Numerical prediction of flow induced fibers orientation in injection molded polymer composites
Numerical prediction of flow induced fibers orientation in injection molded polymer composites
复制标题
注塑聚合物复合材料中流动诱导纤维取向的数值预测
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
I. Mat Sahat
中科院分区：
文献类型：
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作者：
A. Oumer;N. Hamidi;I. Mat Sahat
由于注射成型过程中的充模阶段对纤维取向状态的确定有重要影响，因此对充模阶段的流场进行精确的分析就显得十分必要。本文的目的是表征短纤维在注塑模腔中的流动诱导取向状态。狗骨形模型被认为是模拟和实验。采用计算流体力学（CFD）软件MoldFlow对注塑过程充模阶段纤维取向的数值模型进行了求解。模拟和实验结果表明，两个不同的区域（或三层取向结构）横跨试样的厚度可以被发现：壳区，这是靠近模具型腔壁，和芯区的横截面的中间。模拟结果支持实验观察，薄板的概率纤维对齐的流动方向附近的模腔壁是高的，但在核心区域低。很明显，这项研究的结果可以帮助有关短纤维增强聚合物复合材料的决策。
Since the filling stage of injection molding process has important effect on the determination of the orientation state of the fibers, accurate analysis of the flow field for the mold filling stage becomes a necessity. The aim of the paper is to characterize the flow induced orientation state of short fibers in injection molding cavities. A dog-bone shaped model is considered for the simulation and experiment. The numerical model for determination of the fibers orientation during mold-filling stage of injection molding process was solved using Computational Fluid Dynamics (CFD) software called MoldFlow. Both the simulation and experimental results showed that two different regions (or three layers of orientation structures) across the thickness of the specimen could be found: a shell region which is near to the mold cavity wall, and a core region at the middle of the cross section. The simulation results support the experimental observations that for thin plates the probability of fiber alignment to the flow direction near the mold cavity walls is high but low at the core region. It is apparent that the results of this study could assist in decisions regarding short fiber reinforced polymer composites.