1aiT5bd8vlg2BA_q2lUoV2Iqkb51UYHcD/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9826
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 4 (09/2010) . - p. 297-303[article]Réservation
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Titre : RheoDSC analysis of hardening of semi-crystalline polymers during quiescent isothermal crystallization Type de document : texte imprimé Auteurs : V. Janssens, Auteur ; C. Block, Auteur ; G. Van Assche, Auteur ; B. Van Mele, Auteur ; Peter Van Puyvelde, Auteur Année de publication : 2010 Article en page(s) : p. 304-310 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique
Calorimétrie
Cristallisation
Polymères semi-cristallins
RhéologieIndex. décimale : 668.9 Polymères Résumé : The crystallization of semi-crystalline polymers is often analyzed by rheometry and calorimetry. By rheometry the viscosity evolution during crystallization can be followed, whereas from a calorimetric measurement, the evolution of the degree of crystallinity can be calculated. The time evolution of these material properties is valuable input for polymer processing simulation software and in order to combine the data in a reliable manner, hardening curves are used as a characterization tool. Such a hardening curve correlates the relative increase of the viscosity resulting from crystallization, to the advancing degree of crystallinity. In this study, these are extracted from simultaneous measurements on one sample using a RheoDSC device. The RheoDSC technique allows for the direct combination of the rheological and calorimetric signal without the need of combining separate stand-alone measurement results. In this study, isothermal crystallization experiments are used to discuss the benefits of this approach. This will lead to the recommendation that measuring the hardening effect in steady shear measurements at very low shear rates in a direct combined RheoDSC setup is the most reliable method to compile unambiguously a material specific hardening curve for semi-crystalline polymers. DOI : 10.3139/217.2374 En ligne : https://drive.google.com/file/d/1cnJN8rZnm6E-MZMtd51j4BzV5esbC1jN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9827
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Titre : Effect of process parameters on mechanical properties of rice husk polypropylene composites Type de document : texte imprimé Auteurs : V. Kumar, Auteur ; S. Sinha, Auteur ; M. S. Saini, Auteur ; B. K. Kanungo, Auteur Année de publication : 2010 Article en page(s) : p. 311-314 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à cosses de riz
Composites à fibres végétales -- Propriétés mécaniques
PolypropylèneIndex. décimale : 668.9 Polymères Résumé : Low density, easy of availability, less abrasive and biodegradable nature of lignocellulosic materials emphasized their usage for development of thermoplastic composites based on Rice Husk and Polypropylene (RHPP). Mechanical properties of RHPP composites such as tensile, impact strength decreases by the addition of rice husk, preheating of rice husk and its proper size is essential for its effective use as filler in polypropylene composites. Improvement in tensile, impact, hardness and abrasion resistance is possible by adding compatibiliser and reduction of cooling time. Impact strength of the composite increase with temperature, optimum temperature for obtaining good tensile, hardness and abrasion is 200°C. RHPP Composites thus prepared have potential for applications in building and automobile industries. DOI : 10.3139/217.2369 En ligne : https://drive.google.com/file/d/1hh65At1T3fMDkPAixSd3E11k8zK4MpPj/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9828
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 4 (09/2010) . - p. 311-314[article]Réservation
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| Code-barres | Cote | Support | Localisation | Section | Disponibilité |
|---|---|---|---|---|---|
| 012380 | - | Périodique | Bibliothèque principale | Documentaires | Disponible |
