Study on the Influence of Runner and Overflow Area Design on Flow–Fiber Coupling in a Multi-Cavity System
學年 112
學期 2
出版（發表）日期 2024-05-02
作品名稱 Study on the Influence of Runner and Overflow Area Design on Flow–Fiber Coupling in a Multi-Cavity System
作品名稱（其他語言）
著者 Hsieh, Fang-lin; Chen, Chuan-tsen; Huang, Chao-tsai
單位
出版者
著錄名稱、卷期、頁數 Polymers 16(9),　1279
摘要 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 (A11). 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.
關鍵字 injection molding;fiber-reinforced thermoplastics (FRPs);fiber orientation;flow–fiber coupling;a multi-cavity system;overflow area
語言 en
ISSN 2073-4360
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 黃招財
審稿制度 是
國別 CHE
公開徵稿
出版型式 ,電子版
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