Injection molding of short fiber reinforced thermoplastic polymer results in a preferential fiber orientation in the part, which leads to an anisotropy in the material mechanical properties. To anticipate the molded part performances, it is necessary to predict the fiber orientation pattern. Our goal is to have a practical tool that accurately predicts fiber orientation patterns, and to use that information to estimate the final product properties. Consequently, an efficient way to determine the flow induced fiber orientation for different flow cases under real injection molding conditions is presented. The proposed approach allows the average orientation angle prediction in a section by considering the close interaction between the fibers and the flow rheology, the fibers aspect ratio and the mold geometry. Finally, to validate the model, experimental data were taken with different matrices, fibers and mold geometries, where good agreements (R2 ≥ 0.8) were obtained for the fiber orientations measurements.

中文翻译：

---

短纤维热塑性生物复合材料的注射成型：纤维取向的预测

短纤维增强热塑性聚合物的注塑成型导致部件中的纤维优先取向，从而导致材料机械性能的各向异性。为了预测成型部件的性能，有必要预测纤维取向模式。我们的目标是拥有一个能够准确预测纤维取向模式的实用工具，并使用该信息来估计最终产品的特性。因此，提出了一种在实际注塑成型条件下确定不同流动情况下流动诱导纤维取向的有效方法。所提出的方法允许通过考虑纤维与流动流变学、纤维纵横比和模具几何形状之间的密切相互作用来预测截面中的平均取向角。最后，为了验证模型，