NUMERICAL SIMULATION OF RESIN FLOW IN RTM
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摘要: RTM工艺过程数值模拟对模具设计、工艺过程控制及参数优化非常重要。本文作者介绍了RTM工艺过程及特点,给出了树脂渗流控制方程,阐述了RTM工艺过程数值模拟存在的主要问题,采用贴体坐标/有限差分法和网格分区划分法模拟了模具内有插入物情形下的RTM工艺树脂渗流过程,给出了不同时刻树脂流动前沿曲线、计算网格及终止时刻压力场分布,确定了排气孔位置,计算结果与其它研究结果吻合良好。结果表明:贴体坐标/有限差分法和网格分区划分法适合解决复杂边界及可移动边界问题。Abstract: Numerical simulation of resin transfer molding is important to mold design, process control and parameter optimization. This paper introduces the RTM process and its characterizations briefly. The governing equations of resin flow are presented. Based on the exposition of main problems of the commonly used methods in modeling the RTM process, the boundary-fitted coordinate system and the finite difference method as well as the resin flow domain decomposition process are employed to simulate the RTM resin flow process in the case of mold with interior insert. The successive resin flow front position,calculating mesh and the pressure distribution at the final stage are obtained, which is helpful for locating the air vent, and good agreement is found between the results and other investigations. The results indicate that the method provided by this paper is convenient and effective in solving the moving boundary problems with irregularly geometric boundaries.
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Keywords:
- RTM /
- numerical simulation /
- boundary-fitted coordinate system /
- composite
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