Liu, Yunpu, Ren, Mengke, Li, Zheng, Gu, Junfeng, Ruan, Shilun et Shen, Changyu. 2025. « Multiscale simulation of polymer injection molding filling flow with welding line formation ». Communication lors de la conférence : CSME-CFDSC-CSR 2025 International Congress (Montreal, QC, Canada, May 25-28, 2025).
Prévisualisation |
PDF
606 - Multiscale simulation of polymer i.pdf - Version publiée Licence d'utilisation : Tous les droits réservés aux détenteurs du droit d'auteur. Télécharger (60kB) | Prévisualisation |
Résumé
This study proposes a novel multiscale simulation method integrating an improved smoothed particle hydrodynamics (SPH) method with the clustered fixed slip-link model (CFSM) to investigate the microstructure characteristics of welding and melding line defects in injection-molded polymer products. SPH enhanced with essential improvements was implemented to simulate the macroscopic filling flow in two ring-shaped cavities with different tail designs (with and without protrusion). The CFSM model was used to track the evolution of polymer chain microstructures, including entanglement density, chain orientation and re-entanglement ratio. The simulation results demonstrated that the cavity with tail protrusion reduced the welding line length and partially transformed the welding line into melding line due to flow enhanced shearing. Microscopic results demonstrated that welding line regions exhibited lower entanglement density compared to melding line, which showed higher chain orientation alignment and gradual structural transitions. The re-entanglement ratio after cessation of flow is higher in melding line, which signals higher mechanical performance compared with welding line. This is in line with realistic plastic product. These differences were attributed to shear-induced disentanglement and stretching effects near flow fronts, as well as chain relaxation after melt collision. The findings highlight that tail design can mitigate welding line defects by promoting better microstructural rearrangements, thus can improve mechanical performance as well. This multiscale framework bridges macroscopic flow behavior with microscopic polymer chain conformation, offering an insight for defect control of injection-molded products through mold design optimization.
| Type de document: | Communication (Communication) |
|---|---|
| Informations complémentaires: | Progress in Canadian Mechanical Engineering, Volume 8. Co-chairs: Lucas A. Hof, Giuseppe Di Labbio, Antoine Tahan, Marlène Sanjosé, Sébastien Lalonde and Nicole R. Demarquette. |
| Date de dépôt: | 18 déc. 2025 14:44 |
| Dernière modification: | 18 déc. 2025 14:44 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32203 |
Actions (Authentification requise)
 |
Dernière vérification avant le dépôt |