中文摘要：

建立橡胶和塑料2种熔体在矩形流道中共挤流动的三维非等温有限元模型，采用有限元法数值模拟了PA6／EPDM的共挤流动过程，研究了橡塑共挤的流动规律以及入口体积流量比与复合材料层厚比的关系。结果表明：在共挤过程中，共挤界面会倾于向熔体入口体积流量相对小、熔体黏度低的一侧偏移，同时黏度低的熔体流动速度快；入口体积流量比的减小有利于减小界面偏移和界面波动。将模拟计算得到的层厚比与实验结果进行了对比，结果表明数值模拟与实验基本一致。

英文摘要：

Three-dimensional non-isothermal finite element model of rubber melt and plastic melt co-extrusion flow in the rectangular runner was built. PA6/EPDM co-extrusion flow process was simulated by using finite element method. The flow law of rubber and plastic co-extrusion and the relation of inlet volume flow ratio and the composite material layer thickness ratio were studied. Results showed that co-extrusion interface would tend to deviate the side which volume flow was relatively small and the melt viscosity was relatively low, and the speed of low viscosity melt flow was faster. Inlet volume flow ratio of co- extrusion had a greater influence on the interface shape and position, and decreasing inlet volume flow was helpful to reduce the interface deviation and interface fluctuation. The layer thickness ratio by numerical simulation was compared with experiment results, and the result showed that numerical simulation was basically consistent with the experimental result.