长纤维增强聚合物注塑纤维长度分布三维数值模拟

THREE-DIMENSIONAL NUMERICAL SIMULATION ON THE FIBER LENGTH DISTRIBUTION IN INJECTION MOLDING OF LONG FIBER REINFORCED POLYMER

基于Phelps-Tucker纤维断裂模型,以中心浇口圆盘为研究对象,采用Moldflow对长纤维增强聚合物注塑流动过程进行三维数值模拟,研究流动速率、熔体温度、模具温度和保压压力对纤维长度分布的影响规律,并探讨其产生的机理。结果表明,浇口附近是最长纤维和最短纤维的共存区;近壁面处纤维长度较中心层长;随着流动速率、模具温度和保压压力的增加,纤维长度均减小;随着熔体温度的增加,纤维长度先减小后增大;在近壁面处保压压力对纤维长度的影响不大。以上结果与文献对比总体吻合较好。

Based on Phelps-Tucker fiber breakage model,a center-gated disk was used for a three-dimensional numerical simulation during flow in injection molding of long fiber reinforced polymer by using Moldflow. The effects of flow rate,melt temperature,mold temperature and holding pressure on fiber length distribution were investigated,and the mechanisms were discussed. The results show that the longest and shortest fibers coexist near the gate,and the fiber length near the wall is larger than that of central layer. With flow rate,mold temperature and holding pressure increasing,the fiber length increases correspondingly. With the increase of melting temperature,the fiber length decrease first and then increase. Holding pressure near the wall has minimal impact on fiber length. These results from numerical simulation agree well with the corresponding references.