塑料注射成型保压过程数值模拟

基于粘性流体力学的基本理论，通过对保压过程进行深入，细致的分析，提出了合理的假设并进行了必要的简化，建立了可压缩，非牛顿粘性流体在模具型腔中非等温流动的数学模型，选用了恰当的材料性质模型〈确一了合理的初始条件和边界条件，并采用有限元／有限差分耦合解法求解数学模型实现对保压过程的模拟，模拟结果与实验结果吻合较好。

NUMERICAL SIMULATION OF THE PACKING STAGE IN INJECTION MOLDING

In this thesis, an attempt is made to derive a mathematical model describing the packing behavior based on generalized Hele Shaw flow for a purely viscous and compressible fluid in thin cavity under nonisothermal conditions. Reasonable and necessary assumptions and simplifications are introduced after thorough and detailed analysis of the packing stage, the material properties are described accurately as well. The finite element technique is employed to treat the pressure and temperature field in the streamwise direction, however, an implicit finite difference scheme is used to obtain temperature distribution in the gapwise direction. In the end, comparision of the predicted and experimental pressure trace over the packing stage for PS is presented. The two agree quite well with each other and the accuracy of the present simulation has been verified.