短玻璃纤维增强聚合物注塑充填过程及纤维取向数值模拟

基于Hele-Shaw理论及广义非牛顿流体本构方程,建立了纤维增强聚合物三维薄壁注塑成型充填阶段数学模型,根据Folgar-Tucker取向模型,建立了纤维取向张量模型。采用Moldflow对拉伸试样的注塑流动过程进行模拟,研究纤维含量f和纤维间相互作用系数Ci对纤维取向的影响。结果表明,随着Ci增大,平均纤维的取向性呈减小的趋势;试样不同部位的纤维取向不同;f对纤维取向性影响较小,且存在一个最佳含量百分比数值。

Numerical Simulation on the Filling Process and Fiber Orientation of Short Fiber Reinforced Polymer

Based on Hele-Shaw model and generalized Non-Newtonian fluid constitutive equation,a 3D mathematical model of the filling process of injection molding for thin-walled parts was established.According to the Folgar-Tucker fibers orientation model,a fiber orientation tensor model was developed.Numerical simulation examples of the flow process of injection for a tensile specimens were carried out by Moldflow.For short fiber-reinforced PP,the effect of different fibers content f and fibers’ interaction coefficienton Ci on fibers orientation was investigated.The results show that with Ci increasing,average fibers orientation decreases gradually.The degree of average fibers orientation is different in different part of tensile specimens.Fibers content f has little effect on fibers orientation and there is an optimal content.