层叠单元流道对纤维取向作用的数值模拟

Numerical Simulation for Effect of Laminated Element Runner on Fiber Orientation

基于广义非牛顿流体本构方程,建立了纤维增强聚合物三维层叠单元流道注塑成型充填阶段数学模型,采用Moldex3D对短纤维增强复合材料在层叠单元流道中的注塑流动过程进行模拟,研究了层叠单元流道对纤维流动取向的影响。结果表明:入口处的纤维从开放领域进入较窄领域,取向呈随机分布状态;进入流道后,表层纤维取向度迅速提高;在接近流道出口处,纤维取向度降低,在出口截面的两侧和中间部分均出现了随机取向纤维。

Based on generalized Non-Newtonian fluid constitutive equation, a 3D mathematical model of the filling process of injection molding for laminated element runner was established. The flow process of injection for short fiber reinforced composites in laminated element runner was carried out by Moldex3D, and the effect of laminated element runner on the fiber orientation was studied. The results show that fiber orientation is scattered randomly from open field to narrow field in runner entrance; the orientation degree of surface fiber increases rapidly after entering the runner and decreases near the exit of the runner, and random orientation fiber is presented in both the two sides and the center part of outlet section.