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Auteur Jean-François Agassant
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Mines-Paritech, Centre de Mise en forme des matériaux - UMR CNRS 7635 Sophia-Antipolis - France
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Injection molding of fibre reinforced thermoplastics : Integration of fibre orientation and mechanical properties computations / H. Miled in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 5 (11/2012)
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Titre : Injection molding of fibre reinforced thermoplastics : Integration of fibre orientation and mechanical properties computations Type de document : texte imprimé Auteurs : H. Miled, Auteur ; L. Silva, Auteur ; T. Coupez, Auteur ; Jean-François Agassant, Auteur Année de publication : 2012 Article en page(s) : p. 547-556 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anisotropie
Composites à fibres -- Moulage par injection
Composites à fibres -- Propriétés mécaniques
Composites à fibres courtes
Composites thermoplastiques -- Moulage par injection
Distribution et orientation des fibresIndex. décimale : 668.4 Plastiques, vinyles Résumé : Injection molding is widely used to process short fibre reinforced thermoplastics. The quality and especially the mechanical properties of the resulting part are linked to the mold conception (for example the gate(s) and the venting port(s) locations) and to the processing parameters which will govern fibre orientation distribution. Fibre orientation modelling is based on the well known Folgar and Tucker equation. The models differ one from another by the interaction parameter, the closure approximation and by the coupling with the rheology of the reinforced melt. Quantitative comparison with experiments is very tedious and generally limited to simple part geometries (plaque or disk). As a consequence, in complex geometries, fibre orientation distribution is experimentally checked using several techniques and the resulting anisotropic thermo-mechanical properties are computed using various homogenization theories. In this paper, we propose a first integrated approach of the injection molding of fibre reinforced thermoplastics starting from rheology of the material, orientation equation, interaction parameter and closure approximation. The resulting local fibre orientation distribution is then used in two ways in order to predict the mechanical properties of the part: first, using classical analytical homogenization theories, but based on the computed orientation tensor and not on an experimental one, and then, using numerical homogenization which consists in generating a Representative Elementary Volume (REV), determining its unidirectional mechanical properties and finally, in computing directly the anisotropic properties of the part. Note de contenu : - Fibre orientation calculation
- Thermo-elastic anisotropic computation
- Direct numerical simulation
- Application to a plaque with complex gate geometryDOI : 10.3139/217.2602 En ligne : https://drive.google.com/file/d/1KDx14h4RnDYOWi6dz98Ptp8ndCgdRwlK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16632
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 5 (11/2012) . - p. 547-556[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14335 - Périodique Bibliothèque principale Documentaires Disponible Investigation of bubble instabilities in film blowing process / J. Laffargue in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)
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Titre : Investigation of bubble instabilities in film blowing process Type de document : texte imprimé Auteurs : J. Laffargue, Auteur ; L. Parent, Auteur ; P. G. Lafleur, Auteur ; P. J. Carreau, Auteur ; Y. Demay, Auteur ; Jean-François Agassant, Auteur Année de publication : 2002 Article en page(s) : p. 347-353 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This paper describes an original on-line video device developed in order to study bubble instabilities occurring in the film blowing process, taking into account their three-dimensional behavior. For a linear low-density polyethylene, two forms of instabilities and combination have been observed : draw resonance and helical instability. These instabilities could be quantitatively described and differences in behavior could be assessed using real objective measurements and criteria. The influence of key processing conditions was investigated and the results showed that the instabilities are enhanced by increasing the draw ratio, blow up ratio and frost line height. These first results are in agreement with the majority of the results reported in the literature, but allow for a more accurate analysis of the phenomena. Note de contenu : - EXPERIMENTAL : The film blowing unit - On-line measurements
- TYPICAL EXAMPLES : Stable bubble - Draw resonance instability - Helical instabilities
- PRIMARY RESULTS : Objectives - Low FLH - High FLH - Construction of bubble stability mapDOI : 10.3139/217.1704 En ligne : https://drive.google.com/file/d/1eUnHlunNemzsRduWllrIyGWzJa2MxID9/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16038
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Code-barres Cote Support Localisation Section Disponibilité 001022 - Périodique Bibliothèque principale Documentaires Disponible Investigation of Polymer Stretching Instabilities : Application to Film Blowing / J. Laffargue in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 5 (11/2010)
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Titre : Investigation of Polymer Stretching Instabilities : Application to Film Blowing Type de document : texte imprimé Auteurs : J. Laffargue, Auteur ; Y. Demay, Auteur ; Jean-François Agassant, Auteur Année de publication : 2010 Article en page(s) : p 356-371 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Soufflage -- Défauts Tags : 'Matière plastique' 'Défaut de soufflage' 'Instabilité hélicoïdale' Etirement Elongation 'Théorie la coquille' Homogénéisation Index. décimale : 668.9 Polymères Résumé : Film blowing, as other elongational polymer forming processes, may present marked drawing instabilities leading to unacceptable products. But in film blowing, these instabilities are much more complex than for example in fibre spinning: there is no stabilizing effect of the polymer cooling, and the symmetry of the process may be broken, leading in some processing conditions to so called helical instabilities. Stability of the process has been investigated using a strategy inspired from shell or homogeneisation theory: as the classical approach uses a frame locally affixed to the membrane, the equations of the problem are now written in the cartesian laboratory frame. Making the equations dimensionless introduces naturally a small parameter defined as an aspect ratio (ratio of the film thickness to the bubble radius). Kinematic and stress variables are expanded as a function of this small parameter and introduced in the equations. It leads classically to a sequence of equations at successive orders. This strategy is used to obtain a time dependent membrane model. The stationary solution is equivalent to the one obtained using the classical approach. This model allows to develop a stability analysis, first in the axisymmetric case and then in the non axisymmetric one. Even a crude Newtonian temperature dependent rheology allows to capture qualitatively the observed instability phenomena. DOI : 10.3139/217.2347 En ligne : https://drive.google.com/file/d/19Dl90VAwpAYDwpH-gwjcrZckf1K2Hl_P/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10254
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Code-barres Cote Support Localisation Section Disponibilité 012592 - Périodique Bibliothèque principale Documentaires Disponible Investigation of the interfacial instabilities in the coextrusion flow of PE and PS / Rudy Valette in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 2 (06/2003)
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Titre : Investigation of the interfacial instabilities in the coextrusion flow of PE and PS Type de document : texte imprimé Auteurs : Rudy Valette, Auteur ; P. Laure, Auteur ; Y. Demay, Auteur ; Jean-François Agassant, Auteur Année de publication : 2003 Article en page(s) : p. 171-178 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The interface instability of the coextrusion flow of a polyethylene and a polystyrene is experimentally studied with industrial and laboratory equipments for various flow rates and temperature. Stable and unstable coextrusion conditions are identified as a function of flow rate ratio, shear rate and temperature. It is found that temperature and flow rate ratio are the most relevant parameters. Experimental results are then compared with stability analysis assuming White-Metzner constitutive equations. Agreement is fair at temperatures of 180°C and 200°C. However the longwave stability analysis is not sufficient to predict all experimental data. DOI : 10.3139/217.1731 En ligne : https://drive.google.com/file/d/13SRkDUoR_qFJ2A1uIpl64sJIbmCI9xBz/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3308
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Code-barres Cote Support Localisation Section Disponibilité 001024 - Périodique Bibliothèque principale Documentaires Disponible Modelling of the plastisol knife over roll coating process / Y. Abdesselam in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 5 (11/2017)
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Titre : Modelling of the plastisol knife over roll coating process Type de document : texte imprimé Auteurs : Y. Abdesselam, Auteur ; Y. Demay, Auteur ; Romain Castellani, Auteur ; Jean-François Agassant, Auteur ; R. Peres, Auteur ; D. Gourdin, Auteur Année de publication : 2017 Article en page(s) : p. 555-561 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle
Formulation (Génie chimique)
Modèles numériques
Revêtements de sols
RhéologieIndex. décimale : 668.4 Plastiques, vinyles Résumé : The knife-over-roll coating process of plastisol formulations for flooring applications has been investigated. The coexistence of smooth spherical PVC particles and rough calcium carbonate aggregates in a Newtonian plasticizer makes this suspension a more complex system than those encountered in the literature. The shear viscosity has been measured with Couette and capillary devices in the wide range of shear rates encountered in the process, resulting in a non-monotonous viscosity curve. A numerical model based on the lubrication approximation theory allows accounting for this non-monotonous behavior. It predicts the deposited thickness, the pressure field between roll and knife and the separating force as a function of the plastisol rheology and the coating parameters.
Note de contenu : - INTRODUCTION : Bibliography - The different plastisol formulations - Modelling
- RHEOLOGY OF PLASTISOL FORMULATIONS : Rheology measurements protocol - Typical rheology curve
- MODELING OF THE COATING PROCESS : The lubrification approximations - Rheology and stress balance equations - The numerical computation
- RESULTS : Influence of the processing parameters - Influence of the plastisol formulationDOI : 10.3139/217.3422 En ligne : https://drive.google.com/file/d/1aALu3hsyR0Ww_HhL1cN5L1qEJbl4QnXE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29421
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Code-barres Cote Support Localisation Section Disponibilité 19371 - Périodique Bibliothèque principale Documentaires Disponible Numerical modeling of bubble growth inmicrocellular polypropylene produced in a core-back injection process using chemical blowing agents / José Antonio Reglero Ruiz in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 1 (03/2016)
PermalinkNumerical simulation of extrusion coating / S. Devisme in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 1 (03/2007)
PermalinkA personal perspective on the use of modelling simulation for polymer melt processing / Jean-François Agassant in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 1 (03/2015)
PermalinkPolymer processing extrusion instabilities and methods for their elimination or minimisation / Jean-François Agassant in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 3 (07/2006)
PermalinkLes principes de base de la modélisation des procédés de mise en forme des polymères / Jean-François Agassant in RHEOLOGIE, Vol. 22 (12/2012)
PermalinkRhéologie dans la zone de transition cristallisation / fusion : application à des copolymères / M. Aris-Brosou in RHEOLOGIE, Vol. 30 (12/2016)
PermalinkThe matching of experimental polymer processing flows to viscoelastic vumerical simulation / Jean-François Agassant in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 1 (03/2002)
PermalinkThe polymer film casting process - An overview / Y. Demay in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)
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