Numerical Simulation on the Void Distribution in the Fiber Mats During the Filling Stage of RTM
Numerical Simulation on the Void Distribution in the Fiber Mats During the Filling Stage of RTM
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DOI：
10.1177/073168403027992
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发表时间：
2003-11
影响因子：
3.1
通讯作者：
Chih-Yuan Chang;Ming-Sam Shih
中科院分区：
文献类型：
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作者：
Chih-Yuan Chang;Ming-Sam Shih
基于多相达西定律，通过引入饱和度的概念，建立了一个模拟RTM成型过程中单向纤维毡中孔隙分布和运动的模型。该模型考虑了两种不混溶的流体，树脂和空气，和两种类型的流动，宏观流动周围的纤维束和微观流动周围的纤维束，同时流动。结果表明，在连续填充的情况下，孔隙只在芯吸流场中形成，树脂的饱和度处处为1。空隙分布的范围取决于纤维毡的孔隙率和入口速度。通过无量纲分析，在高修正韦伯数下，毛细作用可以忽略不计，纤维毡内的饱和度分布均匀。数值模拟采用贴体有限元法。
A model based on the multiphase Darcy’s law has been developed to simulate the void distribution and movement in a unidirectional fiber mat by introducing the concept of saturation during the filling stage of RTM. The model takes into account two immiscible fluids, resin and air, and two types of flow, the macro-flow around the fiber bundles and the micro-flow around the fibers in the bundles, flowing simultaneously. Results show that the voids form only in the wicking flow field and the saturation of resin will become equal to 1 everywhere if the resin is continuously filled. The range of void distribution is dependent on the porosity of fiber mats and inlet velocity. By dimensionless analysis, the capillarity is negligible and the saturation distribution is uniform within the fiber mats at high modified Weber numbers. The numerical simulation isbased on the body-fitted finite element method.