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Auteur Tim A. Osswald |
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Ajouter le résultat dans votre panier Affiner la rechercheDescribing processing operations with models / Tim A. Osswald in KUNSTSTOFFE PLAST EUROPE, Vol. 93, N° 10/2003 (10/2003)
Titre : Describing processing operations with models Type de document : texte imprimé Auteurs : Tim A. Osswald, Auteur Année de publication : 2003 Article en page(s) : p. 41-43 Langues : Anglais (eng) Index. décimale : 668.4 Plastiques, vinyles Résumé : Simulation - Large numbers of eminent institutes world-wide are working on describing in mathematical terms the processes that take place in the individual plastics processing operations by means of models and simulations. This article provides an overview of the methods familiar to date. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=7072
in KUNSTSTOFFE PLAST EUROPE > Vol. 93, N° 10/2003 (10/2003) . - p. 41-43[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011079 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Discontinuous fiber-reinforced composites : Fundamentals and applications Type de document : texte imprimé Auteurs : Umesh N. Gandhi, Auteur ; Sebastian Goris, Auteur ; Tim A. Osswald, Auteur ; Yu-Yang Song, Auteur Editeur : Munchen [Germany] : Hanser Année de publication : 2020 Importance : XIV-465 p. Présentation : ill. Format : 25 cm ISBN/ISSN/EAN : 978-1-56990-694-1 Prix : 166 E Note générale : Index - Bibliogr. Langues : Américain (ame) Catégories : Composites à fibres discontinues Résumé : Discontinuous Fiber-Reinforced Composites is the product of years of collaborative work between industry and academia, presented in an easy-to-use, comprehensive manner. There are many books on composite material analysis, but most cover mainly continuous fiber materials, rather than those filled with discontinuous fibers, which are particularly attractive for large-volume and low-cost applications in a variety of industries. This book provides the theoretical and practical background to design and use discontinuous fiber-reinforced polymer materials, with an emphasis on structural parts for the automotive industry.
The information provided makes it possible for someone with an engineering background to understand the micromechanics of discontinuous fiber-reinforced materials and, hence, analyze the structural performance of components designed with such materials. The book employs a practical approach to cover the key, unique capabilities that are critical for a successful structural analysis of discontinuous fiber-reinforced polymer structures: process simulation to estimate the condition of fibers in the finished parts, capability to measure the microstructure of the composite, and estimation of material properties in the part based on fiber condition as well as environmental conditions such as temperature. A broad range of real-world examples is included, such as joining and hybrid composite materials, to provide the reader with an in-depth understanding of the fundamentally important process-structure-property relationship in discontinuous fiber-reinforced composites.Note de contenu : - 1. Introduction
- 2. Materials
- 3. Manufacturing processes
- 4. Microstructure in discontinuous fiber-reinforced composites
- 5. Mechanics of composites
- 6. Modeling and simulation of discontinuous fiber-reinforced composites
- 7. Process simulation for discontinuous fibers
- 8. Case studies to demonstrate application of multiscale modeling for fiber-reinforced polymers
- 9. Special topic : compression molding of discontinuous fiber material
- 10. Special topics in cae modeling of compositesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37534 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23380 668.4 DIS Monographie Bibliothèque principale Documentaires Disponible 
Titre : Effects of pressure and supercritical fluid on melt viscosity of LDPE in conventional and microcellular injection molding Type de document : texte imprimé Auteurs : C.-L. Hsu, Auteur ; Lih-Sheng Turng, Auteur ; Tim A. Osswald, Auteur ; N. Rudolph, Auteur ; E. Dougherty, Auteur ; P. Gorton, Auteur Année de publication : 2012 Article en page(s) : p. 18-24 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cisaillement (mécanique)
Etat fondu (matériaux)
Fluides supercritiques
Matières plastiques -- Moulage par injection microcellulaire
Polyéthylène basse densité
Rhéologie
ViscositéIndex. décimale : 668.9 Polymères Résumé : In this study, the flow and rheological behaviors of low density polyethylene (LDPE) and single-phase LDPE/N2 polymer/gas solutions at various gas contents were measured using a highpressure slit-die rheometer. The resulting rheology data of LDPE and LDPE/N2 were curve fit using the Cross –WLF model to obtain the seven material model constants, which were then used in the simulation of conventional and microcellular injection molding processes. The pressure effect on the shear viscosity of LDPE was also studied. The pressure dependency coefficient, D3, in the Cross –WLF model was determined by the use of simulation to best fit the experimental results. In addition, a three-dimensional plot of shear viscosity as a function of shear rate and pressure at various temperatures was constructed. Based on this three-dimensional viscosity – shear rate– temperature – pressure plot, the increase in viscosity due to the pressure effect was found to be more profound at high pressures, low temperatures, and low shear rates. Note de contenu : - PREVIOUS WORK
- EXPERIMENTAL : Slit-die rheometer - Geometric modeling for simulation - Material - Process conditions
- RESULTS AND DISCUSSION : Experimental data for neat LDPE - Temperature distribution from simulation - Viscosity pressure dependency coefficient - Experiments of LDPE/N2 solutionsDOI : 10.3139/217.2493 En ligne : https://drive.google.com/file/d/1ptY25lrbTScWYVnA8HNll5ohpIKmktDX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13717
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 1 (03/2012) . - p. 18-24[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13722 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Experimental and numerical study of rhomboidal mixing sections Type de document : texte imprimé Auteurs : A. C. Rios, Auteur ; P. J. Gramann, Auteur ; M. del P. Noriega, Auteur ; O. A. Estrada, Auteur ; Tim A. Osswald, Auteur Année de publication : 2000 Article en page(s) : p. 12-19 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Screw extrusion - The rhomboidal mixing section is becoming very popular among processors to provide distributive mixing. Currently, several different designs are used but the details of the flow behavior and mixing efficiency is not well understood. This information is needed to be able to design and find the most efficient rhomboid geometry. In this investigation nine different geometries with various pitches (helix of rhomboids) were analyzed using a 3-dimensional boundary element method (BEM). The geometries were compared according to mixing efficiency, pressure and energy consumption. The results were compared to experiments performed with a conventional single screw extruder that was fitted with three different rhomboidal mixing sections. The investigation led to the conclusion that the most effective distributive mixing sections were those with neutral rhomboids (pineapple mixer). However, the neutral rhomboidal mixing section consumes the most pressure in the extruder. It was also concluded that rhomboidal mixing sections deform the material by shear, making them poor dispersive mixing sections. Note de contenu : NUMERICAL ANALYSIS : Distributive mixing analysis - Dispersive mixing analysis - Characteristic curves
- EXPERIMENTAL ANALYSIS
- RESULTS AND DISCUSSION : Charasteristic curves - Residence time distribution - Mixing analysis - Temperature distributionDOI : 10.3139/217.1578 En ligne : https://drive.google.com/file/d/1XScEvt9TOx-k83ocRXY8pgi2oFJYXTyI/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16066
in INTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 1 (03/2000) . - p. 12-19[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001011 - Périodique Bibliothèque principale Documentaires Disponible
Titre : Influence of pressure on volume, temperature and crystallization of thermoplastics during polymer processing Type de document : texte imprimé Auteurs : N. M. Rudolph, Auteur ; Tim A. Osswald, Auteur ; Gottfried Wilhelm Ehrenstein, Auteur Année de publication : 2011 Article en page(s) : p. 239-248 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cristallisation
Thermoplastiques -- Moulage par injectionTags : 'Comportement volume/température' Pression Thermoplastiques 'Moulage injection' Moule Rétrécissement 'Stabilité dimensionnelle' Index. décimale : 668.4 Plastiques, vinyles Résumé : The main shrinkage and dimensional stability impact factors are processing temperature and pressure. For that reason, the pvT-behaviour is often used to estimate plastic part shrinkage. As there are still differences between predicted and actual part dimensions, a closer look was taken at these influencing factors. During processing, temperature changes occur due to heat conduction to the mold walls, and the pressure varies in the filling stage and holding time along the flow path. However, these pressure gradients are typically not taken into account in plastics processing. Hence, the influence of pressure was examined in detail and further investigations on pvT-behavior of polymers were performed. For that purpose, fundamental examinations of the behavior of amorphous thermoplastics during cooling and compression were made. These include analysis in the different phases and at different compression speeds as well as variation of the pressure-temperature-cycles and their succession. It was found that the specific volume is not defined by one value of p and T, but is dependent on the pathway of the process. That applies for both thermal expansion and compressibility. The adiabatic compression heating was also examined and a numeric solution was found to easily adapt the pvT-results on the base of compressibility measurements. These findings are discussed by means of the free volume theory. Additionally, a choice of these investigations was performed with semi-crystalline thermoplastics. It was found, that compression heating is even more important for these polymers because it can superpose crystallization heating at appropriate parameters. Furthermore, it can be seen that the density, morphology and lamellae thickness is influenced by pressure. In the outlook of this paper, the impact of these results on the injection molding process is discussed in detail. DOI : 10.3139/217.2417 En ligne : https://drive.google.com/file/d/1T2PBcVKE0DAN6yOLE16GbpGa8joFaFbv/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12402
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 3 (07/2011) . - p. 239-248[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013159 - Périodique Bibliothèque principale Documentaires Disponible PermalinkPermalink
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