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中文摘要：
基于气体穿透机理的研究分析，精确描述气辅成型中气体穿透推进过程，将三明治成型理论应用到气辅成型中。以矩形平板型腔为例，结合Hele-Shaw流动模型，引入合理简化和假设，建立气体辅助注射成型首次气体充填过程的压力控制方程和气／液交界面运动方程，并应用无网格Galerkin法做数值模拟。得到了不同时刻气体的穿透情况以及不同节点的压力随时间的变化曲线。数值表明：三明治成型理论应用于气辅成型所建的数学模型能准确反应气体穿透推进过程，无网格Galerkin法能较好的追踪气／液界面的动态演化过程。
英文摘要：
In order to describe accurately the gas penetration behavior in gas-assisted injection molding, a theoretical study has been carried out on the transient gas-liquid interface development and gas penetration behavior in a thin rectangular cavity. A mathematical formulation based on the Hele-Shaw approximation, sandwich molding and interface kinematics and dynamics, is presented, which describes the evolution of the gas/meh interface. The implementation of the numerical simulation of the transient gas/meh interface development and pressure of different nodes at various time are fulfilled by use of Element Free Galerkin method. The results indicate that the mathematical model based on sandwich molding is effective, and the Element Free Galerkin method can trace well the gas penetration behavior.
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