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Fiber orientation in 3-D injection molded features / B. E. VerWeyst in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 4 (12/1999)
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Titre : Fiber orientation in 3-D injection molded features : Prediction and experiment Type de document : texte imprimé Auteurs : B. E. VerWeyst, Auteur ; C. L. Tucker, Auteur ; P. H. Foss, Auteur ; J. F. O'Gara, Auteur Année de publication : 1999 Article en page(s) : p. 409-420 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Molding - We present a finite element method for predicting the fiber orientation patterns in 3-D injection molded features, and compare the predictions to experiments. The predictions solve the full balance equations of mass, momentum, and energy for a generalized Newtonian fluid. A second-order tensor is used to describe and calculate the local fiber orientation state. A standard Hele-Shaw molding filling simulation is used to provide inlet boundary conditions for the detailed finite element models, which are limited to the local geometry of each feature. The experiments use automated image analysis of polished cross-sections to determine fiber orientation as a function of position. Predictions compare well with experiments on a transverse rib, where the detailed calculation can be 2-D. Results of a 3-D calculation for a flow-direction rib also show generally good agreement with experiments. Some errors in this latter calculation are caused by not simulating the initial filling of the rib, due to computational limits. Note de contenu : - GOVERNING EQUATIONS : Fiber orientation - Closure approximation - Balance equations - Stress constitutive equation - Boundary conditions
- NUMERICAL SOLUTION METHODS : Velocity, pressure, and temperature - Fiber orientation - Moving boundary
- EXPERIMENTS : Part geometry and molding conditions - Fiber orientation measurement - Material properties and boundary conditions - Results : transverse rib - Results - Flow-direction ribDOI : 10.3139/217.1568 En ligne : https://drive.google.com/file/d/1WQsqgQ4k18yOIsNHZfEBxzNbb-vITFbR/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16131
in INTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 4 (12/1999) . - p. 409-420[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001010 - Périodique Bibliothèque principale Documentaires Disponible Stretch and shape distributions of droplets with interfacial tension in chaotic mixing / T. N. Pham in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 2 (06/2005)
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Titre : Stretch and shape distributions of droplets with interfacial tension in chaotic mixing Type de document : texte imprimé Auteurs : T. N. Pham, Auteur ; C. L. Tucker, Auteur Année de publication : 2005 Article en page(s) : p. 128-135 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A numerical simulation is developed to study the time-dependent shapes of droplets in chaotic mixing, as a function of interfacial tension and droplet-to-matrix viscosity ratio. The two-dimensional, time-periodic Newtonian flow between eccentric cylinders is used as a prototype mixing flow. The microstructure is modeled as three-dimensional ellipsoidal droplets, ignoring breakup and coalescence. A Lagrangian particle method is used to follow the microstructure. When interfacial tension is small (global capillary number is large), the major axes of the droplets exhibit the same stretching statistics as passive fluid elements and droplets with zero interfacial tension in chaotic flows: the geometric average of the stretch ratio grows exponentially with time, at a rate equal to the Lyapunov exponent of the flow, while the log of the major-axis stretch of the droplets, when scaled by its instantaneous mean and standard deviation, has a time-invariant, Gaussian global distribution and a non-uniform, fractal, and time-invariant spatial distribution. In this regime the stretch of the longest droplet axis is insensitive to interfacial tension, but the shape of the cross section is very sensitive: initially spherical droplets deform first into ribbons or sheets, but eventually transform into axisymmetric threads. The larger the global capillary number, the longer the sheet morphology persists, but sheet-like structures are always transient, and the sheets relax to threads if mixing goes on too long. DOI : 10.3139/217.1880 En ligne : https://drive.google.com/file/d/1AksxJbYIFQbKwXA4QlibS3G6233xiHjr/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3072
in INTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 2 (06/2005) . - p. 128-135[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001970 - Périodique Bibliothèque principale Documentaires Disponible