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首页> 外文期刊>Materials Research Innovations >Prediction of fiber orientation structure for injection molded short fiber composites
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Prediction of fiber orientation structure for injection molded short fiber composites

机译：注塑短纤维复合材料的纤维取向结构预测

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摘要

Structure of fiber orientation in injection molded short fiber composites is predicted by the numerical analysis. To analyze the packing stage as well as the filling stage, a compressible generalized Hele-Shaw model is adopted. A numerical scheme free from coordinate transformation is developed for three-dimensional shell-like geometry. Flow-induced fiber orientation can be predicted by solving evolution equations for the orientation tensor with a suitable closure approximation. Fibers are mainly oriented toward the flow direction near the top cavity wall due to high shear rates, while they are randomly oriented near the centerline of cavity where low shear rates prevail. Thus, the molded parts show the skin-core structure of orientation. Structure of fiber orientation continues to change during the packing stage due to additional velocity gradients - which are likely to align fibers more towards the flow direction.
机译：通过数值分析预测了注塑短纤维复合材料中纤维取向的结构。为了分析填充阶段和填充阶段，采用了可压缩的广义Hele-Shaw模型。针对三维壳状几何图形，开发了一种无坐标转换的数值方案。可以通过使用合适的闭合近似值求解定向张量的演化方程来预测流动引起的纤维定向。由于高剪切速率，纤维主要朝向顶部腔壁附近的流动方向取向，而它们却以低剪切速率占主导的腔中心线附近随机取向。因此，模制零件显示出取向的皮芯结构。由于附加的速度梯度，在填充阶段纤维取向的结构继续改变-这可能使纤维更趋向于流向。

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