[article]
| 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 rib |
| DOI : |
10.3139/217.1568 |
| En ligne : |
https://drive.google.com/file/d/1WQsqgQ4k18yOIsNHZfEBxzNbb-vITFbR/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| 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
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