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纤维增强热塑性复合材料的流动性能导致形成不同的纤维取向结构,直接影响制件的力学性能。本文采用Moldflow软件对纤维增强热塑性复合材料在阿基米德螺旋线流动性测试模具中的注射成型进行仿真研究。研究了在不同注射压力和注射速率下,纤维含量为30%的PP材料在螺旋模具中的充填情况及纤维分布规律。分析表明:改变注射速率和注射压力对无纤维增强PP材料和纤维增强PP材料流动长度增量ΔL影响不大;试样中段纤维平均取向较好、皮芯结构不明显;在流动前端与末端纤维平均取向不佳、皮芯结构较为明显;由于惯性力的存在,螺旋流道内侧纤维取向较外侧差,在流动方向上差异呈缓慢减小并再增大的规律。在熔体流动稳定处注射压力与注射速率对纤维取向影响较小。
The flow properties of the fiber reinforced thermoplastic composites lead to the formation of different fiber orientation structures that directly affect the mechanical properties of the parts. In this paper, Moldflow software was used to simulate the injection molding of fiber reinforced thermoplastic composites in Archimedes spiral flow test mold. The filling behavior and fiber distribution of PP material with 30% fiber content in spiral mold under different injection pressure and injection rate were studied. The results show that the change of injection rate and injection pressure has no significant effect on the increase of flow length increment ΔL between PP-free PP and fiber-reinforced PP. The average orientation of the fibers in the middle section of the sample is better and the structure of the skin core is not obvious. The average orientation is not good, the core structure is more obvious; due to the existence of inertial force, the fiber orientation of the inner side of the spiral flow channel is worse than that of the outer side, and the difference in the flow direction slowly decreases and then increases. In the melt flow stability injection pressure and injection rate on fiber orientation less.