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Study on the Influence of Runner and Overflow Area Design on Flow-Fiber Coupling in a Multi-Cavity System

Polymers, 2024-05, Vol.16 (9), p.1279 [Peer Reviewed Journal]

COPYRIGHT 2024 MDPI AG ;2024 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 2073-4360 ;EISSN: 2073-4360 ;DOI: 10.3390/polym16091279 ;PMID: 38732747

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  • Title:
    Study on the Influence of Runner and Overflow Area Design on Flow-Fiber Coupling in a Multi-Cavity System
  • Author: Hsieh, Fang-Lin ; Chen, Chuan-Tsen ; Hwang, Shyh-Shin ; Hwang, Sheng-Jye ; Huang, Po-Wei ; Peng, Hsin-Shu ; Jien, Ming-Yuan ; Huang, Chao-Tsai
  • Subjects: a multi-cavity system ; Aerospace industry ; Automobiles ; Coupling ; Cross flow ; Equipment and supplies ; Fiber orientation ; Fiber reinforced plastics ; fiber-reinforced thermoplastics (FRPs) ; Finite volume method ; flow–fiber coupling ; Impact strength ; Injection molding ; Mechanical properties ; Molds ; overflow area ; Polymer melts ; Polymers ; Research methodology ; Researchers ; Simulation ; Sprue ; Viscosity
  • Is Part Of: Polymers, 2024-05, Vol.16 (9), p.1279
  • Description: Fiber-reinforced composites (FRPs) are characterized by their lightweight nature and superior mechanical characteristics, rendering them extensively utilized across various sectors such as aerospace and automotive industries. Nevertheless, the precise mechanisms governing the interaction between the fibers present in FRPs and the polymer melt during industrial processing, particularly the manipulation of the flow-fiber coupling effect, remain incompletely elucidated. Hence, this study introduces a geometrically symmetrical 1 × 4 multi-cavity mold system, where each cavity conforms to the ASTM D638 Type V standard specimen. The research utilizes theoretical simulation analysis and experimental validation to investigate the influence of runner and overflow design on the flow-fiber coupling effect. The findings indicate that the polymer melt, directed by a geometrically symmetrical runner, results in consistent fiber orientation within each mold cavity. Furthermore, in the context of simulation analysis, the inclusion of the flow-fiber coupling effect within the system results in elevated sprue pressure levels and an expanded core layer region in comparison to systems lacking this coupling effect. This observation aligns well with the existing literature on the subject. Moreover, analysis of fiber orientation in different flow field areas reveals that the addition of an overflow area alters the flow field, leading to a significant delay in the flow-fiber coupling effect. To demonstrate the impact of overflow area design on the flow-fiber effect, the integration of fiber orientation distribution analysis highlights a transformation in fiber arrangement from the flow direction to cross-flow and thickness directions near the end-of-fill region in the injected part. Additionally, examination of the geometric dimensions of the injected part reveals asymmetrical geometric shrinkage between upstream and downstream areas in the end-of-fill region, consistent with microscopic fiber orientation changes influenced by the delayed flow-fiber coupling effect guided by the overflow area. In brief, the introduction of the overflow area extends the duration in which the polymer melt exerts control in the flow direction, consequently prolonging the period in which the fiber orientation governs in the flow direction (A ). This leads to the impact of fiber orientation on the flow of the polymer melt, with the flow reciprocally affecting the fibers. Subsequently, the interaction between these two elements persists until a state of equilibrium is achieved, known as the flow-fiber coupling effect, which is delayed.
  • Publisher: Switzerland: MDPI AG
  • Language: English
  • Identifier: ISSN: 2073-4360
    EISSN: 2073-4360
    DOI: 10.3390/polym16091279
    PMID: 38732747
  • Source: GFMER Free Medical Journals
    PubMed Central
    ROAD: Directory of Open Access Scholarly Resources
    ProQuest Central
    DOAJ Directory of Open Access Journals
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