复合材料液态成型过程中连接帽气泡形成的理论与实验模拟
Theoretical and Experimental Modelling of Bubble Formation with Connected Capillaries in Liquid Composite Moulding Processes
摘要：
LCM工艺中的空隙预测引起了复合材料行业的兴趣，因为它是一个重要的问题，以保持预期的机械性能。液体性质、预成型件几何形状和流动条件影响最终产品内部截留的空隙量。由于纤维束和纤维的排列而产生的钢筋的复杂几何形状是理解和量化这种现象的关键点。本文论述了两个简单的模型网络，它可以发生在一个织物内表示连接的毛细管，所谓的“孔隙双峰模型（PDM）”。第一个是考虑两个毛细管会聚在一个节点（T形接头），第二个是代表两个毛细管互连的供应原则。这些配置可以局部地影响流动前沿的演变。首先，在T型结器件中形成气泡的实验已经被执行和研究。在此基础上，提出了一种基于供给原理和Washburn方程的预测微孔洞和大孔洞形成的理论方法。
英文摘要：
The void prediction in LCM processes sparks off interest within the composite material industry because it is a significant issue to keep the expected mechanical properties. The liquid properties, the preform geometry and the flow conditions impact the quantity of void entrapped inside the final product. The complex geometry of the reinforcement due to the arrangement of the bundles and the fibres is a key point to understand and quantify this phenomenon. This paper deals with both simple model networks which can occur inside a fabric representing connected capillaries, so-called "Pore Doublet Model (PDM)". A first is considering two capillaries converging on a node (T-junction) and a second is representing two capillaries interconnected with a supplying principle. These configurations can affect locally the evolution of flow fronts. First, experiments of bubble formed in a T-junction device have been performed and studied. Then a theoretical approach was proposed to forecast microvoid and macrovoid formation, by taking into account a supplying principle and arranged Washburn equation in forced filling.
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