| Titre : |
From virtual foam cell to finished component : Ultrasim software simulates processing of polyurethane systems |
| Type de document : |
texte imprimé |
| Auteurs : |
Matthias Wohlmuth, Auteur ; Bruno Schieber, Auteur |
| Année de publication : |
2018 |
| Article en page(s) : |
p. 36-38 |
| Langues : |
Anglais (eng) |
| Catégories : |
Mousses plastiques
Polyuréthanes
Simulation par ordinateur
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
The properties of foams are primarily determined by their reactive processing. New simulation methods with wide-ranging material models are designed both to calculate the foaming process and predict the resulting foam properties. Specific examples already show extensive correlations between simulation and practice. |
| Note de contenu : |
- Simulation of mold filling during the foaming process
- Chemical reaction and foam expansion
- Derivation of component properties from foaming simulation
- From behavior of the foam
- Simulation of mold filling behavior in the real component
- Fig. : Foaming simulation: injection of a BASF Elastoflex E foam into an open mold and the resulting filling pattern 20 s later. Based on CAD data for the finished component, the foaming simulation (red : areas of high material stress) helps to find the best possible injection path, improve the foaming position or evaluate the venting concept
- Fig. 1 : The calculated density distribution of a BASF Elastofoam I foam shows the typical density gradient for integral skin foams over the component cross section. The spatial density distribution is the decisive factor determining local stiffness and hardness in the steering wheel
- Fig.2. Representation of the simplified reaction kinetics used to describe polyurethane foaming based
- Fig. 3. Local stresses resulting from micromechanical simulation on a foam unit cell. This uses a statistical distribution of gas bubbles for a given density, with the aid of which the elastic modulus of the foam can be predicted
- Fig. 4. Filling study to validate the Ultrasim simulation model used for a steering wheel made from an Elastofoam I foam. In the simulation and actual trial, both the flow fronts and tiny air inclusions above the center spoke correlate well and confirm the material models and parameters used |
| En ligne : |
https://drive.google.com/file/d/1gycBHvUa_g34XAcxyd6C9u23VYwhVDde/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31105 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 8 (08/2018) . - p. 36-38
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