Fiber orientation distribution in injection molded fiber composites has an important shell-core structure. Recently, significant theoretical orientation models, including RSC (Reduced Strain Closure), ARD (Anisotropic Rotary Diffusion), and iARD-RPR (improved ARD and Retarding Principal Rate), have been widely applied in commercial injection molding simulation software. However, there is a long-running problem requiring an urgent solution for the state-of-the-art predictive models: obvious deviation of fiber orientation was found in the core region, although the orientation in the shell layer was predicted well. According to the fiber motions of flow-induced orientation, we therefore aimed to introduce a relationship between the model parameters and the shear rate. As validation, the shear-rate-dependent parameters can effectively enhance the prior orientation results for short-glass-fiber composites and long-carbon-fiber-composites in injection molding simulations, with good agreement between the present predictions and the experimental data obtained thereby.

注塑纤维复合材料中的纤维取向分布具有重要的壳芯结构。最近，重要的理论取向模型，包括RSC（减小应变闭合），ARD（各向异性旋转扩散）和iARD-RPR（改进的ARD和延迟主速率）已广泛应用于商业注塑成型仿真软件中。但是，存在一个长期运行的问题，需要对最新的预测模型进行紧急解决：尽管对壳层的取向进行了很好的预测，但在芯区域发现了纤维取向的明显偏差。因此，根据流动引起的取向的纤维运动，我们旨在引入模型参数与剪切速率之间的关系。作为验证，